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SHEARBRACE Featuring iLevel® Shear Braces for Engineered and Prescriptive Applications

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WALL SOLUTIONS

#TJ-8620 SPECIFIER’S GUIDE

Engineered for Performance

Designed for Safety

Built for Wood Structures

Compatible with IRC Bracing Requirements

Perfect for Narrow Wall Sections

Quick and Easy Installation with Anchor Bolt Kit

Limited Product Warranty

2006 IBC/IRC Code Accepted*

*Achieved code evaluation report recognition (ICC ES ESR-2652)

for compliance with the 2006 IBC/IRC

iLevel® Shear Brace Specifier’s Guide TJ-8620 January 2009

iLEVEL® SHEAR BRACE

The iLevel® Shear Brace (iSB) is a specially designed, prefabricated, engineered-wood panel that helps homes resist lateral forces such as those created by earthquakes and high winds. The International Residential Code (IRC) and International Building Code (IBC) require wall bracing for lateral loads in all residential structures. The iLevel® Shear Brace can help you meet these requirements efficiently and confidently with the following features:

Can be used in prescriptive specification or engineered design Narrow panel widths have high allowable loads Tall wall and multistory applications Field adjustable—can be trimmed and drilled 12" braces up to 9' tall and all 18" braces can be substituted, 1-for-1, for any

field-built, prescriptive brace panel

WHAT IS AN iLEVEL® SHEAR BRACE?

2

iLevel® Shear Brace Descriptions 2–3Kit Descriptions 4Engineered Design General Assumptions 5Allowable Design Loads— Standard Brace 6Allowable Design Loads— Braces on Raised Floor Kits 7Portal Frame Assembly 8Portal Design Information 8Allowable Design Loads— Portal Frame 9Allowable Design Loads— Stacked Shear Braces 10 Overturning Forces 11Installation Details, Trim Zones, and Allowable Holes 12Raised Floor Details 13Portal Installation Details 14Multistory Kit Installation Details 15Anchorage Embedment Depth 16Alternate Anchorage for 12" Shear Braces 16Anchor Bolt Installation 17Anchorage Details 18–19Prescriptive Specification

Wall Bracing 20How to Prescriptively Specify Braced Panels 20Prescriptive Bracing Requirements 21Prescriptive Brace Example 21Portals 22Portal Header Sizing Table 22Prescriptive Anchorage 23Alternate Anchorage for 12" Shear Braces 23

TABLE OF CONTENTS

Available Kits (see page 4 for parts list) Anchor kits: Required for all braces except braces in second story

applications.

Raised floor kits (RFK): Required when installing brace on a raised floor using detail SB8. Not required for SB9. See page 13 for details.

Portal kits: Required for brace-to-header connections.

Multistory kits (MSK): Required for stacked-brace applications.

(1) 12" Brace may only be used in first story applications. 18" and 24" braces may be used in first and second story applications.(2) 12" and 18" braces may be used as a portal brace if trimmed to a height of 78"–931/4".(3) Custom heights are available in 1⁄8" increments.

(4) Order to the nearest 1⁄8" of the required height. First-story braces in stacked applications may NOT be trimmed. If used in non-stacked applications, braces may be trimmed; 78" minimum height required for 12" and 18" braces, and 89¾" minimum height required for 24" braces.

(5) A stackable (STK) brace is required as the bottom brace in a stacked-brace application.

Available iLevel® Shear Braces

Brace(1) Width Height(2)Minimum Trimmed Height

Weight (lbs)

Portal Kit (Included

with Brace)Brace Type

iSB 12x7 12" 78" 741/2" 90 Yes PortaliSB 12x7.5 12" 851/2" 82" 95 Yes PortaliSB 12x8 12" 931/4" 89¾" 105 Yes PortaliSB 12x9 12" 1051/4" 78" 115 Standard(2)

iSB 12x10 12" 1171/4" 78" 125 Standard(2)

iSB 12x11 12" 1291/4" 78" 140 Standard(2)

iSB 12x12 12" 1411/4" 78" 150 Standard(2)

iSB 12xCustom 12" 78"–1411/4"(3) 78" Varies Standard(2)

iSB 18x7 18" 78" 741/2" 130 Yes PortaliSB 18x7.5 18" 851/2" 82" 140 Yes PortaliSB 18x8 18" 931/4" 89¾" 150 Yes PortaliSB 18x9 18" 1051/4" 78" 170 Standard(2)

iSB 18x10 18" 1171/4" 78" 185 Standard(2)

iSB 18x11 18" 1291/4" 78" 205 Standard(2)

iSB 18x12 18" 1411/4" 78" 220 Standard(2)

iSB 18xCustom 18" 78"–1411/4"(3) 78" Varies Standard(2)

iSB 18xCustom–STK 18" 931/4"–1411/4"(4) N.A.(4) Varies Stacked(5)

iSB 24x8 24" 931/4" 89¾" 200 StandardiSB 24x9 24" 1051/4" 89¾" 225 StandardiSB 24x10 24" 1171/4" 89¾" 250 StandardiSB 24x11 24" 1291/4" 89¾" 270 StandardiSB 24x12 24" 1411/4" 89¾" 295 Standard

iSB 24xCustom 24" 931/4"–1411/4"(3) 89¾" Varies StandardiSB 24xCustom–STK 24" 931/4"–1411/4"(4) N.A.(4) Varies Stacked(5)

Code Evaluation: See ICC ES ESR-2652

Brace Naming SystemiSB 18x8-STK

Stackable Nominal height (ft) Width (in.) iLevel® Shear Brace

iLevel® Shear Brace Specifier’s Guide TJ-8620 January 2009 3

iLEVEL® SHEAR BRACE DESCRIPTIONS

iSB Standard Brace Narrow wall spaces Top brace in two-story

applications Balloon framing

iSB Stackable Brace Narrow wall spaces Bottom brace in two-story

applications Multi-story installation kit

available (order seperately)

iSB Portal Brace Narrow wall spaces Garages Large windows and doors

Resists bowing, twisting, and shrinking

Easy header connections

Lower brace must be STK-designated, stackable brace

iSB Standard brace

MSK for stacked applications, includes upper holdowns

Field drillable and trimmable

Convenient access for wiring

Simple connection

Portal Shear Brace

Tall Wall Shear Brace

Stackable Shear Brace

Standard Shear Brace

Standard Shear Brace

iLevel® Shear Braces are trimmable in most

applications. See page 12 for details.


KIT DESCRIPTIONS

Anchor KitsRequired for all braces except braces in second-story applications. Kit includes two jam nuts, two double nut and washer assemblies, two bolt holders, and one anchor bolt spacer (specify width). Order threaded rod separately.

Portal KitsRequired for brace-to-beam connections. Kit includes four iLevel straps and comes standard with portal braces. Order the kit seperately if using standard braces in a portal application.

Multistory Kits (MSK)Required for stacked-brace applications. Kit includes two threaded rods (length pre-cut to match floor system depth), two holdowns with welded-on nuts, two bearing plates, two nuts, nail-gun nails, one T-plate, and three USP MP4F framing anchors. See page 15 for installation details. For use with 18" and 24" braces only.

Raised Floor Kits (RFK)Required when installing brace on a raised floor using detail SB8. Kit includes two threaded rods (length precut to match floor system depth), two steel shims, two ported couplers, one TimberStrand® LSL block with metal plates top and bottom, and one USP MP4F framing anchor. See page 13 for installation details. For use with 12" and 18" braces only.

First Floor Joist Depth

Overall Width

Available for 12" iSB



9 1/2"–16" Brace width + 3" Yes Yes No

Second Floor Joist Depth




91⁄2"–16" No Yes Yes

Anchor Bolt Spacer Length(1)

Bolt Holder Diameter

Nut Thread Size

Washer Type

121⁄8" 7⁄8" 9 UNC 2" Square/Round18" 7⁄8" 9 UNC 2" Square/Round24" 1" 8 UNC 2" Round

(1) Flat anchor bolt spacers are available in 121⁄8" and 18" lengths for CMU and Epoxy Anchor applications.

Anchor Kit Naming SystemAnchor Kit 18

Brace width (in.) Kit name

MSK Naming SystemMultiStory Kit 18x91/2

Floor joist depth (in.) Brace width (in.) Kit name

RFK Naming SystemRaised Floor Kit 18x91/2

Floor joist depth (in.) Brace width (in.) Kit name


ENGINEERED DESIGN GENERAL ASSUMPTIONS

All table values throughout this bulletin are based on concrete with f'c of 2,500 psi.

Install products according to this specifier's guide. Changes in installation methods or modification to the product and associated systems (other than those indicated in this guide) should only be made by a design professional of record. Altered installation procedures and the performance of modified products are the sole responsibility of the design professional of record.

The building shall be designed in accordance with the appropriate building code and meet local, state, and federal requirements. Verify design requirements with the local building official. Concrete foundation design remains the responsibility of the design professional of record.

iLevel® Shear Braces are part of the overall lateral-force-resisting system of the structure. The design of this system, including a complete load path necessary to transfer lateral forces from the structure to the ground, is the responsibility of the design professional of record.

Design Assumptions for iLevel® Shear Braces iLevel® Shear Braces meet the Acceptance Criteria for Prefabricated Wood Shear

Panels (ICC-ES AC 130).

iLevel® Shear Brace design values are consistent with typical wood-framed construction. Use the following values when designing:

Building Code R Ω Cd

1997 UBC 5.5 2.8 N.A.2000 IBC 6 3 4

2003 and 2006 IBC 6.5 3 4

AC130 cyclic testing in the lab.

1" anchor bolt holder and 11/2" wrench for 24" iSBs

7⁄8" anchor bolt holder and 15⁄16" wrench for 12" and 18" iSBs


ALLOWABLE DESIGN LOADS—STANDARD BRACE

Brace(2) Width HeightTotal

Vertical Load (lbs)

Seismic Design Wind Design

Allowable Shear (lbs)

Drift at Allowable

Shear (in.)

Holdown Uplift

at Allowable Shear(3)

(lbs)


Drift at Allowable

Shear (in.)

Holdown Uplift


(lbs)

iSB 12x8 12" 931/4" 4,500 905 0.38 8,440 995 0.52 9,280iSB 12x9 12" 1051/4" 4,500 790 0.43 8,315 890 0.59 9,370iSB 12x10 12" 1171/4" 4,500 605 0.49 7,095 665 0.54 7,795iSB 12x11 12" 1291/4" 4,500 545 0.54 7,045 600 0.60 7,755iSB 12x12 12" 1411/4" 4,500 485 0.59 6,850 535 0.65 7,555iSB 18x8 18" 931/4" 8,000 2,215 0.37 12,910 2,435 0.44 14,200iSB 18x9 18" 1051/4" 8,000 1,905 0.43 12,530 2,090 0.51 13,750iSB 18x10 18" 1171/4" 8,000 1,725 0.48 12,640 1,895 0.57 13,905iSB 18x11 18" 1291/4" 8,000 1,530 0.53 12,360 1,685 0.64 13,600iSB 18x12 18" 1411/4" 8,000 1,340 0.59 11,830 1,475 0.70 13,015iSB 24x8 24" 931/4" 8,000 4,435 0.37 18,800 4,880 0.42 20,685iSB 24x9 24" 1051/4" 8,000 3,905 0.42 18,680 4,295 0.47 20,550iSB 24x10 24" 1171/4" 8,000 3,325 0.47 17,720 3,660 0.53 19,505iSB 24x11 24" 1291/4" 8,000 3,010 0.52 17,685 3,315 0.59 19,475iSB 24x12 24" 1411/4" 8,000 2,695 0.57 17,305 2,965 0.64 19,035

Allowable Design Loads(1) —Standard Brace on Concrete Foundation

(1) Interpolation of design values is allowed for custom height braces. For braces less than 931/4" tall, use the values for a 931/4" tall brace.(2) 12" wide braces, 1051/4" tall and less, and all 18" wide braces are allowed in prescriptive applications.(3) Holdown Uplift at Allowable Shear is based on an assumed moment-arm equal to the brace width minus 2".

General Notes Allowable Out-of-Plane Lateral Loads table is based on:

– Braces used in a standard application with or without a Raised Floor Kit and installed according to the details in this guide.

– Wall deflection of L/240. – Header depth of 14".

Out-of-plane lateral loads consider the total vertical load.

(1) Based on 160% load duration. No further increases for duration of load are permitted.

(2) Table values based on using iLevel® Portal Kit to resist header overturning.(3) Load reduction factors: 16" deep headers = 0.88

18" deep headers = 0.78

Allowable Out-of-Plane Lateral Loads (PSF)Brace Width

Standard Brace Height8' 9' 10' 11' 12'

Attached to Double Top

Plate(1)

12" 305 210 150 110 8518" 300 210 150 110 8524" 300 210 150 110 85

Attached to Header(1)(2)(3)

12" 230 205 150 110 8518" 155 135 125 110 8524" 115 105 95 85 75

V2

V1

U C

Vertical Load

h2

h1

Vbase =OM OM =

256,050in.-lb

16,003 lbs

U C

V2 =600 lbs

V1 =1,200 lbs

Vbase =1,800 lbs

iSB 18x9 STKShear Brace

iSB 18x8Shear Brace

h2 =216.25"

h1 =105.25"

Vertical Loads (lbs)

Allowable Shear Loads (lbs)

Front View


Out-of-Plane Lateral Loads

(psf)

Side View

General Notes Allowable Design Loads table is based on:

– 160% load duration. No further increases for duration of load are permitted. – iSB height of 89¾" to 1411/4". – ASTM A449 or ASTM A193-B7 threaded rod for anchorage; 1" diameter for 24"

wide braces, 7⁄8" for all others. See page 16 for other options.


Front View

V2

V1

U C

Vertical Load

h2

h1

Vbase =OM OM =

256,050in.-lb

16,003 lbs

U C

V2 =600 lbs

V1 =1,200 lbs

Vbase =1,800 lbs


iSB 18x8Shear Brace

h2 =216.25"

h1 =105.25"

Side View

ALLOWABLE DESIGN LOADS—BRACES ON RAISED FLOOR KITS (RFK)

Brace(2) Width HeightTotal

Vertical Load (lbs)



Drift at Allowable

Shear (in.)

Holdown Uplift


(lbs)


Drift at Allowable

Shear (in.)

Holdown Uplift


(lbs)

iSB 12x8 12" 931⁄4" 4,500 815 0.47 7,600 895 0.61 8,360iSB 12x9 12" 1051⁄4" 4,500 690 0.52 7,265 760 0.66 7,990iSB 18x8 18" 931⁄4" 8,000 2,025 0.45 11,800 2,225 0.56 12,985iSB 18x9 18" 1051⁄4" 8,000 1,670 0.51 10,985 1,840 0.63 12,085iSB 18x10 18" 1171⁄4" 8,000 1,475 0.57 10,810 1,620 0.70 11,890iSB 18x11 18" 1291⁄4" 8,000 1,170 0.62 9,480 1,290 0.76 10,425iSB 18x12 18" 1411⁄4" 8,000 890 0.68 7,930 985 0.83 8,725

Allowable Design Loads(1) —Standard Brace on Raised Floor Kit

(1) Interpolation of design values is allowed for custom height braces. For braces less than 931/4" tall, use the values for a 931/4" tall brace.(2) 12" wide braces, 1051/4" tall and less, and all 18" wide braces are allowed in prescriptive applications.(3) Holdown Uplift at Allowable Shear equals the uplift generated from the shear brace plus the uplift generated from the raised floor

kit. Uplift numbers do not include any consideration of shear from the floor diaphragms; this check is the responsibility of the design professional of record. Holdown uplift at allowable shear is based on the following assumptions: Brace: moment arm = brace width minus 2". Raised Floor Kit: moment arm = RFK width minus 31/2".


– Braces used in a raised floor application installed according to the details in this guide.

– Wall deflection of L/240.


General Notes Allowable Design Loads table is based on:

– 160% load duration. No further increases for duration of load are permitted. – iSB height of 89¾" to 1411/4" (not including RFK). – ASTM A449 or ASTM A193-B7 threaded rod for anchorage; 1" diameter for 24"

wide braces, 7⁄8" for all others. See page 16 for other options.

All kits use 31/2" wide TimberStrand® LSL blocks with pre-installed steel plates.

For floor systems 91/2" to 16" deep: – RFK height = joist height + 21/4" (assuming a 11/2" sill plate and ¾" floor

sheathing) – RFK width = shear brace width + 3"

As an alternative to using the RFK, attach braces directly to concrete (as in detail SB9 on page 13). Use the Allowable Design Loads—Standard Brace on Concrete Foundation table on page 6 with this detail.

RFKs are for use only in single-story, non-portal applications.


Allowable Out-of-Plane Lateral Loads(1) (PSF)Brace Width

Standard Brace Height8' 9' 10' 11' 12'

Attached to Double Top Plate

12" 305 210 150 110 8518" 300 210 150 110 85





(psf)


PORTAL FRAME ASSEMBLY

Pre-cut hole for light fixture

Portal straps 1/2" from edges on both sides of the brace (4 straps total per brace)

Pre-cut wiring chase

Concrete design is the responsibility of the design professional

of record


Beam clear span,

8' to 18'-6"

Double Portal

Portal Header Design Header width must be 31⁄8" minimum and 51⁄2" maximum.

Header depth must be 91/4" minimum and 18" maximum.

Induced ForcesA portal frame under lateral loads causes the portal header to experience internal stresses in addition to those created by the primary loads (like gravity and wind). These additional stresses are called induced forces and must be considered when designing portal headers.

For headers with typical residential uniform loads, the induced moment and shear forces from a portal frame system do not control the design. This is due to the 160% duration of load (DOL) factor used in design and the location of the induced stresses. See ICC ES ESR-2652 for more information.

PORTAL DESIGN INFORMATION

Using Shear Braces in Portal Frame AssembliesThe portal shear braces listed in the Allowable Design Loads—Portal on Concrete Foundation table on page 9 require the brace-to-header connection detail shown throughout this guide. Increased shear capacity due to the portal acting as a system has been accounted for in the Allowable Shear values.

When designing portals using braces taller than 931/4" or wider than 18", use the Allowable Shear values from the Allowable Design Loads—Standard Brace on Concrete Foundation table on page 6. To achieve the Attached to Header values shown in the Allowable Out-of-Plane Lateral Loads tables on pages 6 and 9, braces must be attached to the header using the supplied screws and Portal Kit straps. Any alternative connections designed by a professional of record should consider shear, header overturning, and lateral out-of-plane capacities.

For Portal Installation Details, see page 14.

For drilling and trimming information, see pages 12 and 14.

Pre-cut hole for light fixture

Use one strap on each side with a minimum uplift capacity of 500 lbs per strap

Column base with a minimum uplift

capacity of 1,000 lbsPre-cut wiring chase

Concrete design is the responsibility of the design professional

of record

Beam clear span,

8' to 18'-6"


Single Portal




(psf)

Side View

ALLOWABLE DESIGN LOADS—PORTAL FRAME

General Notes Allowable Design Loads table is based on: – 160% load duration. No further increases for duration of load are permitted. – iSB height of 741/2" to 931/4". – ASTM A449 or ASTM A193-B7 threaded rod for anchorage; 1" diameter for 24"

wide braces, 7⁄8" for all others. See page 16 for other options. – Portal header clear spans of 8' (minimum) to 18'-6" (maximum). Allowable Shear and Drift at Allowable Shear are for the entire portal assembly.

Portal frame assemblies are not for use on RFKs.

For shimming and furring requirements, see details on page 14.

Portal braces may be used in 2x4 or 2x6 wall framing.

Allowable Design Loads(1)—Portal on Concrete Foundation

(1) Interpolation of design values is allowed for custom height braces. For braces less than 78" tall, use the values for a 78" tall brace.(2) 12" wide braces, 1051/4" tall and less, and all 18" wide braces are allowed in prescriptive applications.(3) Holdown Uplift at Allowable Shear is based on an assumed moment-arm equal to the brace width minus 2".

Portal Brace(2) Assembly Width Height

Total Vertical Load per

Brace (lbs)



Drift at Allowable

Shear (in.)

Holdown Uplift


(lbs)


Drift at Allowable

Shear (in.)

Holdown Uplift


(lbs)

Doub

le

iSB 12x7 12" 78" 8,000 2,730 0.29 8,520 3,000 0.31 9,370iSB 12x7.5 12" 851/2" 8,000 2,520 0.32 8,620 2,770 0.35 9,480iSB 12x8 12" 931/4" 8,000 2,310 0.35 8,620 2,540 0.39 9,480iSB 18x7 18" 78" 8,000 5,600 0.30 12,285 6,160 0.33 13,515

iSB 18x7.5 18" 851/2" 8,000 5,380 0.34 12,925 5,910 0.37 14,220iSB 18x8 18" 931/4" 8,000 5,150 0.37 13,510 5,665 0.40 14,860

Sing

le

iSB 12x7 12" 78" 8,000 1,300 0.27 8,115 1,430 0.33 8,925iSB 12x7.5 12" 851/2" 8,000 1,200 0.31 8,220 1,320 0.38 9,040iSB 12x8 12" 931/4" 8,000 1,100 0.35 8,210 1,210 0.42 9,030iSB 18x7 18" 78" 8,000 2,800 0.31 12,285 3,080 0.36 13,515

iSB 18x7.5 18" 851/2" 8,000 2,625 0.33 12,625 2,885 0.40 13,890iSB 18x8 18" 931/4" 8,000 2,450 0.36 12,855 2,695 0.43 14,140

Allowable Out-of-Plane Lateral Loads(1)(2)(3) (PSF)

Brace Width

Portal Brace Height7' 7.5' 8'

Attached to Header

12" 275 255 23018" 185 170 155


– Braces used in a portal application installed according to the details in this guide.

– Wall deflection of L/240. – Header depth of 14" in a portal system application.



(2) Table values based on using iLevel® Portal Kit to resist header overturning.

(3) Load reduction factors: 16" deep headers = 0.88 18" deep headers = 0.78

Front View

V2

V1

U C

Vertical Load

h2

h1

Vbase =OM OM =

256,050in.-lb

16,003 lbs

U C

V2 =600 lbs

V1 =1,200 lbs

Vbase =1,800 lbs


iSB 18x8Shear Brace

h2 =216.25"

h1 =105.25"




Allowable Design Loads(1) for Standard Brace in 2nd Floor, Stacked Application

Brace Width HeightTotal

Vertical Load (lbs)


Allowable Shear(2)

(lbs)

Drift at Allowable

Shear (in.)

Allowable Shear(2)

(lbs)

Drift at Allowable

Shear (in.)

iSB 18x8 18" 931⁄4" 2,000 1,235 0.43 1,420 0.47iSB 18x9 18" 1051⁄4" 2,000 1,120 0.48 1,285 0.53iSB 18x10 18" 1171⁄4" 2,000 1,000 0.54 1,150 0.59iSB 24x8 24" 931⁄4" 2,000 1,855 0.33 1,855 0.33iSB 24x9 24" 1051⁄4" 2,000 1,770 0.35 1,770 0.35iSB 24x10 24" 1171⁄4" 2,000 1,690 0.39 1,690 0.39

Allowable Reactions at Footing for Stacked Brace Applications

Brace Width

Design Category

Maximum Total Uplift

(lbs)

Maximum Base Overturning Moment

(in.-lbs)

18"Wind 23,040 368,640

Seismic 19,790 316,640

24"Wind 23,040 506,880

Seismic 21,450 471,900

Allowable Design Loads(1) for STK Brace in 1st Floor, Stacked Application

STK Brace Width HeightTotal

Vertical Load(2) (lbs)


Allowable Shear(3)

(lbs)


iSB 18x8-STK 18" 931⁄4" 4,000 2,215 2,435iSB 18x9-STK 18" 1051⁄4" 4,000 1,905 2,090iSB 18x10-STK 18" 1171⁄4" 4,000 1,725 1,895iSB 18x11-STK 18" 1291⁄4" 4,000 1,530 1,685iSB 18x12-STK 18" 1411⁄4" 4,000 1,340 1,475iSB 24x8-STK 24" 931⁄4" 4,000 4,435 4,880iSB 24x9-STK 24" 1051⁄4" 4,000 3,905 4,295iSB 24x10-STK 24" 1171⁄4" 4,000 3,325 3,660iSB 24x11-STK 24" 1291⁄4" 4,000 3,010 3,315iSB 24x12-STK 24" 1411⁄4" 4,000 2,695 2,965

(1) Based on 160% load duration. No further increases for duration of load are permitted. (2) Maximum axial load = second floor axial load (2,000 lbs) + first floor axial load

(4,000 lbs) = 6,000 lbs.(3) Interpolation of design values is allowed for custom height braces. Minimum brace

height of 931/4" required. First floor braces in stacked applications may NOT be trimmed.

General Notes The maximum reactions for footings shown on this page are based on A449

threaded rod and the information on page 16. Other footing details may change the allowable design loads and therefore require analysis by a design professional.

Stacked shear braces may not be used with a raised floor kit. Instead, use an iLevel® Shear Brace on the first floor that will extend the height of the wall and floor system. See detail SB9 on page 13.

Maximum joist depth between stacked braces is 16".

STK-designated braces are required on the first floor of stacked-brace applications.

The second floor brace must match the width of the first floor brace.

See page 15 for installation details.

ALLOWABLE DESIGN LOADS—STACKED SHEAR BRACES

(1) Based on 160% load duration. No further increases for duration of load are permitted.(2) Interpolation of design values is allowed for custom height braces. Minimum brace height of 931/4" required.

Shear capacities shown are for individual braces only. To resist forces at both upper and lower floors in a two-story application, check the shear at each floor against the maximum capacity for EACH brace.

Check the overturning moment (OM) against the maximum capacity for the system. See page 11 for an example.

OM = (V2h2) + (V1h1)

Drift Equation for Lower Braces

Δ . . . . . . . . . deflection at the top of the lower brace (in.)

h1 . . . . . . . . . lower brace height (in.)

h3 . . . . . . . . . upper brace height (in.)

V1 . . . . . . . . . applied shear load on lower brace (lbs)

V2 . . . . . . . . . applied shear load on upper brace (lbs)

Vbase . . . . . . . . V1 + V2 (lbs)

K . . . . . . . . . 15.5 x 109 for 18" wide braces 36.7 x 109 for 24" wide braces

Δ = (3V1h3 + 2Vbase h1)h12 K

V2

Vbase

h3

h1

h2V1


V2

V1

U C

Vertical Load

h2

h1

Vbase =OM OM =

256,050in.-lb

16,003 lbs

U C

V2 =600 lbs

V1 =1,200 lbs

Vbase =1,800 lbs


iSB 18x8Shear Brace

h2 =216.25"

h1 =105.25"

OVERTURNING FORCES

Given

Uncracked concrete

SDC B; Wind Speed = 100 mph (wind controls)

First story wall height = 9'; shear brace choice = iSB 18x9 STK

Second story wall height = 8'; shear brace choice = iSB 18x8

Upper brace shear, V2 = 600 lbs Lower brace shear, V1 = 1,200 lbs Shear at footing, Vbase = 1,800 lbs

Floor joist depth = 14", and the total floor depth = 14" + ¾" + 2 (11/2") = 17¾"

Solution

1 From the Allowable Reactions at Footing for Stacked Brace Applications table on page 10, the maximum base overturning moment (OMmax) is: 368,640 in.-lb.

2 Compare the shear at each brace to the maximum allowable shear for each brace shown in the tables on page 10.

Second floor brace: Allowable shear for an iSB 18x8 = 1,420 lbs > 600 lbs required. OK.

First floor brace: Allowable shear for an iSB 18x9 STK = 2,090 lbs > 1,800 lbs (1,200 + 600 lbs) required. OK.

3 Calculate the required overturning moment (OM) using the shear at each story and the story heights:

OM = (V2h2) + (V1h1) OM = (600 x 216.25) + (1,200 x 105.25) = 256,050 in.-lb.

4 Compare the allowed maximum base overturning moment (from step 1) to the required overturning moment. If the capacity is exceeded, consider adding an additional brace to the first story.

368,640 in.-lb > 256,050 in.-lb required. OK.

The stacked iSB 18x9-STK and iSB 18x8 are adequate to resist the overturning and shear forces in this example. Verify the footing requirements for the stacked shear braces. From page 16, a 28" footing that has a C3 of 14" and an of 10" is required.

Figure 1 Elevation of stacked braces, and the structural forces

developed during lateral events.

Designing for Overturning ForcesWhen specifying stacked shear brace applications, it is important to consider overturning forces. Analysis should be performed by following these steps:

1. Analyze the structure to determine the shear forces at each floor. Figure 1 illustrates the forces developed in a stacked shear brace.

2. Select an iLevel® Shear Brace for each floor, and verify that the shear capacity of the brace meets or exceeds what is required. See below for more information.

3. Calculate the system’s overturning moment and shear.

4. Compare the required forces to the iLevel® Shear Brace capacity.

Calculating the Overturning Resistance of a Stacked Shear BraceThe maximum overturning resistance provided by an iLevel® Shear Brace depends on the footing capacity, the anchor bolt capacity, and the brace capacity. For all iLevel® Shear Braces, the footing capacity controls. Concrete-footing uplift capacities are based on the footing width, the anchor bolt embedment depth, and the loading condition. See pages 10 and 16.

Vbase . . . . . . . . shear at footing

V1 . . . . . . . . . shear at the top of the first floor brace

V2 . . . . . . . . . shear at the top of the second floor brace

h1 . . . . . . . . . height to top of the first floor brace

h2 . . . . . . . . . height to top of the second floor brace

w . . . . . . . . . width of brace

OM . . . . . . . . . base overturning moment

U . . . . . . . . . uplift (tension in brace anchorage)

C . . . . . . . . . compression (compression in brace anchorage)

Design Example

V2

V1

U C

Vertical Load

h2

h1

Vbase =OM OM =

256,050in.-lb

16,003 lbs

U C

V2 =600 lbs

V1 =1,200 lbs

Vbase =1,800 lbs


iSB 18x8Shear Brace

h2 =216.25"

h1 =105.25"


INSTALLATION DETAILS, TRIM zONES, AND ALLOWABLE HOLES

Standard iLevel® Shear Brace Installation Allowable Small Holes

Allowable Large Holes for Standard and STK iSBs (in addition to allowed small holes above)

Verify brace is plumb

For trim zones, see

below

Two top plates or as specified

Threaded rod

Anchor bolt spacer

Ensure concrete is level and smooth beneath brace. Grind and fill as necessary.

Foundation system design is the responsibility of the design professional of record

Hardened nut

Washer

Holdown

SB1

SB2

SB11

Optional OSB shim, 7⁄8" maximum


OPTION B 6¾" lag screws, provided, installed from the top: 6 with 12" brace 8 with 18" brace 12 with 24" brace


Do not install screws in electrical chase

OPTION A 6¾" lag screws, provided: 6 with 12" brace (3 front, 3 back) 8 with 18" brace (4 front, 4 back) 12 with 24" brace (6 front, 6 back)

Optional OSB shim, 7⁄8" max.

Start screws 31/2" (±1/2") from bottom of double top plate or header

Countersink (1/4" deep x 1" dia.) and install at an angle that prevents screws from exiting sides of top plates or header. Offset screws 1/2" front to back to avoid interference. An installation template is available from your iLevel representative.

31/2" (±1/2")

Do not install screws in

electrical chase from either side

Trim zones Trim height from the top of the brace only. Do not trim the sides or bottom.

DO NOT trim the bottom brace in a stacked brace application.

31/2" maximum allowable trim for portal braces.

12" and 18" standard braces taller than 931/4" may be trimmed down to a minimum height of 741/2".

24" braces may be trimmed down to a minimum height of 89¾".

No holes allowed in top 8"

Minimum 12" above existing hole

FACE DRILL ZONE Center of brace face as shown

No holes allowed in top 8"

No holes allowed in lower 40" of brace

HOLES Maximum three

holes in face and three in edge

¾" diameter holes, maximum

6" o.c. minimum

HOLES 45⁄8" diameter

holes, maximum Maximum two 45⁄8"

holes or one 41/4" x 12" hole

No minimum on-center spacing required

EDGE DRILL ZONE Middle 1⁄3 of brace

thickness

FACE DRILL ZONE Maintain 11/2" min. edge distance from chase and outside edge, typical

For trim zones, see

below

Install nut finger-tight plus 1/8 turn, min.


RAISED FLOOR DETAILS

General Notes DO NOT modify the Raised Floor Kit. For floor assemblies of non-standard heights

(such as floor sheathing thicker than ¾", sill plates thicker than 11/2", or floor joists different than standard TJI® joist depths), adjust the total assembly height with steel shims or by trimming at the top of the iLevel® Shear Brace.

Place the Raised Floor Kit directly on the concrete. DO NOT place on top of the sill plate.

Attach floor joists to the RFK block using approved joist hangers. Alternatively, joists may rest on the remaining sill plate if adequate bearing is available.

Notch floor sheathing around RFK block and iLevel® Shear Brace. Support the floor sheathing with a ledger attached directly to the block or iLevel® Shear Brace (depending on elevation requirements) to accommodate vertical loads and lateral load transfer. Use connections equivalent to the floor sheathing nailing schedule.

The iLevel® Shear Brace must sit directly on the RFK top shear-transfer plate. Using compressible materials such as sheathing or wood shims in this area will affect the performance of the assembly.

RFK Interior ViewRFK Installation

Bottom shear-transfer plate (pre-attached)

31/2" TimberStrand® LSL RFK block (face grooved side to exterior of building)

7⁄8" ported coupler nut

7⁄8" diameter threaded rod

Top shear-transfer plate (pre-attached)

Steel shim

Raised Floor Kit

SB7

SB8

In-line Shear Brace

SB9

❶ Thread the ported coupler nuts and threaded rods onto anchor bolts

❷ Lower block onto threaded rods and swing bottom of block and spacer plates into place

❸ Install iLevel® Shear Brace on block

Attach USP MP4F framing anchor with 0.148" x 11/2" nails. Fill all nail holes.


Sill plate

TJI® joistRFK block

Joist hanger

Ledger

Notch floor sheathing around brace

Sill plate

TJI® joist

Joist hangerLedger

Not applicable for 24" shear braces


11/4" TimberStrand® LSL or iLevel® 11/8" rim board


Sill plate anchor bolt (per code)

Sill plate anchor bolt (per code)


11/4" TimberStrand® LSL or iLevel® 11/8" rim board

iLevel® Shear Brace sized to include the floor system height and installed directly on the foundation

11/2" minimum clearance required on each side of the anchor bolt spacer to accommodate the RFK

11/2"


PORTAL INSTALLATION DETAILS

Portal Frame Shear Brace

Portal Frame Shear Brace with 51⁄4" or 51⁄2" Wide Header(Similar for 31⁄8" header)

Portal Frame Column

Header as specified. For 51/4" or 51/2" header, use furring as required. See detail SB5 below.

Use a strap on each side with a minimum uplift capacity of 500 lbs per strap

TimberStrand® LSL portal column or solid sawn column (3" x 31/2" minimum) per the design professional of record (trim as required)

Column base with a minimum uplift capacity of 1,000 lbs


SB3 SB4

SB5

91/4"–18" deep header as specified. Center over brace width.

Portal straps (provided): Maintain 1/2" minimum edge distance. Attach with sixteen 0.148" x 23∕8" min. nails, 8 into header and 8 into Shear Brace

Minimum 21/2" x 10" furring of 7⁄8" thick OSB. Attach furring to brace with ten 0.131" x 21/2" nails. With 31⁄8" wide headers, attach furring to header.

Connect header to brace with 63⁄4" lag screws (provided): 6 with 12" brace (3 front, 3 back) 8 with 18" brace (4 front, 4 back) 12 with 24" brace (6 front, 6 back)

31/2" wide x 91/4"–18" deep header as specified. See SB5 for other header widths and allowable furring.

Portal straps (provided): Maintain 1/2" minimum edge distance. Attach with sixteen 0.148" x 23∕8" minimum nails, 8 into header and 8 into Shear Brace

Threaded rod

Anchor bolt spacer

Ensure concrete is level and smooth beneath brace. Grind and fill as necessary.

Hardened nut

Washer

Holdown



Portal Trim zone Trim height from the top of the brace only. Do not trim the sides or bottom.

31/2" maximum allowable trim for portal braces.

6¾" lag screws, provided: 6 with 12" brace (3 front, 3 back) 8 with 18" brace (4 front, 4 back) 12 with 24" brace (6 front, 6 back)

Optional OSB shim, 7⁄8" max.

Start screws 31/2" (±1/2") from bottom of double top plate or header

Countersink (1/4" deep x 1" dia.) and install at an angle that prevents screws from exiting sides of top plates or header. Offset screws 1/2" front to back to avoid interference. An instal-lation template is available from your iLevel representative.

Do not install screws in electrical chase

from either side

31/2" (±1/2")

Verify brace is plumb

Install nut finger-tight plus 1/8 turn, min.


➒ Use three USP MP4F framing anchors. Fill all holes with 0.148" x 11/2" nails.

➑ Install T-plate with 0.148" x 11/2" nails. Fill all nail holes.

11⁄8" max. floor sheathing thickness

MULTISTORY KIT INSTALLATION DETAILS

SB 10

Stackable Brace Assembly

Outside View of Connection


❷ 7⁄8" diameter threaded rod (1" dia. with 24" brace). Drill holes through double top plate for rods. Make holes ¹⁄8" larger than threaded rod.

❸ Cut 31/2" x 31/2" notches in floor-ing. Notching rim board on the inside may be required to accommodate rods.

➍ Hand tighten rod until 1¾"–2¾" remains above the sheathing

➏ Place brace over threaded rod. Install round washer and nut finger-tight plus ¹⁄8 turn, minimum.❺ Install nut, then 3" x 3" washer so that

the top of washer is flush with the top of flooring

Welded nut pre-installed on multistory holdowns

DO NOT trim lower shear brace in a stacked brace application. Maximum allowable shim is 7⁄8" thick and must be installed between the holdown brackets and the double top plate.

❶ Place holdowns on the lower shear brace. Verify that bolt-hole centers are 14" apart for 18" braces or 20" apart for 24" braces. Nail using the provided nails. Lower brace must be an

STK-designated, stackable brace

14" or 20"

➐ Install 2 layers of full-depth-and-width, solid blocking under entire width of brace. See Rimboard Detail below. Nail with 0.148" x 3" nails. Use:

– Three nails per ply on narrow section – Three rows of four nails each in

center section

Rimboard Detail

Blocking under entire width of brace

Use rim as blocking

Notching rim may be required for nut, depending on floor thickness

Notching rim may be required for threaded rod, depending on rim thickness

Locate splice as required

Threaded rod

Threaded rod diameter

+ 1⁄8"


13⁄4" (min.)

21⁄8"

Stem wallper code

Stem wall length121⁄8" min.

Anchor boltspacer

Footing

C2

C1

C3 C3

C2

Footingwidth per code

C1

13⁄4" (min.)

Stem wallper codeStem wall

8" x 18" min.

#4 rebar

#4 rebar

5" min.


Footing design by others

Anchor bolt spacer

Concretewall height

Total threaded rod assembly

length

B

B

A

A

21⁄8"

ALTERNATE ANCHORAGE FOR 12" SHEAR BRACES

ANCHORAGE EMBEDMENT DEPTHS

General Notes for Anchorage No increases for duration of load are permitted.

Appropriate for use in areas governed by IBC or IRC.

No special inspection per IBC 1704.1 or 1705.3.1 is required.

is measured from the top of the washer to the top of the footing.

Anchorage embedment is based on ACI 318 Appendix D.

Concrete assumptions: Minimum f'c of 2,500 psi; Φ = 0.85 (condition A).

For additional information, see ICC ES ESR-2652 and iLevel Shear Brace Technical Bulletin (Reorder #TB-912).

(1) Anchor bolts are ASTM A449 or ASTM A193 B7 threaded rod and are applicable for all braces and applications within this guide.(2) ASTM A307 threaded rod may be substituted in all 12" wide brace applications.(3) ASTM A307 threaded rod may be substituted for braces where the holdown uplift at allowable design shear is less than shown in the following table:

Concrete Embedment Depths and Footing Dimensions for Threaded Rod(1)(2)(3)

Application Brace Anchor Bolt Diameter

Minimum Footing Width

Embedment Depth Minimum Footing Dimensions

Wind Seismic (SCD C-E) C1 C2 C3

Uncracked Concrete

Standard or Portal Braces

iSB 12x_ 7⁄ 8" 16" 6" 7" 6" 10" 10"

iSB 18x_7⁄ 8" 16" 10" N.A. 6" 10" 10"7⁄ 8" 22" 7" 8" 9" 13" 10"

iSB 24x_1" 25" 9" N.A. 11" 14" 12"1" 28" 9" 10" 12" 16" 14"

Two-story or Stacked Braces

iSB 18x_ STK 7⁄ 8" 28" 10" 10" 12" 16" 14"

iSB 24x_ STK1" 25" 10" N.A. 11" 14" 12"1" 30" 9" 11" 13" 17" 13"

Cracked Concrete

Standard or Portal Braces

iSB 12x_ 7⁄ 8" 22" 7" 8" 9" 13" 12"iSB 18x_ 7⁄ 8" 28" 9" 9" 12" 16" 12"iSB 24x_ 1" 32" 10" 11" 14" 18" 16"

Two-story or Stacked Braces

iSB 18x_ STK 7⁄ 8" 36" 10" 13" 16" 20" 18"iSB 24x_ STK 1" 35" 10" 12" 16" 19" 16"

Anchor Bolt Diameter Wind Seismic

(SCD C-E)7⁄ 8" 15,200 lbs 11,400 lbs1" 19,900 lbs 14,900 lbs

13⁄4" (min.)

21⁄8"

Stem wallper code


Anchor boltspacer

Footing

C2

C1

C3 C3

C2


C1

13⁄4" (min.)


8" x 18" min.

#4 rebar

#4 rebar

5" min.



Anchor bolt spacer

Concretewall height


length

B

B

A

A

21⁄8"

Section A–A

Anchor Manufacturer Embedment Depth,

Anchor Bolt Spacer Required

STB28 USP 257⁄ 8" YesSSTB28 Simpson 257⁄ 8" YesSSTB34 Simpson 317⁄ 8" Yes

Alternate AnchorageFor 12" iLevel® Shear Braces

General Notes Check with manufacturer for capacities and installation instructions.

Exception: Leave 21⁄8" of anchor bolt above the anchor bolt spacer.

Not for use with masonry walls.

Minimum concrete f'c of 2,500 psi.

Place jam nut on anchor bolt 21⁄8" from the top of the bolt. Section View of Concrete Wall and FootingSection B–B

Top View of Concrete Wall and Footing

Foundation systems are the responsibility of the design professional

of record.

C3 is measured from the end of the template.


ANCHOR BOLT INSTALLATION

Attachment for 4x_ Header Attachment to Center iSB Under 6x_ Header

iLevel® anchor bolt spacer

iLevel® anchor bolt holder

Threaded rod

Double nut and washer assembly

Tie threaded rod to footing reinforcement (recommended)

To install shear brace flush to the outside face of wall, align bolt holder’s vertical faces with inside face of formwork

To install shear brace centered under 51⁄2" header or beam, align bolt holder’s grooves with inside face of formwork

Total threaded rod assembly length =

33⁄8" + + concrete wall height

Anchor Bolt Installation On the bottom end of each rod create a double nut and washer assembly by

installing a washer between two hex nuts, leaving two threads showing at the bottom.

On the top end of each rod, install a jam nut roughly 21/4" from the top. Set the anchor bolt spacer on the jam nuts.

Slide the iLevel® anchor bolt holder over the threads, flush with the end of the threaded rod, and snap it shut (invert the anchor bolt holder depending on concrete form layout).

Hand-tighten the jam nut to the underside of the anchor bolt spacer.

Nail the iLevel® anchor bolt assembly to the form edge using three nails (alignment depends on header thickness).

To better secure the assembly during concrete placement, tie the threaded rods to footing reinforcement.

Grooves

Grooves

Vertical faces

13⁄4" 23⁄4"

Vertical face

Groove

21⁄4"

11⁄4"

Anchor Bolt HolderThreaded Rod Assembly


B

B

Brace width

2" min.

#4 rebar per code or plan

Anchor bolt spacer

C3 C3

13⁄4" min.

C2C1

Jam nut below anchor bolt spacer


7⁄8" dia. (1" dia. with 24" iSB) threaded rod, grade A449 or A193 B7

Footing width

21⁄8"

11 ⁄4" top of washer to bottom of rod

3" min.coverage

, top of footing to top of washer


Concrete wall height per code or plan (not part of )


13⁄4" min.21 ⁄8"

A

A

6" curb height, typ. 6" curb height, typ.

2" (min.)

#4 rebar per code or plan3" min. coverage

3" min.coverage

Anchor bolt spacer

7⁄8" dia. (1" dia. with 24" iSB) threaded rod, grade A449 or A193 B7


C3Brace widthC3 C1

Footing widthC2


Stem wall per code

11⁄4" top of washer to bottom of rod





Portal Anchorage at Garage Curb

Concrete Foundation—Slab on Grade

General Notes For C1, C2, C3, and , see tables on page 16.



of record.

Section B–B

ANCHORAGE DETAILS


of record.

Section A–A




ANCHORAGE DETAILS


For anchorage into CMU walls, the grout strength must be 3,500 psi, minimum.

Two anchor bolt spacers are recommended: – Order flat anchor bolt spacer for CMU wall anchorage.

– Use standard anchor bolt spacer for concrete footing.

Notch bottom of shear brace (1/4" x 1" x 1") to accommodate carriage bolts.


Concrete Masonry Wall for Prescriptive Use Only (12" and 18" Braces Only)

2"min.

2"min.

D Footing width

D

le l

21⁄8"

3" min.coverage

11⁄4" top of washer to bottom of rod #4 rebar per code or plan


Anchor bolt spacer recommended

Flat anchor bolt spacer

Ported coupler, compatible with A193 B7 threaded rod, as required

1⁄2" dia. x 5" long bolt, see details above7⁄8" dia. threaded rod, grade A449 or A193 B7

Solid grouted wall section the width of the brace plus 2", min. both sides.

Use 3,500 psi grout, min.

1⁄2" min. grout clearance

12" iSB 18" iSB

Jam nut below flat anchor bolt spacer


8" min. CMU wall with 3,500 psi min. solid grout

Flat Anchor-Bolt-Spacer Bolt Locations

5"41⁄16" 5"(Use existing holes)(Use existing holes)



C3 C3 C1 C2Brace width

CMU wall height per code or plan (not part of )

CMU wall height per code or plan (not part of )

Section D–D


of record.


For a two-stage pour, a second anchor bolt spacer is recommended. See detail.


Section C–C

Concrete Foundation with Stem Wall or Basement


of record.

2" min. 13⁄4" min.

#4 rebar per code or plan Double nut and washer assembly

21⁄8"

C

C

C2

Footing widthC1

Monolithic or two-stage pour

Second anchor bolt spacer recommended for two-stage pour

Anchor bolt spacer

Ported coupler, compatible with A193 B7 threaded rod, as required

C3 C3Brace width

Stem wallper code






7⁄8" dia. (1" with 24" iSB) threaded rod, grade A449 or A193 B7

3" min.coverage

11⁄4" top of washer to bottom of rod



WALL BRACING

What is Wall Bracing?Wall bracing resists lateral (sideways) movement in a structure, and consists of a system of specially constructed wall segments tied to the roof and floor.

Prescriptive wall bracing requirements are commonly satisfied in one of four ways:

1. Construct 4'-wide wall sections of code-prescribed materials.

2. Construct narrow wall sections (at least 28" wide) of OSB (oriented strand board) or plywood and include tiedowns.

3. Use prefabricated wall sections designed to resist lateral loads.

4. Construct alternate site-built or prefabricated portal frame.

The most common panel materials used for wall bracing are 4' x 8' structural panels (OSB or plywood) or gypsum board. However, iLevel® Shear Braces are strong enough that any width of brace may replace any 4'-wide, site-built panel. Refer to section IRC R602.10 for specifics on braced wall requirements and construction methods.

Criteria for Prescriptive DesignThe following conditions must be met in order to use prescriptive methods:

Wind speeds of less than 110 mph or less than 100 mph in hurricane regions.

Seismic design category (SDC) of A through D2.

Additional restrictions apply based on loads and building geometry. See iLevel’s Conventional Construction Guide (Reorder #1502) or contact your local building official.

Some jurisdictions require an engineered design for all homes. Check with the local building official to determine if a house plan requires an engineered design or can be prescriptively specified.

Local wind speed and seismic categories can be obtained from your local building official.

HOW TO PRESCRIPTIVELY SPECIFY BRACED PANELS

1. Define the wall line to be braced. All portions of the wall line must be within 4' of the braced wall line. See page 21.

2. Calculate how many panels are required to meet the 25' o.c. spacing requirement by dividing the wall length by 25'. Always round up.

– If more than one braced wall panel is required, place the first two panels at, or near, each end of the wall line. Then place any additional braced wall panels in the remaining wall length as evenly spaced as possible.

– When a wall section does not provide sufficient length for a 4' braced wall panel, try an iLevel® Shear Brace instead.

3. Adjust the panel locations at both ends of the wall line, if required. – For exterior wall lines in SDC A–C, the distance from the end of the wall to the

nearest edge of a braced wall panel cannot be more than 12'-6".

– For exterior wall lines in SDC D0–D2, panels must be placed at the ends of the wall line. Refer to IRC R602.10.11.2 for exceptions. Note: An iLevel® Shear Brace may be located up to 8' from the end of the braced wall line in SDC D0–D2.

4. Check the percentage of bracing provided. To do this, add together the widths of all braced wall panels specified in step 2 (an iLevel® Shear Brace counts as 4' of bracing regardless of its actual width). Divide the total panel width by the wall length; then multiply by 100. – If the resulting percentage is less than that required by IRC Table R602.10.1,

add additional bracing until the result meets or exceeds the requirement.

5. If a wall line cannot meet the bracing requirements following this procedure, additional analysis may be required, or the wall line may need to be modified. Contact your iLevel representative for assistance.

Procedure

Most iLevel® Shear Braces can be counted as 4' of bracing and are a 1-for-1

substitution for site-built shear wall sections.

Exception: 12" wide braces greater than 105¼" tall


PRESCRIPTIVE BRACING REQUIREMENTS

PRESCRIPTIVE BRACE EXAMPLE

32'-0"

17'-6"1'-9"1'-9" 1'-9"

8'-6"

32'-0"

17'-6"1'-9"2'-6" 2'-6"

8'-6"

44'-4"

6'3'

9'4'

5'3'3' 2'2'2'2'8" 8"2'

3'

44'-4"

6'3'

9'4'

5'3'3' 2'2'2'2'8" 8"2'

3'

44'-4"

6'3'

9'4'

5'3'3' 2'2'2'2'8" 8"2'

3'

44'-4"

6'3'

9'4'

5'3'3' 2'2'2'2'8" 8"2'

3'

41'-10"

7'-4" 10'6' 9'4' 2'2' 1'-6"

3'

41'-10"

6' 9'4' 2'2' 1'-6"

3'

7'-4" 10'

Situation I Seismic Design Category: A Wind Speed: 100 mph

1 No portion of the braced wall line may be offset more than 4'. The offset is 3', which meets the requirements. So the braced wall line is the total wall length of 41'-10".

2 A braced wall panel is required every 25' of wall length. Find the number of panels required.

41'-10" ÷ 25' = 1.7. Rounding up, at least two panels are required.

3 Place the panels to meet the 25' spacing and the 12'-6" end distance requirements. Place one 4' site-built panel in the 9' long wall section. Position the panel on the left side of the 9' section in order to meet the end distance requirement of 12'-6" or less.

There are no 4' long wall sections available on the right side of the wall line for a site-built panel, so place one 12" iSB at the offset in the right side of the wall section. Verify that the panels meet the 25' spacing and the 12'-6" end distance requirements:

The distance between panel centers is 19'-4" 19'-4" < 25' OK The end distance for the site-built panel is 8' 8' < 12'-6" OK The end distance for the iSB is 12' 12' < 12'-6" OK

4 For SDC A, IRC Table R602.10.1 requires that at least 16% of the wall line length be braced. Find the percentage of bracing provided by adding the panel widths together and dividing by the wall length. Then multiply by 100. Remember: An iSB is equivalent to 4' of bracing regardless of its actual width.

4' + 4' = 8' (8' ÷ 41'-10") x 100 = 19% 19% > 16% OK

The braced panel layout is complete.

Situation II Seismic Design Category: Do Wind Speed: 90 mph

1, 2, and 3 same as Situation I.

4 However, for SDC D0, the panels must be at the ends of exterior wall lines. In order to meet that requirement and the 25' spacing rule, braced panels will have to be added rather than simply moved to the ends of the wall line. Therefore, add a panel at the left and right ends of the wall. Since there isn’t space for 4' panels, use two 12" iSBs. There are now four panels, and the distance between panel centers remains less than 25'.

5 For SDC D0, IRC Table R602.10.1 requires that at least 45% of the wall line length be braced. Following the same procedure as Step 4 in Situation 1:

4' + 4' + 4' + 4' = 16' (16' ÷ 41'-10") x 100 = 38% 38% < 45% NOT OK!

6 Determine how much additional bracing is needed. Multiply the percentage required by the wall length: 0.45 x 41'-10" = 19'. 19' minus the existing 16' equals 3' of additional bracing needed. One more panel will be sufficient.

7 There are two options: A) Add a second 4' braced panel in the 9' wall section. B) Add a 4' braced panel in the 4' space near the offset.

While both options meet IRC provisions, choose option B and add a braced panel near the offset.

The braced panel layout is complete.

Given

First story of a two story house.

Total exterior wall length = 41'-10".

Determine the required bracing for the wall line shown:

A B C

19'

21'

55'

28'

3'

4'

2

1

3

Braced wall panels may be offset no more than 4'

from a braced wall line

Braced panel must start within 12'-6" of the end of a braced wall

line (8'-0" for SDC D)

Site-built panels must be at least 4' long

Laying Out Braced Wall Lines and Panels in a Typical House

Legend

32'-0"

17'-6"1'-9"1'-9" 1'-9"

8'-6"

32'-0"

17'-6"1'-9"2'-6" 2'-6"

8'-6"

44'-4"

6'3'

9'4'

5'3'3' 2'2'2'2'

8" 8"2'

3'

44'-4"

6'3'

9'4'

5'3'3' 2'2'2'2'8" 8"

2'

3'

44'-4"

6'3'

9'4'

5'3'3' 2'2'2'2'

8" 8"2'

3'

44'-4"

6'3'

9'4'

5'3'3' 2'2'2'2'8" 8"

2'

3'

41'-10"

7'-4" 10'6' 9'4' 2'2' 1'-6"

3'

41'-10"

6' 9'4' 2'2' 1'-6"

3'

7'-4" 10'

Opening in wall Wall Shear Brace locations 4' site-built panel

Braced wall panels must occur at least every 25' of the braced-wall line length

Braced wall lines may be spaced up to 35' apart

Braced wall lines, typical

Wall or opening

Code-accepted braced wall panel

Identifies each braced wall line

for easier tracking


PORTALS

PORTAL HEADER SIzING TABLE

Header must be single span. Do not run headers continuous over more than one portal.

To transfer shear across header joints in prescriptive applications, use one LSTA 24 strap, minimum, (placed across the top for 91/2" deep headers) unless the header is attached to a continuous double top plate.

A minimum of 1,000 lbs of uplift capacity is required at the top and bottom of a single, portal column.

One Single and One Double Portal Three Single Portals

One Double Portal Two Single Portals

8'-0" min. 18'-6" max.

8'-0" min. 18'-6" max.

8'-0" min. 18'-6" max.

8'-0" min. 18'-6" max.

24'-0" max.

8'-0" min. 18'-6" max.

Rough opening House

width

How to Use This Table1. Determine appropriate Roof Load and House Width.

2. Locate Rough Opening.

3. Select header size and material.

Roof Load (PSF) House Width

Rough Opening9'-3" 16'-3" 18'-3"

Non-Snow Area 125%

20LL + 15DL24' 31/2" x 91/4" T M P 31/2" x 14" T M P 31/2" x 14" T M P30' 31/2" x 91/4" T M P 31/2" x 14" T M P 31/2" x 14" M P36' 31/2" x 91/4" T M P 31/2" x 14" T M P 31/2" x 16" T M P

20LL + 20DL24' 31/2" x 91/4" T M P 31/2" x 14" T M P 31/2" x 14" M P30' 31/2" x 91/4" T M P 31/2" x 14" T M P 31/2" x 16" T M P36' 31/2" x 91/4" T M P 31/2" x 14" M P 31/2" x 16" M P

Snow Area 115%

25LL + 15DL24' 31/2" x 91/4" T M P 31/2" x 14" T M P 31/2" x 14" M P30' 31/2" x 91/4" T M P 31/2" x 14" T M P 31/2" x 16" T M P36' 31/2" x 91/4" T M P 31/2" x 14" M P 31/2" x 16" M P

30LL + 15DL24' 31/2" x 91/4" T M P 31/2" x 14" T M P 31/2" x 14" M P30' 31/2" x 91/4" T M P 31/2" x 14" M P 31/2" x 16" M P36' 31/2" x 91/4" T M P 31/2" x 16" T M P 5 1/4" x 14" M P

40LL + 15DL24' 31/2" x 91/4" T M P 31/2" x 14" M P 31/2" x 16" M P30' 31/2" x 91/4" T M P 31/2" x 16" M P 51/4" x 14" M P36' 31/2" x 91/4" M P 51/4" x 14" M P 51/4" x 16" T M P

Minimum Header Size Required

T 1.55E TimberStrand® LSL M 1.9E Microllam® LVL P 2.0E Parallam® PSL

Quantity SizePanels 2 iSB 12x7, 7.5, or 8

Headers 1 See table below


Columns 1 31/2" x 31/2" x brace heightHeaders 2 See table below





24'-0" max.

8'-0" min. 18'-6" max.

8'-0" min. 18'-6" max.

8'-0" min. 18'-6" max.

General Notes


PRESCRIPTIVE ANCHORAGE

General Notes Minimum concrete f'c of 2,500 psi.

Standard holdown anchors are 7⁄8" ASTM A449 or ASTM A193-B7 threaded rod.

For 12" braces, A307-grade threaded rod may be used with the embedment lengths shown.

For 18" braces, A307-grade threaded rod may be used with the embedment lengths shown, if the brace is used in an SDC A or B application (SDC for detached houses) and in a non-stacked application.


Threaded Rod Installation To ensure the proper on-center spacing of threaded

rods or anchor bolts, use an anchor bolt spacer on a 7⁄8" jam nut. See details on page 17.

Application Loading Condition

Embedment Length(1),

(in.)Minimum

Footing WidthMinimum

C1

Minimum C2

Minimum C3

Standard or Portal Brace

Wind, SDC A–B 6" 16" 6" 10" 10"SDC C–E See Concrete Embedment Depths table on page 16

Stacked Brace

Wind 10" 28" 12" 16" 12"SDC A–B 10" 28" 12" 16" 10"SDC C–E 10" 28" 12" 16" 14"

Prescriptive Embedment Depths and Footing Dimensions

(1) Measured from the top of the footing to the top of the washer.

ALTERNATE ANCHORAGE FOR 12" SHEAR BRACES

Anchor Manufacturer Embedment Depth,

Anchor Bolt Spacer Required

STB28 USP 257⁄ 8" YesSSTB28 Simpson 257⁄ 8" Yes

Alternate AnchorageFor 12" iLevel® Shear Braces

General Notes Check with manufacturer for capacities and

installation instructions. Exception: Leave 21⁄8" of anchor bolt above the anchor bolt spacer.

Not for use with masonry walls.

Minimum concrete f'c of 2,500 psi.

Place jam nut on anchor bolt 21⁄8" from the top of the bolt.

13⁄4" (min.)

21⁄8"

Stem wallper code


Anchor boltspacer

Footing

C2

C1

C3 C3

C2


C1

13⁄4" (min.)


8" x 18" min.

#4 rebar

#4 rebar

5" min.



Anchor bolt spacer

Concretewall height


length

B

B

A

A

21⁄8"

13⁄4" (min.)

21⁄8"

Stem wallper code


Anchor boltspacer

Footing

C2

C1

C3 C3

C2


C1

13⁄4" (min.)


8" x 18" min.

#4 rebar

#4 rebar

5" min.



Anchor bolt spacer

Concretewall height


length

B

B

A

A

21⁄8"

Section A–A

Section View of Concrete Wall and FootingSection B–B

Top View of Concrete Wall and Footing

January 2009Reorder TJ-8620This document supersedes all previous versions. If this is more than one year old, contact your dealer or iLevel rep.NW

WALL SOLUTIONS

1.888.iLevel8 (1.888.453.8358)

www.iLevel.com [email protected]

2910 East Amity Road Boise, ID 83716 208.364.3600

P.O. Box 8449 Boise, ID 83707-2449

CONTACT US OUR GUARANTEE

WE CAN HELP YOU BUILD SMARTER.At iLevel, our goal is to help you build solid and durable homes by providing high-quality residential building

products and unparalleled technical and field support.

Floors and Roofs: Start with the best framing components in the industry: our iLevel® Trus Joist® Silent Floor® joists;

TimberStrand® LSL rim board; and TimberStrand® LSL, Microllam® LVL, and Parallam® PSL, headers and beams. Pull

them all together with our durable iLevel® roof sheathing and self-gapping Edge® or Edge Gold® floor panels.

Walls: Get the best value out of your framing package—use TimberStrand® LSL studs for tall walls, kitchens,

and bathrooms, and our traditional, solid-sawn lumber everywhere else. Cut down installation time by using

TimberStrand® LSL headers for doors and windows, and our iLevel® wall sheathing with its handy two-way nail lines.

Software Solutions: If you are a design professional or lumber dealer, iLevel offers a full array of software packages

to help you specify individual framing members, create cut lists, manage inventories—even help you design

whole-house framing solutions. Contact your iLevel representative to find out how to get the software you need.

Technical Support: Need technical help? iLevel has one of the largest networks of engineers and sales

representatives in the business. Call us for help, and a skilled member from our team of experts will contact you

within one business day to evaluate and help solve your structural frame problems—GUARANTEED.

Weyerhaeuser, iLevel®, Microllam®, Parallam®, Silent Floor®, Structurwood®, Structurwood Edge®, Structurwood Edge Gold®, TimberStrand®, and Trus Joist® are registered trademarks of Weyerhaeuser. © 2009 by Weyerhaeuser Company. All rights reserved. Printed in the USA.

WALL SOLUTIONS SHEAR - Matthews Building … Brace Example 21 Portals 22 Portal Header Sizing Table...

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