Chapter 3: Building Planning

2012 Virginia Residential Code Update Training

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Henrico County Department of

Building Construction and Inspections

Introduction

This presentation…

was prepared by the Henrico County Residential Building Inspection and Plan Review staff and will highlight and provide explanation for the most significant changes in the 2012 residential code.

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Questions are Welcome!!! You are probably not the only person with the same question.

Ask questions when the applicable slide is showing.

Questions & Answers will be recorded and posted on our web page.

Questions

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DPOR Certification For Contractors & Tradesmen

To receive credit towards certification renewal you must present a photo ID, your current tradesmen certificate and sign the attendance form when you enter and when you leave this seminar.

A Certificate of Attendance will be provided for your records.

Registration records will be forwarded to DPOR and will be maintained by Henrico County for 5 years as required by DPOR regulations.

Before we begin… Please turn off anything that rings, dings, sings,

clangs, bangs, buzzes or whistles Dixie

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FOLLOW-UPSDelinquent permits

Case inactive for 63 days

• Follow-up activity automatically generated

• Inspector call or site visit

• Passed follow-up inspection does not close the case Permit cancelled after 6 months of inactivity and no

violations

• Can request permit extensions in writing If final inspection has not been approved and/or

violations are not corrected a Notice of Violation will be issued

Court if Notice of Violation not satisfied

PHONE CALLS Generally not required for someone to be on site unless ACCESS is an issue

• Security

• Ladder

• Locked doors Contact phone numbers

• Not office personnel

• Someone familiar with the job Inspector time request for ACCESS purposes ONLY

• Job to be complete prior to inspection request

• AM & PM requests

• 30 minute courtesy call Water & Sewer (open ditches) and concrete placement

inspections – we will accommodate as best we can

Virginia Residential Code

In Virginia, under authority granted by law, the Statewide Building Code is promulgated by the Board of Housing and Community Development.

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Virginia Residential Code

The Virginia Residential Code (VRC) combines the 2012

IRC and the 2012 Virginia amendments in one document

The VRC is published by the International Code Council

Available from w w w. I C C s a f e . o r g

+ =

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Virginia Residential Code Comment s on the con ten t or

requ i rement s o f t he new code shou ld be d i rec ted to :

Emory Rodgers Deputy Director of Building and Fire Regulations

Dept. Of Housing & Community Development

600 East Main Street, Suite 300 Richmond, VA 23219

(804) 371-7000

[email protected]

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Chapter 1 Administration

•Effective date of the 2012 Edition of the VCC/VRC was

•July 14, 2014

•You may choose to use the 2009 referenced codes until July 14, 2015

Administration

The VRC contains provisions for Plumbing, Electrical, Mechanical, Fuel Gas and Energy Conservation

VCC Referenced Codes are Acceptable:• 2012 International Plumbing Code• 2012 International Mechanical Code• 2011 NFPA 70 (National Electrical Code)• 2012 International Fuel Gas Code• 2012 International Energy Conservation Code

Administration

Sec.108.2: Revised Exemptions from permit:

One story detached accessory structures used as tool and storage sheds, playhouses and similar uses, provided the floor area does not exceed 256 square feet and the structure are not classified as a Group F-1 or H occupancy

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Administration


• Fences of any height

• Unless they are required for pedestrian safety per VCC Section 3306

• Or are used for the barrier of a swimming pool

Administration


Concrete or masonry walls

◦ Less than 6’ in height above the finished grade

◦ Ornamental column caps are not considered to contribute to the height

Administration


Retaining walls supporting less than 3’ of unbalanced fill

◦ If Not constructed to impound Class I, II or III-A liquids (e.g., dikes for flammable liquid storage)◦ Or supporting a surcharge other than ordinary

unbalanced fill

(If supporting >48” unbalanced fill, engineered design still required)

AdministrationExempt from permit:

Temporary ramps serving dwelling units in group R3 and R5

Height of entrance served is no more than 30” above grade

Chapter 2: Definitions

Revised definitions

New definitions◦ Most significant new definitions

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Chapter 2: Revised Definitions

Attic, Habitable Basement Basic Wind Speed Combination Waste

and Vent System Flame Spread Index

(E84 or UL723)

Plumbing Fixture Riser (add definition

related to stairs) Smoke Developed

Index Story Above Grade

Plane Vapor Permeable

Membrane

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Chapter 2: New Definitions

Exterior Wall Covering Gray Water Guestroom Local Exhaust Lodging House Non-Potable Water

System Pan Flashing Performance Category Photovoltaic

Modules/Shingles

Rainwater Riser (as to stairs) Stormwater Structural Composite

Lumber Third Party

Agency/Certified/Tested Whole-House

Mechanical Ventilation System

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Attic, Habitable: ◦ Consequence of revision: If area is greater than 2/3’s of the story below

orOver 400 square feet in areaConsidered a story and is NOT permitted in dwellings or townhouses that are Three Stories above Grade Plane if designed per the Virginia Residential Code.These limits do not apply if designed per the Virginia Construction Code as R3 Construction. (requires a Sealed design, 13R sprinklers, etc.)

Significant Definitions

Habitable Attic Area Limit: 2/3’s of the story below or 400 sq ft

Grade Plane

WHOLE-HOUSE MECHANICAL VENTILATION SYSTEM.

An exhaust system, supply system, or combination thereof designed to:

Mechanically exchange indoor air for outdoor air Operates continuously or through a programmed

intermittent schedule to satisfy the new whole-house ventilation requirement.

(Covered in R303.4)

Significant Definitions

Chapter 3: Building Planning

◦ R301.2. Wind Design Maps◦ Table R301.5 Minimum Live Loads.◦ R302.2 Parapets◦ R303.4 Mechanical Ventilation◦ R308.4 Hazardous locations (glazing)◦ R310.1 Emergency Escape & Rescue Openings◦ R311 Means of Egress/

Interior Passage,Landings at Stairs

(Continued)24


◦ R314.5 Smoke Detection and Notification (Wireless Interconnection)◦ R315.2 Carbon Monoxide Detection Systems◦ R316 Foam Plastic (Thermal Barrier)

(Continued)

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Figure R301.2(4)A Basic wind speeds• The basic wind speed map has been

replaced by a new map based on the revised ASCE 7-10.

• New data indicates that the wind speeds previous editions are too conservative.

• New wind speed maps are possible because of improvements in hurricane simulation modeling.

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By the new map, no Region in Virginia is greater than 100mph.


Revised Section R301.2.1—Wind design criteria

(Change affects coastal areas)

• Deletes requirement for engineered design where the basic wind speed is ≥100 mph.

• Now allows use of prescriptive code provisions where the basic wind speed is less than 110 mph.

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Revised Section R301.2.1—Wind design criteria

Net effect of change:

• Wind design (ie, engineered design and wind borne debris resistant glazing) not required in any Virginia locality.

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• Map identifies areas where Engineered Wind Design is required

• (Now there are none in Va.)

Added Figure

R301.2(4)B)

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•Map to indicate Wind-Borne Debris Regions •Requires impact resistant glazed openings and garage doors•(None in Va. but applies in Eastern NC—OBX)

Added Fig. R301.2 (4)C

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NEW WIND BORNE DEBRIS MAP


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WIND BORNE DEBRIS MAP

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Uninhabitable attics without storage

10 psf

Uninhabitable attics with limited storage

20 psf

Footnotes b & g have been added to address where those loads apply

Table R301.5 Minimum Uniformly Distributed Live Loads

Table R301.5 Uninhabitable attic—Without Storage (note b)

b. Uninhabitable attics without storage are those where the maximum clear height between joists and rafters is less than 42 inches, or where there are not two or more adjacent trusses with web configurations capable of accommodating an assumed rectangle 42 inches high by 24 inches in width, or greater, within the plane of the trusses. This live load need not be assumed to act concurrently with any other live load requirements.

Meaning = 10 psf design live load for ceiling joist or bottom Chord of trusses.

Table R301.5 Uninhabitable attic—Limited storage (note g)

g. Uninhabitable attics with limited storage are those where the maximum clear height between joists and rafters is 42 inches or greater, or where there are two or more adjacent trusses with web configurations capable of accommodating an assumed rectangle 42 inches in height by 24 inches in width, or greater, within the plane of the trusses.

HOWEVER---


The live load need only be applied to those portions of the joists or truss bottom chords where all of the following conditions are met: 1. The attic area is accessible from an opening not less

than 20 inches in width by 30 inches in length that is located where the clear height in the attic is a minimum of 30 inches.

2. The slopes of the joists or truss bottom chords are no greater than 2 inches vertical to 12 units horizontal.

3. Required insulation depth is less than the joist or trussbottom chord member depth.

The remaining portions of the joists or truss bottom chords shall be designed for a uniformly distributed concurrent live load of not less than 10 lb/ft2.


Design for 20 psf LL

Table R301.5 Uninhabitable attic—Limited storage

Bottom chord slope ≤ 2/12

Table R301.5 Uninhabitable attic—Limited storage

R302.2.2 Parapet Exception

When using the parapet exception, openings or penetrations in the roof within 4 feet (1219 mm) of the common walls are not permitted

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R302.2.2 Parapet Exception

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R303.4 Mechanical Ventilation

If the air infiltration rate of a dwelling is less than 5 air changes per hour when tested with a blower door:

The dwelling shall be provided with whole house mechanical ventilation per M1507.3

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R303.4 Mechanical Ventilation However: Since N1102.4.1.3 limits Air Leakage to less than 5

ACPH if tested with a blower door And N1102.4.1.2.2, (Visual Inspection option)

requires whole house mechanical ventilation; Whole House Mechanical Ventilation is always

required

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Requirements have been reorganized by topic: e.g.–

Glazing in doors; Glazing adjacent to doors; Glazing in guards and railings Glazing and wet surfaces Glazing Adjacent to Stairs

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R308.4 Hazardous Locations (Safety Glazing Requirements)

Use of Safety Film in lieu of safety glazing

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R308.4 Hazardous Locations (Safety Glazing Requirements)

For new construction, safety film will not be considered as an acceptable substitute in lieu of safetglazing.

Only where changes to existing structures mandate the incorporation of safety glazing will the use of safety film be considered. Approval of safety film requires a “Request for Modification” form to be submitted with full specifications for the proposed safety film.

R308.4.5 Glazing Wet Surfaces Wording of the section has been revised.

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The exception for glazing more than 60” horizontally from the fixture does not exempt glazing in rooms containing a shower, sauna or steam room

Therefore. all glazing in walls of rooms containing a shower (including combination tub/shower) is required to be safety glazing —No exceptions.

R308.4.6 Glazing Adjacent Stairs & Ramps

A Landing at the topof stairs is no longer considered a hazardous location

Intermediate stair landings follow the hazardous location criteria for stairs

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Changed height from “less than 60 inches above…the adjacent walking surface” to

“where the bottom edge of the…glazing is less than 36 inches above the adjacent walking surface”

R308.4.6 Glazing Adjacent Stairs & Ramps

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R308.4.7 Glazing Adjacent to the Bottom Stair Landing

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R308.6.1 Tubular Daylighting Device

Adds definition for TDD’s and includes these devices under the general requirements applicable to skylights.

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R310.1 Emergency escape and rescue openings (EERO)

Now requires EERO for Habitable Attics

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R310.1 Emergency escape and rescue openings

IRC requires sill of EERO window to be no more than 44 inches from the finished floor to the bottom of the opening.

Clarification added that measurement to sill is from “finished” floor surface.

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R310.2.2 Drainage

Window wells shall be designed for: • Proper drainage by connecting to the building’s

foundation drainage system or by an approved alternative method

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Added provision for drainage of window wells.

A State amendment – Accessibility Requirements Adds requirement for minimum width of

certain doors and doorways (for accessibility)

R311.2.1 Interior Passage

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State amendment – Accessibility Requirements

If the dwelling unit has a kitchen and a living or entertainment area on the same level as the egress door:

• Interior passage must be provided to—• Kitchen, Living/Entertainment areas• At least one bedroom • At least one bathroom, containing a water closet,

lavatory, bathtub or shower.• Where provided on the same level.


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Cased openings shall provide a min. clear width of 34-inches

Doors shall be a minimum width of 34-inches (nominal)


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Exceptions:• A door or cased opening at the end

of and facing a hallway and width of hallway is not wide enough for such doors/cased openings.

• Closet doors or cased openings

• Pantry doors ” ” ”

• Doors to bathrooms accessed from a bedroom not req’d to comply with this section.


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R311.3.1 Floor Elevation at the Required Egress Door

Revised Exception: The exterior landing or floor shall not be

more than 8 1/4 inches (196 mm) below the top of the threshold.

Note: For doors other than the required egress door, R311.3.2 has not changed. A landing or floor is required within 7-3/4” of threshold.

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R311.7.6 Landing for Stairways

• The minimum width of a landing perpendicular to the direction of travel shall be--

• no less than the width of the flight served.

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• Landings of shapes other than square or rectangular shall be permitted provided:

• the depth at the walk line

• and the total area

• is not less than that of a quarter circle with a radius equal to the required landing width.

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Walkline is at 12” from the narrower edge


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Notice location of walkline

This landing is not acceptable


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Note extension of landing. This is now acceptable


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R314.1 Smoke Detection and Notification

Physical interconnection of smoke alarms is not required when there is a wireless interconnection

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R315.2 Carbon Monoxide Detection Systems

A household CO detection system is now allowed

Permanent installation Must comply with NFPA

720 & UL 2075 Monitored by an

approved supervising station

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R316 Foam Plastic

R316.4 Thermal Barrier:

If not using specific prescriptive methods (R316.5 & R316-6), this section requires separation of foam plastic from the interior of the building with a minimum ½” gypsum wallboard or other materials that meet acceptance criteria of the Temperature Transmission and the Integrity Fire Tests of NFPA 275

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R316.5.3 – # 3.7

For attics--1 ½” thick cellulose insulation has been added to the list of prescriptive ignition barriers

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R317.3.1 - R317.3.4 Fasteners for Preservative Treated Wood

Nuts and Washers now also required to be approved for contact with treated wood, wood foundations, and fire retardant treated wood

(note: ½” or greater steel bolts exempt)

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R317.3.4 Fasteners for fire retardant treated wood (interior)

Fasteners used in FRT lumber or plywood shall comply with manufacturer’s recommendations

If none are provided—Fasteners shall be in accordance with Section R317.3.3,

i.e., ◦ Hot Dipped Galvanized Steel◦ Stainless Steel◦ Silicon Bronze◦ Copper

R317.4.1 Labeling (Wood/Plastic Decking)

Wood/plastic composite deck boards, stair treads, handrails and guardrail systems shall “bear a label that indicates compliance” with ASTM D 7032 and include the allowable load and maximum allowable span ratings

AND…

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R317.4.2 Labeling (Wood/Plastic Decking)

Shall be installed in accordance with manufacturer’s instructions.

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R325 Swimming Pools Appendix G has been

deleted and all requirements related to safety enclosures for swimming pools have been moved to the International Swimming Pool and Spa Code

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Chapter 4: Foundations

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TB R403.1 Was mistakenly omitted from the text

Minimum width of Concrete Footings

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Table R403.1Minimum Width of Concrete,

Precast or Masonry Footings (inches)aLoad-Bearing Value of Soil (psf)

1500 2000 3000 ≥ 4000Conventional light-frame construction

1-story 12 12 12 12

2-story 15 12 12 12

3-story 23 17 12 12

4" brick veneer over light frame or 8" hollow CMU

1-story 12 12 12 12

2-story 21 16 12 12

3-story 32 24 16 12

8-inch solid or fully grouted masonry1-story 16 12 12 12

2-story 29 21 14 12

3-story 42 32 21 16

a. Where minimum footing width is 12 inches, use of a single wythe of solid

or fully grouted 12-inch nominal concrete masonry units is permitted.

The VRC has since added it back in through errata

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R404.1.9.2 Masonry PiersSupporting Floor Girders

• This new section provides limitations to theminimum thickness and height of masonry piers. We will look at masonry piers supporting:

- a girder only;- a girder and interior, non-loadbearing wall;- a girder and interior, load-bearing wall;- a girder and exterior, load-bearing wall;- a girder and exterior wall containing braced

wall panels;- deck girder.

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Piers supportinga girder only

Min. thickness, T , = 8”

Hollow block (must have solid top cap)

Solid block or hollow block with filled cores

Max. pier height = 4 x T


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Piers supportinga girder and aninterior,non-loadbearingwall

Min. thickness, T , = 8”

Hollow block (must have solid top cap)

Solid block or hollow block with filled cores



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Piers supportinga girder andinterior, load-bearingwallMin. thickness, T , =12”

Max. pier height = 10 feet max.Solid block or hollow block with filled cores

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Min. thickness = 12”Max. pier height = 4 feet max.

Solid block or hollow block with filled coresPiers supporting

a girder andexterior, load-bearingwall

Braced wall panels

Note: Not very tall…

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Piers have to be engineered

Piers supportinga girder andexterior wallthat contains braced wall panels

Braced wall panels

Note: This is not a new change

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Piers supportinga deck girder

Note: This is not a new change

Follow requirements of R404.1.9

R405 Foundation Drainage

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R405.1 Concrete or Masonry Foundation Drainage

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• Perforated drains shall be surrounded by an approved filter membrane (“sock”) ORan approved filter membrane must cover a minimum of 6” of gravel/rock covering the drain.

R405.1 Concrete or Masonry Foundation Drainage

92ORMin. 12 in.

Chapter 5: Floors

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The section would have required you to protect the underside of your floor joist inthe crawlspace with ½” gypsum or equivalent.

Before we begin…

What you should know…

This section may become code in the next code cycle.

R501.3 Protection of Floors

This section appears in your code book, butthis requirement was recently DELETEDby the State after the book’s printing. Thus, it’s not a new change in the 2012 VRC.

Floor Joist Span TablesR502.3.1(1) and R502.3.1(2)

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• Maximum spans for Southern Pine floor joist have been reduced.

2x6 @ 16” O.C.

2x8 @ 16” O.C.

2x10 @ 16” O.C.

2x12 @ 16” O.C.

9’-9” 12’-10” 16’-1” 18’-10”

In VRC 2009, SP #2 joist spans (living areas-40 psf live load) were as follow:

In VRC 2012, SP #2 joist spans (living areas-40 psf live load) are as follow:

2x6 @ 16” O.C.

2x8 @ 16” O.C.

2x10 @ 16” O.C.

2x12 @ 16” O.C.

9’-4” 11’-10” 14’-0” 16’-6”

Why????

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• Recent testing of Southern Pine lumberhas revealed that it’s not as strong as it used to be (namely because of the way the newer pines have been grown versus older pine forests).

What you should know…

• The Southern Pine headers, beams, cantilevered joists, and balcony joists that appear on your plans may no longer be structurally sufficient!

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• Consult your building designer to see if your #2 Southern Pine lumber is being usedadequately on your plans. If not, thenincrease the header/beams etc. accordingly.

• The header and beam tables that appear in Chapter 5 are of no help, since they only specify #1 Southern Pine in the tables. (Typically, we see #2 Southern Pine used in the field). The same can be said for the cantilevered joist and balcony joist tables in this chapter.

What you should do…

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• If you are using lumber other than #2 Southern Pine, then please specify what type and grade of lumber you will be using on your plans. Otherwise, we will assume #2 Southern Pine when we review the plans.

• The floor joist tables, however, do include #2 Southern Pine, so check your joist spans on the plans and either increase the joist size or joist spacing accordingly.

R507 - Decks

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R507 - Decks

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NOTE:

This new section on decks is an attempt bythe VRC to give you a fairly comprehensive,from-start-to-finish guide on how to build decks.

The requirements deserve your serious attention.

R507 - Decks

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• New joist span and beam span tables for wet service conditions, such as decks, using 40 psf live load (Table R507.5 & Table R507.6)

2x6 @ 16” O.C.

2x8 @ 16” O.C.

2x10 @ 16” O.C.

2x12 @ 16” O.C.

9’-9” 12’-10” 16’-1” 18’-10”

In VRC 2009, SP #2 joist spans were as follow:

In VRC 2012, SP #2 joist spans (wet service) are as follow:

2x6 @ 16” O.C.

2x8 @ 16” O.C.

2x10 @ 16” O.C.

2x12 @ 16” O.C.

9’-0” 11’-10” 14’-0” 16’-6”

R507 - Decks

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• New deck-to-house attachment detail and table for placement of lag screws/bolts.

(TB R507.2.1, Fig R507.2.2(1) & (2)

This table and figure has SERIOUS implications…

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There’s not much room to place your fasteners…

Door

Bottom bolt/screwlocation requirement

And how much of a step-down can I have from the top of the subfloor to the top of the decking???

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Door

* Max. step down height =

• Implications of Table R507.2.1 / Figure R507.2.1 (1)

* measured from top of ¾” subfloor to top of 5/4” decking

¼”2x10bandjoist

2x10ledger

6 ½”

2x10 band joist / 2x10 ledger EXAMPLE

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Door

* Max. step down height (using the 5 ½” bottom bolt location) =



1 ¼”2x10band joist

2x8ledger

5 ½”

2x10 band joist / 2x8 ledger EXAMPLE (w/ 5 ½” bottom bolt location option)

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Door

* Max. step down height (using the 4 ½” bottom bolt location) =



2 ¼”2x10band joist

2x8ledger

4 ½”

2x10 band joist / 2x8 ledger EXAMPLE (w/ 4 ½” bottom bolt location option)

2x12 Cannot be done

2x12 2x8 w/ 5.5” bolt option 3 ¼”

2x8 w/ 4.5” bolt option 4 ¼”

2x10 2 ¼”

2x12 1 ¼”

* measured from top of ¾” subfloor to top of 5/4 decking surface107


Ledger Band Joist *Maximum step down

2x8 2x8 w/ 5.5” bolt option Cannot be done

2x8 w/ 4.5” bolt option ¼”

2x10 Cannot be done

2x12 Cannot be done

2x10 2x8 w/ 5.5” bolt option 1 ¼”

2x8 w/ 4.5” bolt option 2 ¼”

2x10 ¼”

Step Down Height Limitations

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Implications: Table R507.2.1/Figure R507.2.1 (1)

- A min. 2x8 ledger board is required. (Note: 2x6 joists may still be used)

- Where a ledger/band joist step down “cannot be done”, another type of deck support must be used (see next slide).

- Bolting to or through the sill plate is NOT permitted.

- Placing a bottom bolt to or through the foundation wall while placing the top bolt through the band joist is NOT permitted.

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What kind of deck support can I use in lieu of Table R507.2.1 / Figure R507.2.1(1)???

- Build a free-standing deck.

- Bolt the ledger through the foundation wall with amanufacturer’s epoxy and bolt system (for hollow walls) or expansion anchor (for solid walls), provided that the manufacturer’s specs have been approved by the County and installed per manufacturer’s specifications.

- Use a manufacturer’s ledger screw product, provided that the manufacturer’s specs have been approved by the County and installed per manufacturer’s specifications.

R507 - Decks

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• New max. post heights table (Table R507.8)

• New Fig. R507.7.1 gives two options for connecting the deck post to the deck beam (see next slide )

Deck Post Size Max. Height of Post(from beam to ground)

4x4 8 feet4x6 8 feet6x6 14 feet

R507 - Decks

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Option #1: Notched Post

2 ½” min.

(2) ½” dia. through-boltswith washers

5 ½”min.

**Approved Post Cap

Option #2: Post Cap

NOTE: These two connection details are theONLY post-to-beam connections permitted for decks.

** Simpson BC4or USP C44

R507 - Decks

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6” min.

Approved connector required for these two options (Simpson

ABA, ABW, ABU series orUSP PA, PAU series)

The code gives you four deck footing options:

12” min.

Observe these clearances for thisoption

R507 - Decks

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Typical post-to-footing connection for the firsttwo options on the previous slide.

Chapter 6: Wall Construction

• Bearing stud wall height limitations• Fastener schedule for structural

members• Single member header construction• King studs adjacent to headers• Overview of wall bracing changes• Window sills

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Table R602.3.1 has been removed

Where did it go?

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Table R602.3.1 was a table that gave you a load-bearing, tall wall option BUT with severe limitations that one would discover by readingthe tiny footnotes at thebottom.

This table was often misinterpreted due to the limitations.

Where did it go?

116

Table R602.3.1 has now been summarizedinto one statement:

R602.3.1 Exception 2 –

When a stud wall is supporting only 6 feetor less of roof tributary load, the max. height of a 2x6 stud wall permitted is 18 feet (with studs spaced @ 16” O.C.); or 20 feet (with studs spaced @12” O.C.)

Where did it go?

117

Load-bearing wall height limitations

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The table below summarizes all of the max. height conditions of for bearing and non-bearing walls.

Bearing wall condition Max. stud wall height, min. stud size

Load-bearing wall when “Practical” (formerly, “Simplified”) wall bracing used

10 feet, (stud size/spacing per Table R602.3(5))

Load-bearing wall when “Classic” wall bracing used

12 feet, (stud size/spacing to be per R301.3 and Table R602.3(5) and total req. length of bracing in Table

R602.10.3(1) is increased by a factor or 1.10)

Load-bearing wall when any wall bracing used and max. roof trib. length of 6 feet.

18 feet (using 2x6 studs @ 16” O.C); OR

20 feet (using 2x6 studs @ 12” O.C.)

Non-bearing wall Per Table R602.3(5)

Item # 5: Roof truss to plate: 3- 16d nails (2 toenails on 1 side and 1 toe nail on opposite side of truss).

Item # 26: Blocking to sill plate: 8d nails @ 6” O.C.

Footnote “j”: Rafter to ceiling joist: Where rafter isfastened to an adjacent parallel ceilingjoist, provide 2 toe nails on one side ofrafter and toe nails from ceiling joist totop plate, according to the Table.

Table R602.3(1) Fastener Schedule for Structural Members

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R602.7.1 Single Member Headers

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• Single member headers may now be constructed per either of the two figuresshown below. Note that the air void must be filled with insulation or wood material perN1102.4.

Fig. R602.7.1(1) Fig. R602.7.1(2)

Void needs to be filled

Table R602.7(1) Single MemberHeader Table

121

• Like before, the only Southern Pine option you’re given is #1 grade, so the table is of no help if you’re building with #2.

• Again, check with your building designer if you want to use single, # 2 Southern Pine headers.

R602.7.4 Supports for headers

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• A king stud shall be adjacent to the jack stud on each end of the header and nailed with 4-12d nails.

R602.10 “Classic” Wall Bracing

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Good NEWS! No new changes!

Except for one thing…

The wall bracing plan and calculations for upper floors will not be required when the cumulative length of wall openings of each upper floor wall is less than or equal to the cumulative length of the openings of the wall directly below it.

R602.10 “Classic” Wall Bracing

124

First Floor Plan Second Floor Plan

If this option is chosen, please pencil in the total wall openings of each floor for us so that we’ll know not to look for the wall bracing plan and calculations for the upper floor(s).

Other than that, keep up the good work!

15 ft 9 ft

7 ft 3 ft

9 ft 6 ft8 ft

No design or calcs. req.for second floor

10 ft

R602.12 “Practical” (formerly “Simplified”) Wall Bracing

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- Multiple circumscribed rectangles may be used on one house.

- Bracing units “BU” are no longer used.Actual wall widths will now be used for braced wall panels.

• Summary of changes

- Restrictions have been removed to allow for the “Practical” method to be used for most houses.

R602.12 “Practical” (formerly “Simplified”) Wall Bracing

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• A complete summary of changes ison a handout in the rear of the room.

If you are interested in attending a“Practical” wall bracing class, pleasesign your name on the sign-up sheet at the rear of the room atthe end of this presentation.

Window sill codes have been relocated in the IRC 2012 code.

IRC 2009 IRC 2012- Window sills R612.2 R312.2.1

- Window fall prevention R612.3 R312.1devices

- Window opening R612.4 R312.2.2limiting devices

Where did it go?

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Chapter 7: Wall Covering

• Masonry anchorage• Brick veneer tie spacing• Flashing of exterior doors and windows• Adhered masonry veneer clearances

and flashing requirements

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Chapter 7: Wall CoveringsReminder:Masonry veneer can not support any other building loads other than it’s own weight.

This means that youcannot attach rafters or ceiling joists to masonry veneer.

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R703.7.4.1 Size and spacing of veneer ties to stud wall

Veneer ties can now be spaced32” O.C. horizontally (as opposed to 24” O.C.). Vertical ties are still to be spaced at 24” O.C.

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R703.8 #1 Flashing (for exteriorwindow and door openings)

Flashing for exterior windowand door openingsis to be installedper themanufacturer’sinstallation and flashing instructions.

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R703.8 #1 Flashing (for exteriorwindow and door openings)

Where flashinginstructions ordetails are not provided, panhead, and side flashing mustbe installed perR703.8.

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R703.12 Adhered masonry veneer

R703.12.1 Clearances

New specific clearancerequirements for adheredstone on exterior stud walls.

Adhered stone needs to be:

1) Min. 4” above the earth;2) Min. 2” above paved areas;

or3) Min. ½” above exterior

walking surfaces that are supported by the same foundation that supports the exterior wall (ie. raised concrete porches).

1) Min. 4” above the earth;

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R703.12 Adhered masonry veneer

R703.12.1 Flashing atfoundation

New specific flashingrequirements for adheredstone at the foundation.

A screed or flashing (0.019” thick or 26 ga.) with a min.vertical attachment flange of3 ½” shall be installed toextend a min. 1” belowthe foundation plate line onexterior walls. The water-resistive barrier shall lap overtop of the attachment flange.

Chapter 8 Roof-Ceiling Construction

135

Section R802.1.2 End-jointed lumber

Same as Section R502.1.3.

HRA grade mark required if part of an assembly

Changes in Chapter 8 Roof-Ceiling Construction

A new figure is added to clarify the application. An actual dimension of 3½ inches replaces a nominal 4-inch dimension in describing the portion of rafter remaining after notching at the wall top plate.

Section 802.7.1.1Cantilevered Portions of Rafters

Figure R802.7.1.1 Rafter Notch

For SI: 1 inch = 25.4 mm.

This new section adds the provisions for the limits for taper cuts on the ends of ceiling joists. A new figure was added to aid in determining the correct application of ceiling joist taper cut requirements.

Section R802.7.1.2 Ceiling joist taper cut

Exception 2 now requires that no less than 40 percent and no more than 50 percent of the required ventilating area be located in the upper portion of the attic or rafter space no more than 3 feet below the ridge or the

highest vertical point of the space.

Section R806.2 Minimum vent area

The provisions for reducing the minimum net free ventilating area from 1/150 of the area to

1/300 of the area have been revised:

This was previously no less than 50 and no more than 80 percent

Revised to add text that clarifies that the unvented attic provisions also apply to rafter assemblies typically used for vaulted or cathedral ceilings.

A new sentence (Condition 5.4) clarifies that insulation board installed as an air-impermeable barrier must have the edges sealed to provide a continuous barrier.

Section R806.5 Unvented attic and unvented enclosed rafter

assemblies

Chapter 9: Roof Assemblies

144

Flashing against a vertical sidewall may be continuous or step method

R905.2.8.3 Sidewall Flashing

Chapter 10: Chimneys/Fireplaces

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R1001.8: Masonry Fireplace Smoke Chamber

When the inside surface of the smoke chamber is formed by corbelled masonry it shall be parged smooth with medium-duty refractory mortar conforming to ASTM C 199.

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Chapter 11: Energy Efficiency

148

Wall Insulation R-Value –◦ R-15 cavity insulation ◦ or R-13 cavity + R-1 continuous insulation

Sky light U factor .55

Solar Heat Gain Coefficient required on window labeling – Max. 0.40

Table N1102.1.1 (R402.1.1)Changes to

“Insulation and Fenestration Requirements by Component”

Table

Section N1102.2.4: Access Hatches and Doors

• Weather-stripped• Hinged vertical doors R-5 • Hatches and scuttle holes

are to be insulated to the R value of the surrounding surface

Pull down stairs shall have a minimum 75% of the panel area insulated with rigid R-5

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Section N1102.2.4: Access Hatches and Doors

If you use loose fill insulation to meet the insulation requirements, a wood frame or equivalent baffle or retainer is required to retain insulation in place

The device must prevent spilling of insulation into the living area and provide a permanent means of maintaining the required R value

Building envelope air tightness shall be determined by one of two options:

1. N1102.4.1.2.1 Testing Option: Tested air leakage is less than 5 ACH when tested with a blower door at a pressure of 50 pascals (.007 psi)

2. N1102.4.1.2.2 Visual Inspection Option : Air barrier and insulation table.

Either option now requires a whole house mechanical ventilation system

per M1507.3.

Section N1102.4.1.2: Air Sealing

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The air barrier for knee walls is required to be sealed.

Table N1102.4.1.1

Appendix G: Swimming Pools

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Appendix G: Replaced by ISPSC

International SwimmingPool and Spa Code

Covers all non-electrical requirements for public and private swimming pool and spas.

(Additional training offered at a later date)

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Questions?

156

Questions & Answers:

From Classroom

Discussion

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Chapter 3: Building Planning

Documents

Transcript of Chapter 3: Building Planning