TH PermaBase BRAND Cement Board Construction Guide … · PERMABASE® BRAND CEMENT BOARD ... should...

PermaBase®

BRAND

Cement BoardConstruction Guide

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®

145

12TH EDITION

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PERMABASE® BRAND CEMENT BOARD

PermaBase® BRAND CementBoard is a rigid substrate madeof Portland cement, aggregateand glass mesh that provides anexceptionally hard, durable sur-face that is able to withstand pro-longed exposure to moisture.PermaBase offers a competitiveadvantage over similar prod-ucts on the market with itspatented EdgeTech® technology.The tapered, double-wrappededge design allows for closernail or screw application to theedge.

� Double-wrapped edge withEdgeTech technology allowsfor closer fastener applica-tion of nails or screws at theedge without crumbling orspinout.

� IRC and IBC 2006Compliant – Meets ASTM C1325.

� PermaBase resists thegrowth of mold and mildewachieving a panel score of10, the highest score possi-ble, per ASTM D 3273.*

� Homogeneous core hasfewer voids and provides avery easy and clean scoreand snap.

� Can be cut utilizing a stan-dard utility knife andstraightedge. WithPermaBase’s unique corecomposition, little or noadditional labor is needed toclean the edge after a cut.

� PermaBase is impact resis-tant, extremely durable anddimensionally stable. It hasexcellent overall flexural,compressive and tensilestrength characteristics.

� PermaBase is highly mois-ture resistant, and will notrot, disintegrate or swellwhen exposed to water.

� 1/2" PermaBase may beused in 1 hour and 2 hourrated assemblies and is ULClassified.

� PermaBase has a smoother finish than other brands andhas no open edges, whichreduces hand chafing.

� 1/4" PermaBase is ideal forremodeling applicationsbecause it can be applieddirectly over a variety ofexisting countertop surfaces.

� As a floor underlayment 1/4"PermaBase eliminates theneed to modify adjacentthresholds when abutting tocarpeting, wood flooring andother common flooringmaterials.

� Lowest water absorption ofany cement board per ASTMC 473.

� Can be used in residentialand commercial saunas andsteam rooms.

� Available in various widths,lengths and thicknesses.

� Can be used in 24" o.c.floor truss construction, withspecific requirements.

� Suitable for both interiorand exterior applications.

A. Double-wrapped edge with EdgeTech®

technology

B. Fiberglass mesh

C. Cementitious core

AB

C

GridMarX®

1/4" PermaBase Underlayment has GridMarX, a pre-printed fastening pattern that ensures the proper number of fastenerswhile taking the guesswork out of spacing, layout and trim-ming.

*When tested by an independent laboratory per ASTM D 3273 ("Standard Test Method for Resistance to Growth of Mold on the Surface of Interior Coatings in an Environmental Chamber"),PermaBase achieved a panel score of 10, the highest score possible, indicating no mold growth under the laboratory test conditions. The use of PermaBase in actual installations may not producethe same results as were achieved in controlled laboratory conditions. No material can be considered "mold proof," nor is it certain that any material will resist mold indefinitely.


DESCRIPTION

FEATURES/BENEFITS

147

CEMENTITIOUS BACKERUNIT (CBU): PermaBaseCement Board is a nailable,screwable backerboard andunderlayment panel which iscomposed of Portlandcement, aggregates and rein-forcements that has a signifi-cant ability to remain unaf-fected by prolonged exposureto moisture. PermaBase com-plies with ASTM C 1325 andANSI A118.9.

JOINT REINFORCEMENT:PermaBase mesh tape mustbe used on all edges and cutsmade to size. Use 2" widepolymer-coated (alkali resis-tant) mesh tape for interiorapplications and 4" widepolymer-coated (alkali resis-tant) mesh tape for exteriorapplications.BONDING MATERIALS: Treatjoint and set facing materialpreferably with latex-Portlandcement mortar or with dry-set(thin-set) mortar. All mortarsshould comply with ANSIA118.1 or A118.4 standards.Type 1 organic adhesive meet-ing ANSI A-136.1 may be uti-lized for interior use only.FASTENERS: Galvanized roof-ing nails, 1-1/2" long with hotdipped galvanized coating, foruse with wood framing. Nailsshould meet FederalSpecification #FF-N105B/ type2 style 20.PermaBase corrosion resistantscrews or equivalent, 1-1/4" or1-5/8" long, for use with woodframing. Type S-12 screws orequivalent, 1-1/4" or 1-5/8"long, for use with 20 ga. orheavier steel framing.

� 30-year limited warranty forinterior applications.

� 10-year limited warranty forexterior applications.

� Joints should be treated withalkali resistant fiberglassmesh tape set in a latex-Portland cement mortar.

� Conventional paper drywalltape, joint compound anddrywall nails or screwsshould not be used.

� Maximum wall framingspacing should not exceed16" o.c. and must bedesigned to limit deflectionto L/360 under all live anddead loads.

� Steel wall framing must be 20ga. (galvanized) or heavier –16" o.c.

� 1/4" PermaBase should notbe used on walls or ceilings.

� PermaBase Cement Board isnot a water barrier. Consultlocal building code for mois-ture barrier requirements.

� Not recommended for usewith vinyl flooring.

� For exterior and interior fin-ishes applied direct toPermaBase, reinforcingmesh must be embedded inbasecoat. Consult finish manufacturerfor additional requirements.

� PermaBase Cement Boardshould not be exposed totemperatures over 220˚F(105˚C).

SIZES & PACKAGING

Size: Thickness, Width & Length # of Pcs. Per Unit

PermaBase Cement Board

1/2" x 32" x 5' (12.7 mm x 813 mm x 1524 mm) 50

1/2" x 36" x 4' (12.7 mm x 914 mm x 1219 mm) 50

1/2" x 36" x 5' (12.7 mm x 914 mm x 1524 mm) 50

1/2" x 36" x 6' (12.7 mm x 914 mm x 1829 mm) 50

1/2" x 36" x 8' (12.7 mm x 914 mm x 2438 mm) 30

1/2" x 48" x 8' (12.7 mm x 1219 mm x 2438 mm) 30

5/8" x 36" x 5' (15.9 mm x 914 mm x 1524 mm) 35

5/8" x 48" x 8' (15.9 mm x 1219 mm x 2438 mm) 24

3/8" x 48" x 8' (9.5 mm x 1219 mm x 2438 mm) 40*

3/4" x 48" x 8' (19.0 mm x 1219 mm x 2438 mm) 20*

1" x 32" x 8' (25.4 mm x 813 mm x 2438 mm) 20*

PermaBase Underlayment

1/4" x 48" x 4' (7.9 mm x 1219 mm x 1219 mm) 50

1/4" x 36" x 5' (7.9 mm x 914 mm x 1524 mm) 50

COMPARISON CHART

Other FiberCement Cement

Physical Feature Benefits PermaBase Boards Boards

Lowest Weight Glass Mesh Cement Board � � �

Double-Wrapped Edge � � �

Fastens Near Edge With No Breakout � � �

Highest Damage Resistancy From Handling � � �

Cleanest To Score And Snap � � �

Lowest Water Absorption � � �

Meets 40 psf Rating Wind Load Test Results � � �(Stud spacing 16" o.c.)

Cuts With Utility Knife vs. Power Tools � � �

Standard Fasteners Countersink Into Board � � �

Can Be Used In Both Residential and � � �Commercial Steam Rooms And Saunas

Fewer Expansion Joints Needed � � �

Inorganic vs. Organic Core � � �

30-Year Warranty For Interior Use � � �

10-Year Warranty For Exterior Use � � �

* Special order

Product Feature: �Yes �No

TAPE & SCREWSNational Gypsum recommends theuse of PermaBaseTape andPermaBase Screwsto complete yourinstallation.

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WARRANTY

LIMITATIONS

COMPOSITION

ACCESSORIES


An ideal underlayment for interior applications such as:

� Shower and tub enclosures

� Garden/whirlpool tubs

� Countertops

� Backsplashes

� Steamrooms and saunas

� Swimming pool andwhirlpool decks and enclosures

� Floor underlayment– Entryways– Kitchens– Bathrooms– Foyers– Laundry rooms

GENERAL: All framing shouldcomply with local buildingcode requirements and bedesigned to provide supportwith a maximum allowabledeflection of L/360 under allintended loads. Framing mem-bers should be spaced a maxi-mum of 16" o.c.Note: Cut or score PermaBaseon printed side of panel. Installtile and tile setting materials inaccordance with current ANSIspecifications and Tile Councilof America (TCA) guidelines. CONTROL JOINTS: For interiorinstallations, allow a maximumof 30 lineal feet between controljoints. A control joint must beinstalled but not limited to thefollowing locations: whereexpansion joints occur in theframing or building (discontinueall cross furring members locatedbehind joint); when boards abutdissimilar materials; where fram-ing material changes; at changes of building shape orstructural system; at each storyseparation. Place control joints atcorners of window and dooropenings, or follow specifica-tions of architect. Control jointcavity shall not be filled withcoating or other materials.WALLS & CEILINGSWALL FRAMING: Edges ofPermaBase parallel to framingshould be continuously support-ed. Provide additional blockingwhen necessary to permit properPermaBase attachment.

Do not install PermaBase directlyover protrusions from stud planesuch as heavy brackets and fas-tener heads. Studs above ashower floor should either benotched or furred to accommo-date the thickness of the water-proof membrane or pan. The sur-round opening for a tub or pre-cast shower receptor should notbe more than 1/4" longer thanunit to be installed.CEILING FRAMING: Thedeflection of the complete ceil-ing assembly due to dead load

INTERIOR APPLICATIONS

(including insulation,PermaBase, bonding materialand facing material) should notexceed L/360. The dead loadapplied to the ceiling frameshould not exceed 10 psf.Ceiling joist or furring channelshould not exceed 16" o.c.(Edges of PermaBase parallel to framing should be continuously supported.)Provide additional blockingwhen necessary to permit prop-er PermaBase attachment.

PERMABASE CEMENT BOARD:Apply PermaBase with ends andedges closely butted but notforced together. Stagger endsjoints in successive courses. Drivefasteners into field of cementboard first, working toward endsand edges. Space fasteners max-imum 8" o.c. for walls, 6" o.c.for ceilings with perimeter fas-teners at least 3/8" and less than5/8" from ends and edges.Ensure PermaBase is tight toframing.

TUB & SHOWER SURROUND


Tile

Adhesive orLatex-Portland

CementMortar

XP® GypsumBoard

Fiberglass Mesh Tape(Alkali Resistant)

PermaBase CementBoard Screws, 8" o.c.


2"x 4" Wood Studs or20 ga. 3-5/8" MetalStuds 16" o.c.

APPLICATIONS

INSTALLATION

148 PERMABASE® BRAND CEMENT BOARD

JOINT REINFORCEMENT:Trowel bonding material tocompletely fill the taperedrecessed board joints and gapsbetween each panel. On non-tapered joints apply a 6" wide,approx. 1/16" thick coat ofbonding material over entirejoint. For all joints, immediatelyembed 2" alkali resistant fiber-glass mesh tape fully intoapplied bonding material andallow to cure. Same bondingmaterial should be applied tocorners, control joints, trims andother accessories. Feather bond-ing material over fasteners tofully conceal.

FLOORS & COUNTERSSUBFLOOR OR BASE: Forflooring applications with 16"o.c. floor joists, 5/8" tongueand groove exterior grade ply-wood or 3/4" tongue andgroove exterior grade OSB maybe used. For 19.2" o.c. and 24"o.c. floor joists, 3/4" tongue andgroove exterior grade plywoodor OSB must be used. Tile sizefor floors with 24" o.c. floor joistsmust be 12" x 12" or larger. Thejoist and subfloor assembly mustmeet L/360 as well as the appro-priate code tables for live anddead loads.

UNDERLAYMENT: Using a 1/4"square-notched trowel, apply a setting bed of latex-Portlandcement mortar (or thin-set mor-tar) to the subfloor or counterbase. Immediately laminatePermaBase to subfloor or baseleaving a 1/8" space betweenboards at all joints and corners.Leave a 1/4" gap along walls.Stagger all joints so that they do not line up with underlyingsubstrate joints. FastenPermaBase every 8" o.c.throughout board field andaround all edges while settingbed mortar is still workable.

Around perimeter of eachboard, locate fasteners 2" fromcorners and not less than 3/8"from the edges. Fill all jointssolid with bonding material.On non-tapered joints such asbutt ends, apply a 6" wide,1/16" thick coat over the entirejoint. For all joints, immediate-ly embed 2" fiberglass meshtape fully into applied bondingmaterial; ensure that tape iscentered over joint. Applybonding material over fasten-ers to fully conceal. Remove allexcess bonding material andallow to cure.

FLOOR UNDERLAYMENT COUNTERTOP


Cabinet

Plywood

Latex-PortlandCement Mortar



Tile

Tile

I-Joists

Plywood





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149PERMABASE® BRAND CEMENT BOARD

An ideal substrate for exteriorapplications such as:

� Tile applications

� Stucco applications

� Countertops

� Soffit panels

� Sheathing panels

� Decks

� Outdoor kitchens/grills

GENERAL: All framing should comply with local buildingcode requirements and bedesigned to provide supportwith a maximum allowabledeflection of L/360 under allintended live (including wind)and dead loads.Note: Cut or score PermaBaseon rough side of panel. Installtile and tile setting materials inaccordance with current ANSIspecifications and Tile Councilof America (TCA) guidelines.CONTROL JOINTS: For exteriorinstallations, allow a maximumof 16 lineal feet between controljoints. (For exterior tile applica-tions, control joints should bespaced a maximum of every12'.) A control joint must beinstalled but not limited to the following locations: whereexpansion joints occur in theframing or building (discontinueall cross furring members locatedbehind joint); when boards abutdissimilar materials; where fram-ing material changes; at changesof building shape or structuralsystem; at each story separation.Place control joints at corners ofwindow and door openings, orfollow specifications of architect.Control joint cavity shall not befilled with coating or othermaterials.DECKSSUBFLOOR: Plywood shouldbe securely glued and fastenedto floor joists spaced a maxi-mum of 16" o.c. Subfloorshould be sloped at a mini-mum pitch of 1/4" per foot. Thefloor surface should be true toplane within 1/8" in 10'.

UNDERLAYMENT: Using a 1/4"square-notched trowel, apply a setting bed of latex-Portlandcement mortar to the subfloor.Immediately laminatePermaBase to subfloor, leaving a1/8" space between boards at alljoints and corners. Leave a 1/4"gap along walls. Stagger all jointsso they do not line up withunderlying substrate joints.Fasten PermaBase every 8" o.c.throughout board field andaround all edges while settingbed mortar is still workable.Around the perimeter of eachboard, locate fasteners 2" fromthe corners and not less than3/8" from the edges. Fill all jointssolid with bonding material. On non-tapered joints such as buttends, apply a 6" wide, 1/16"thick coat over the entire joint.For all joints, immediatelyembed alkali resistant fiberglassmesh tape fully into appliedbonding material; ensure thattape is centered over joint. Applybonding material over fastenersto fully conceal. Remove allexcess bonding material andallow to cure.WATERPROOF MEMBRANE:Trowel apply waterproof mem-brane to the entire surface ofthe PermaBase, followingmembrane manufacturer’sinstallation instructions indetail.

WALLS & CEILINGSWALL FRAMING: Studsshould be spaced a maximumof 16" o.c. Edges/ends ofPermaBase parallel to framingshould be continuously sup-ported. Provide additionalblocking when necessary topermit proper PermaBaseattachment. Do not installPermaBase directly over pro-trusions from stud plane suchas heavy brackets or fastenerheads.CEILING FRAMING: Thedeflection of the complete ceil-ing assembly due to dead load(including insulation,PermaBase, bonding materialand facing material) should notexceed L/360. The dead loadapplied to the ceiling frameshould not exceed 10 psf.Ceiling joist or furring channelshould not exceed 16" o.c.(Edges of PermaBase parallel toframing should be continuous-ly supported.) Provide addition-al blocking when necessary topermit proper PermaBaseattachment.

EXTERIOR APPLICATIONS

WEATHER BARRIER: WhilePermaBase is unaffected by moisture, a water barrier mustbe installed to protect the cavi-ty. It should be installedaccording to the manufacturer’sspecifications.PERMABASE CEMENTBOARD: Apply PermaBasewith ends and edges closelybutted but not forced together.Stagger end joints in successivecourses. Drive fasteners intofield of cement board first,working toward ends andedges. Space fasteners maxi-mum 8" o.c. for walls, 6" o.c.for ceilings with perimeter fas-teners at least 3/8" and less than5/8" from ends and edges.

JOINT REINFORCEMENT:Trowel bonding material tocompletely fill the taperedrecessed board joints and gapsbetween each panel. On non-tapered joints apply a 6" wide,approx. 1/16" thick coat ofbonding material over entirejoint. For all joints, immediate-ly embed 4" alkali resistantfiberglass mesh tape fully intoapplied bonding material andallow to cure. Same bondingmaterial should be applied tocorners, control joints, trims orother accessories. Featherbonding material over fastenersto fully conceal.

APPLICATIONS

INSTALLATION


Cement Board Stucco is awater-managed exterior wallsystem designed to provideincreased high-impact andweather resistance andimproved dimensional stabilitywhere exterior insulation valueis not required. For the purpos-es of meeting structural rackingor fire code requirements, it isapplied over the followingapproved sheathings: Exposure1 or exterior plywood (grade C-D or better); Exposure 1 OSB;glass mat gypsum substratemeeting ASTM C 1177; orwater resistant core gypsum(ASTM C 1396).It combines the strength anddurability of PermaBase CementBoard with the performanceand beauty of reinforced basecoats and textured finishes. Allfinishes are available in a limit-less color selection and offer performance enhance-ment options ranging fromextra mildew resistance toadded flexibility.Behind the system, a weather-resistant barrier complyingwith ASTM D-226 protectsapproved sheathings and otherstructural components andserves as a component to evac-uate incidental water. CementBoard Stucco allows you toenclose and finish a project inas little as two days, speedingoccupancy.

For high-impact and weather-resistant exterior wall in resi-dential and low-rise commer-cial applications.

DURABILITY/STRENGTH:Moisture resistant, durablePermaBase Cement Board sub-strates applied over a primarysheathing provide extraordi-nary impact and punctureresistance to the system.WEATHER RESISTANCE:100% Acrylic base coats andfinishes repel weather at thesystem’s surface.WATER-MANAGED DESIGN:The water-managed design ofthe system provides drainage tothe exterior of incidental waterthat might enter around orthrough window or door open-ings and penetrate behind thecladding in frame construction.

WATER-MANAGED, HIGH-IMPACT RESISTANT WALL SYSTEM

DESIGN OPTIONS:Cement Board Stucco providesthe popular stucco look,including the attachment ofspecial pre-molded shapes anda wide variety of finish textureand color options in standardcolors and custom colors.Contact exterior coatings manufacturer for color and installation instructions.

� Use is limited to residentialand low-rise commercialapplications.

� Thin veneer construction willtend to reveal planar irregu-larities in the frame construc-tion.

� Minor cracking at jointsmight become visible in thefinished exterior surface.

� For exterior finishes applieddirect to PermaBase, rein-forcing mesh must beembedded in basecoat.Consult exterior manufac-turer for additional installa-tion requirements.

� For conventional PortlandCement plaster systems, self-furring metal lath must be used over PermaBaseand adhered to studs.

CEMENT BOARD STUCCO WALL SYSTEM

Framing

Acceptable Sheathing

Moisture Protection Barrier (By Others)

PermaBase® BRANDCement Board

Base Coat

4" Mesh Tape

Exterior Finish

Flashing Or Starter Track

Base Coat

Corrosion ResistantFasteners

Reinforcing Mesh

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APPLICATIONS

USES

ADVANTAGES

LIMITATIONS


FIRE-RATED ASSEMBLIES

UL LISTED PERMABASE® CEMENT BOARD PARTITIONS – STEEL FRAMINGFire Rating UL Design No. Description

1 hr. V452

1 hr. V438

1 hr. U420

1 hr. U425Load Bearing

2 hr. V452

2 hr. V438

2 hr. U420

2 hr. U425Load Bearing

3 hr. V438

UL LISTED PERMABASE® CEMENT BOARD PARTITIONS – WOOD FRAMING Fire Rating UL Design No. Description

1 hr. U305

1 hr. U309

2 hr. U301

2 hr. U371

1/2" PermaBase applied vertically or horizontally to one side of 3-5/8"steel studs 16" o.c. 5/8" Fire-Shield Gypsum Board applied vertically toopposite side. 3" mineral wool insulation in stud cavities.

1/2" PermaBase applied vertically or horizontally over 5/8" Fire-ShieldGypsum Board applied vertically to each side of 3-5/8" steel studs 24"o.c. PermaBase secured to studs with cement board screws of adequatelength to penetrate studs 3/8" spaced 8" o.c.

1/2" PermaBase applied vertically or horizontally over 5/8" Fire-ShieldGypsum Board applied vertically to each side double row of 1-5/8" steelstuds 24" o.c. spaced 6" apart. PermaBase secured to studs with cementboard screws of adequate length to penetrate studs 3/8" spaced 8" o.c.

1/2" PermaBase applied vertically or horizontally over 5/8" Fire-ShieldGypsum Board applied vertically to each side of 3-1/2", 20 gage steelstuds 24" o.c. PermaBase secured to studs with cement board screws ofadequate length to penetrate studs 3/8" spaced 8" o.c.

1/2" PermaBase applied vertically over 1/2" Fire-Shield C GypsumBoard, applied vertically to one side of 3-5/8" steel studs 16" o.c. 2 lay-ers 1/2" Fire-Shield C Gypsum Board applied vertically to oppositeside. 3" mineral wool insulation in stud cavities.

1/2" PermaBase applied vertically or horizontally over two layers 5/8"Fire-Shield Gypsum Board applied vertically to each side of 2-1/2" steelstuds 24" o.c. PermaBase secured to studs with cement board screws ofadequate length to penetrate studs 3/8" spaced 8" o.c.

1/2" PermaBase applied vertically or horizontally over two layers 5/8"Fire-Shield Gypsum Board applied vertically to each side double row of1-5/8" steel studs 24" o.c. spaced 6" apart. PermaBase secured to studswith cement board screws of adequate length to penetrate studs 3/8"spaced 8" o.c.

1/2" PermaBase applied vertically or horizontally over two layers 5/8"Fire-Shield Gypsum Board applied vertically to each side of 3-1/2", 20gauge steel studs 24" o.c. PermaBase secured to studs with cementboard screws of adequate length to penetrate studs 3/8" spaced 8" o.c.

1/2" PermaBase applied vertically or horizontally over 5/8" Fire-ShieldGypsum Boardapplied horizontally or vertically to each side of 2x4wood studs 16" o.c. PermaBase secured to studs with cement boardscrews of adequate length to penetrate studs 3/4" spaced 8" o.c.

1/2" PermaBase applied vertically or horizontally over 5/8" Fire-ShieldGypsum Board applied horizontally or vertically to each side of 2x4wood studs 24" o.c. PermaBase secured to studs with cement boardscrews of adequate length to penetrate studs 3/4" spaced 8" o.c.

1/2" PermaBase applied vertically over two layers 5/8" Fire-ShieldGypsum Board, applied either horizontally or vertically to each side of2x4 wood studs 16" o.c. PermaBase secured to studs with cementboard screws of adequate length to penetrate studs 3/4" spaced 8" o.c.

1/2" PermaBase applied vertically over either two layers 5/8" Fire-ShieldGypsum Board, applied either horizontally or vertically to the interiorside of 2x4 wood studs 16" o.c., or over 5/8" Gypsum Sheathing appliedto exterior side with portland cement stucco, brick veneer, thin brickfinishes. PermaBase secured to studs with cement board screws of adequate length to penetrate studs 3/4" spaced 8" o.c.

1/2" PermaBase applied vertically or horizontally over three layers 5/8"Fire-Shield Gypsum Board applied vertically to each side of 2-1/2" steelstuds 24" o.c. PermaBase secured to studs with cement board screws ofadequate length to penetrate studs 3/8" spaced 8" o.c.


1-Hour Rating

1/2" PermaBase

Steel studs (with 3" mineral fiber insulation)

5/8" Fire-Shield Gypsum Board

2-Hour Rating

1/2" PermaBase

Steel studs (with 3" mineral fiber insulation)

1/2" Fire-Shield C Gypsum Board

FIRE-RATED WALLASSEMBLIESPermaBase Cement Board hasbeen tested and/or approvedfor use in a variety of fire-ratedwall systems.1-HOUR RATING – The 1-hour wall assembly consists of3-5/8" steel studs, 16" o.c., onelayer of 1/2" PermaBaseattached horizontally or verti-cally with 1-1/4" long cementboard screws 8" o.c. in thefield and perimeter on one sideand one layer of 5/8" Fire-Shield® wallboard attached ver-tically on opposite side withjoints staggered to those ofopposite side, with 1-1/4" longdrywall screws 8" o.c. in thefield and perimeter with 3"thick mineral fiber insulationbatts in the stud cavities. ULV452, ITS/WHI Report No.J99-4001.

2-HOUR FIRE RATING – The2-hour wall assembly consistsof 3-5/8" steel studs, 16" o.c.on one side, base layer of 1/2"Fire-Shield C wallboardattached vertically with 1" dry-wall screws 24" o.c. in the fieldand perimeter and face layer of1/2" PermaBase attached verti-cally with 1-5/8" cement boardscrews, 8" o.c. in the field andperimeter. Two layers of 1/2"Fire-Shield C wallboardapplied vertically to the oppo-site side, base layer attachedwith 1" drywall screws 24" o.c.in the field and perimeter andface layer attached with 1-5/8"drywall screws 12" o.c. in thefield and perimeter, with 3"thick mineral fiber insulationbatts in the stud cavities. Alljoints staggered between faceand base layer. UL V452,ITS/WHI Report No. J98-32931.

PERMABASE® BRAND CEMENT BOARD TECHNICAL DATA

Shea

r Bon

d St

reng

th7

days

(psi

)

PermaBase meets the following codes and standards:

2006 International Residential Code2006 International Building CodeASTM C 1325ANSI A118.9ICC Acceptance Criteria 59 (AC59)

Code Report References

ICBO ES Inc. ER-5731PermaBase Cement Board

National Evaluation Service Inc. Report No. NER-578PermaBase Cement Board

PHYSICAL PROPERTIES

Property Test Method 1/2" PermaBase

Water Absorption % ASTM C 473 <8by Weight/24 Hours

Flexural Strength (psi) ASTM C 947 750

Fastener Holding ASTM D 1037 90(Wet and Dry, lbs.) (0.400" head diameter)

Weight (psf) ASTM C 473 3

Freeze/Thaw (cycles) ASTM C 666 100per ANSI A118.9 Procedure B

Flame Spread/ ASTM E 84 0/0Smoke Developed

Compressive Strength (psi) ASTM D 2394 2250(Indentation)

Wind Load ASTM E 330 40(psf, studs 16" o.c.)

Thermal “R”/k Value Property of Material 0.2/2.7

Bending Radius (ft.) Property of Material 5

Standard Method for ASTM C 627 Lightevaluating ceramic Commercialfloor installation system

Falling Ball Impact ASTM D 1037 pass(12" drop)

Dry-Set Portland ANSI A118.1 204Cement Mortar

Latex-Portland ANSI A118.4 241Cement Mortar

Organic Adhesives ANSI A136.1 159Type 1

Linear Variation ASTM D 1037 0.05%(Due to change inmoisture content)

Fungus Resistance ASTM G 21 (No growth)

Mold Growth on Surface ASTM D 3273* 10

* When tested by an independent laboratory per ASTM D 3273 ("StandardTest Method for Resistance to Growth of Mold on the Surface of InteriorCoatings in an Environmental Chamber"), PermaBase achieved a panel scoreof 10, the highest score possible, indicating no mold growth under the labora-tory test conditions. The use of PermaBase in actual installations may notproduce the same results as were achieved in controlled laboratory condi-tions. No material can be considered "mold proof," nor is it certain that any material will resist mold indefinitely.

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TECHNICAL DATA


PermaBase Flex® BRANDCement Board is a polymer-modified cement board rein-forced with an alkali-resistantfiber mesh ideal for use aroundceilings, beams, columns, arch-es and archways, walls andanywhere an evenly curvedsurface is required.

� Radius wall construction

� Exterior and interior columns

� Barrel ceilings

� Radius shower walls

� Radius tub step-ups

� Radius archways

� Radius stair construction

� Saunas and steamrooms

� 6" (150 mm) minimumradius for 90˚ corners.

� Bends immediately, easilyand evenly.

� The only 1/2" lightweightcement board that bends.

� Can be bent without water saturation or kerf cuts.

� Easy installation, reducesskilled labor costs.

� Easy to cut and install withscrews.

� Can be used for interior or exterior applications.

� Impact resistant.

� Creates uniform curved surfaces.

� Unaffected by water or moisture.

� Dimensionally stable.

� For convex surfaces,PermaBase Flex must beapplied with the rough sur-face and tapered edgesexposed.

� For concave surfaces,PermaBase Flex must beapplied with the smooth surface exposed.

� PermaBase Flex CementBoard should not be usedfor fire-rated assemblies.

� Maximum framing spacingshould not exceed 8" o.c.and must be designed tolimit deflection to less thanL/360 under all live anddead loads.

� Steel framing must be 20gauge or heavier.

� PermaBase Flex should beused on curved walls andceilings. For flat walls andceilings refer to PermaBaseCement Board.

� PermaBase Flex CementBoard is vapor permeableand unaffected by water butis not a water barrier.Consult local building codefor moisture barrier require-ments.

� On exterior installations awaterproof membranemust be applied behindPermaBase Flex CementBoard.

� Do not use drywall nails,screws or fiberglass meshtape.

� Maximum fastener spacingshould not exceed 8" o.c. forwall and 6" o.c. for ceilingapplications.

PermaBase Flex makes curved designs easy toachieve. On this indoor pool ceiling applica-tion, PermaBase Flex is used with a hard coatplaster finish.

PermaBase Flex®BRAND Cement Board

PHYSICAL PROPERTIESProperty Test Method PermaBase Flex

Compressive Strength (psi) ASTM D 2394 1022(Indentation)

Weight (psf) ASTM C 473 3.0

Water Absorption % ASTM C 473 Less than 8by Weight/24 Hours

Falling Ball Impact (12" drop) ASTM D 1037 Pass

Sizes/Packaging

Thickness: 1/2" (12.7 mm)

Width: 4' (1219 mm)

Length: 8' (2438 mm)

Mass: 3.0 lb./ft. (14.6 kg/m)

Packaging: 30 boards per package.

DESCRIPTION

APPLICATIONS

FEATURES/BENEFITS

LIMITATIONS

TECHNICAL DATA


INTERIOR APPLICATIONS

WALL FRAMING: Studsshould be spaced a maximumof 8" o.c. Edges/ends ofPermaBase Flex parallel toframing should be continuous-ly supported. Provide addition-al blocking when necessary topermit proper PermaBase Flexattachment. Do not installPermaBase Flex directly overprotrusions from stud planesuch as heavy brackets or fas-tener heads.

Studs above a shower floorshould be either notched orfurred to accommodate thethickness of the waterproofmembrane or pan. The sur-round opening for a tub or pre-cast shower receptor should not be more than 1/4" longerthan unit to be installed.

CEILING FRAMING: Thedeflection of the complete ceil-ing assembly due to dead load(including insulation,PermaBase Flex, bondingmaterial and facing material)should not exceed L/360. Thedead load applied to the ceil-ing frame should not exceed10 psf. Ceiling joist or furringchannel should not exceed 8"o.c. Edges of PermaBase Flexparallel to framing should becontinuously supported.Provide additional blockingwhen necessary to permitproper PermaBase attachment.

PERMABASE FLEX CEMENTBOARD: Apply PermaBaseFlex with ends and edgesclosely butted but not forcedtogether. Stagger end joints insuccessive courses. Drive fas-teners into field of cementboard first, working towardends and edges. Space fasten-ers maximum 8" o.c. for walls,6" o.c. for ceilings with perime-ter fasteners at least 3/8" andless than 5/8" from ends andedges. Ensure PermaBase Flexis tight to framing.

JOINT REINFORCEMENT:Trowel bonding material tocompletely fill the taperedrecessed board joints and gapsbetween each panel. On non-tapered joints apply a 6" wide,

approx. 1/16" thick coat ofbonding material over entirejoint. For all joints, immediate-ly embed 2" alkali-resistantfiberglass mesh tape fully intoapplied bonding material andallow to cure. Same bondingmaterial should be applied tocorners, control joints, trims orother accessories. Featherbonding material over fastenersto fully conceal.

EXTERIOR APPLICATIONS

WALL FRAMING: Studsshould be spaced a maximumof 8" o.c. Edges/ends ofPermaBase Flex parallel toframing should be continuous-ly supported. Provide addition-al blocking when necessary topermit proper PermaBase Flexattachment. Do not installPermaBase Flex directly overprotrusions from stud planesuch as heavy brackets or fas-tener heads.

WEATHER BARRIER: WhilePermaBase Flex is unaffectedby moisture, a water barriermust be installed to protect thecavity. It should be installedaccording to the manufactur-er‘s specifications.

CEILING FRAMING: Thedeflection of the complete ceil-ing assembly due to dead load(including insulation,PermaBase Flex, bondingmaterial and facing material)should not exceed L/360. Thedead load applied to the ceil-ing frame should not exceed10 psf. Ceiling joist or furringchannel should not exceed 8"o.c. (Edges of PermaBase Flexparallel to framing should becontinuously supported.)Provide additional blockingwhen necessary to permitproper PermaBase Flex attach-ment.

PERMABASE FLEX CEMENTBOARD: Apply PermaBaseFlex with ends and edgesclosely butted but not forcedtogether. Stagger end joints insuccessive courses. Drive fas-teners into field of cementboard first, working towardends and edges. Space fasten-ers maximum 8" o.c. for walls,6" o.c. for ceilings with perime-ter fasteners at least 3/8" andless than 5/8" from ends and

edges. Ensure PermaBase Flexis tight to framing.

JOINT REINFORCEMENT:Trowel bonding material tocompletely fill the taperedrecessed board joints and gapsbetween each panel. On non-tapered joints apply a 6" wide,approx. 1/16" thick coat ofbonding material over entirejoint. For all joints, immediate-ly embed 4" alkali-resistantfiberglass mesh tape fully intoapplied bonding material andallow to cure. Same bondingmaterial should be applied tocorners, control joints, trims orother accessories. Featherbonding material over fastenersto fully conceal.

CONTROL JOINTS: For interi-or installations, allow a maxi-mum of 30 lineal feet betweencontrol joints. For exteriorinstallations, allow a maximumof 16 lineal feet between con-trol joints. (For exterior tile

applications, control jointsshould be used a maximum ofevery 12'.) A control joint mustbe installed but not limited tothe following locations: whereexpansion joints occur in theframing or building (discontin-ue all cross furring memberslocated behind joint); whenboards abut dissimilar materi-als; where framing materialchanges; at changes at buildingshape or structural system; ateach story separation. Placecontrol joints at corners of win-dow and door openings, or fol-low specifications of architect.

GENERAL: All framing should comply with local buildingcode requirements and bedesigned to provide supportwith a maximum allowabledeflection of L/360 under allintended live (including wind)and dead loads.

Interior Installation

Exterior Installation

09

28

00

09 28 00/NGC

INSTALLATION


®

SECTION 09 28 00CEMENT BOARD

A. This section is written in CSI 3-part format and it assumesthat the general conditions ofthe contract will be AIAA201. This section is propri-etary and includes onlyNational Gypsum products.

PART 1 GENERAL

1.01 SUMMARY

A. Section includes:

1.Cement backerboard forceramic tile, other interiorand exterior applications forwalls and ceilings.

2.Underlayment for ceramic tile installations for interiorand exterior floors.

3.Substrate for ceramic tileinstallation for interior and exterior countertops.

1.02 SUBMITTALS

A. Product Data:Manufacturers’ specifica-tions and installation instruc-tions for each product speci-fied.

1.03 DELIVERY, STORAGE,AND HANDLING

A. Packaging and Shipping:Have materials shipped inmanufacturer’s originalpackages showing manufac-turer’s name and productbrand name.

B. Storage and Protection:Store materials inside andprotected from damage bythe elements. Protect ends,edges, and faces of cementboards from damage.

PART 2 PRODUCTS

2.01 MANUFACTURER

A. National Gypsum Company

2.02 MATERIALS

A. Cement Board

1.Backer Board:Cementitious, water-durableboard; surfaced with fiber-glass reinforcing mesh onfront and back; long edgeswrapped; and complyingwith ANSI A118.9 and ASTMC 1325 (PermaBase BRANDCement Board).

a.Thickness: 1/2" or 5/8"b.Width: 2' 8", 3', or 4'c. Length: 4', 5', 6', or 8'd.Edges: Taperede.Density: 72 lbs. per cu. ft.f. Water Absorption: Not

greater than 8% when tested for 24 hours in accordance with ASTM C 473.

2. Bendable Backer Board:Cementitious, water-durableboard; surfaced with fiber-glass reinforcing mesh onfront and back; long edgeswrapped; and complyingwith ANSI A118.9(PermaBase Flex BRANDCement Board).

a.Thickness: 1/2"b.Width: 4'c. Length: 8'd.Edges: Taperede.Density: 72 lbs. per cu. ft.f. Water Absorption: Not


3. Underlayment:Cementitious, water-durable board; surfacedwith fiberglass reinforcingmesh on front and back;long edges wrapped; andcomplying with ANSIA118.9 and ASTM C 1325(PermaBase BRAND CementBoard).a.Thickness: 1/4"b.Width: 3' or 4'c. Length: 5'd.Edges: Taperede.Density: 72 lbs. per cu. ft.f. Water Absorption: Not


B. Fasteners:

1.Nails: 1-1/2" long, hotdipped galvanized, for usewith wood framing and com-plying with FederalSpecification FF-N-105B,Type 2, Style 20.

2.Screws: PermaBaseCement Board Hi-Lothread screws (No. 8),wafer head, corrosion-resistant, 1-1/4" or 1-5/8"long, for use with woodframing and complyingwith ASTM C 1002.

3.Screws: PermaBase CementBoard drill point screws (No.8) wafer head, corrosion-resis-tant, 1-1/4" or 1-5/8" long, foruse with 20 to 14 ga. steelframing and complying withASTM C 1002.

C. Joint Treatment:

1.Tape: Alkali-resistant fiber-glass mesh tape for joint rein-forcement, 2" wide mesh tapefor interior applications and 4"wide mesh tape for exteriorapplications.

2.Bonding Materials: Latex-Portland cement mortar orDry-Set (thin-set) mortar, forjoint treatment and settingface material, complyingwith ANSI A118.1 or A118.4standards. Type 1 organicadhesive meeting ANSIA136.1 may be utilized forinterior use only.

PART 3 EXECUTION

3.01 INSTALLATION

A. General: In accordance withmanufacturer’s recommenda-tions. National GypsumCompany “PermaBaseCement Board ConstructionGuide” and the followingstandard:

1. Installation of cementitiousbacker units: ANSI A108.11.

3.02 PROTECTION

A. Protect cement board installationsfrom damage and deteriorationuntil the date of substantial completion.

SPECIFICATIONS


LIMITED WARRANTY AND REMEDIESProducts manufactured and sold byNational Gypsum Company are war-ranted by National GypsumCompany to its customers to be freefrom defects in materials and work-manship at the time of shipment. THISEXPRESS WARRANTY IS THE ONLYWARRANTY APPLICABLE TOSUCH PRODUCTS, AND IS INLIEU OF AND EXCLUDES ALLOTHER EXPRESS ORAL OR WRIT-TEN WARRANTIES AND ALLIMPLIED WARRANTIES, INCLUD-ING BUT NOT LIMITED TO THEIMPLIED WARRANTIES OF MER-CHANTABILITY AND FITNESS FORA PARTICULAR PURPOSE.

National Gypsum Company will notbe liable for any incidental, indirector consequential losses, damages orexpenses. The customer’s exclusiveremedy for any type of claim oraction for defective products will be limited to the replace-ment of the products (in the formoriginally shipped) or, at NationalGypsum’s option, to a payment orcredit not greater than the originalpurchase price of the products.

National Gypsum Company will notbe liable for products claimed to bedefective where the defect resultedfrom causes not within NationalGypsum’s control, or which arose oroccurred after shipment, includingbut not limited to accidents, misuse,mishandling, improper installation,contamination or adulteration byother materials or goods, or abnor-mal conditions of temperature, mois-ture, dirt or corrosive matter.

Any claim that products sold byNational Gypsum Company weredefective or other-wise did not con-form to the contract of sale is waivedunless the customer submits it in writ-ing to National Gypsum within thirty(30) days from the date the customerdiscovered or should have discoveredthe defect or nonconformance. Nolegal action or proceeding complain-ing of goods sold by NationalGypsum may be brought by the cus-tomer more than one year after the date thecustomer discovered or should have discov-ered the defect or problem of which it com-plains.

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