PermaBase®

BRAND

Cement BoardConstruction Guide

09 28 00/NGC

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PermaBase®BRANDCement BoardDescriptionPermaBase® BRAND Cement Boardis a rigid substrate made of Portlandcement, aggregate and glass meshthat provides an exceptionally hard,durable surface that is able to with-stand prolonged exposure tomoisture.

PermaBase offers a competitiveadvantage over similar productson the market with its patentedEdgeTech® technology. The tapered,double-wrapped edge designallows for closer nail or screwapplication to the edge.

Features/Benefits� Double-wrapped edge withEdgeTech technology allows forcloser fastener application ofnails or screws at the edgewithout crumbling or spinout.

� IRC and IBC 2006 Compliant –Meets ASTM C 1325.

� PermaBase resists the growthof mold achieving a panelscore of 10, the highest scorepossible, perASTMD 3273.*

� Homogeneous core has fewervoids and provides a very easyand clean score and snap.

� Can be cut utilizing a standardutility knife and straightedge.With PermaBase’s unique corecomposition, little or no addi-tional labor is needed to cleanthe edge after a cut.

� PermaBase is impact resistant,extremely durable and dimen-sionally stable. It has excellentoverall flexural, compressive andtensile strength characteristics.

� PermaBase is highly moistureresistant, and will not rot,disintegrate or swell whenexposed to water.

� 1/2" PermaBase may be usedin 1 hour and 2 hour ratedassemblies and is UL Classified.

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

� 1/4" PermaBase is ideal forremodeling applications becauseit can be applied directly over avariety of existing countertopsurfaces.

� As a floor underlayment 1/4"PermaBase eliminates the needto modify adjacent thresholdswhen abutting to carpeting,wood flooring and other commonflooring materials.

� Lowest water absorption of anycement board per ASTM C 473.

� Can be used in residential andcommercial saunas and steamrooms.

� Available in various widths,lengths and thicknesses.

� Can be used in 24" o.c. floortruss construction, with specificrequirements.

� Suitable for both interior andexterior applications.

A. Double-wrappededge with EdgeTech®

technology

B. Fiberglass mesh

C. Cementitious core

AB

C

GridMarX®

1/4" PermaBase Underlaymenthas GridMarX, a pre-printedfastening pattern that ensuresthe proper number of fastenerswhile taking the guesswork outof spacing, layout and trimming.

* When tested by an independent laboratory perASTM D 3273 ("Standard Test Methodfor Resistance to Growth of Mold on the Surface of Interior Coatings in an EnvironmentalChamber"), PermaBase achieved a panel score of 10, the highest score possible, indicatingno mold growth under the laboratory test conditions. The use of PermaBase in actualinstallations may not produce the same results as were achieved in controlled laboratoryconditions. No material can be considered "mold proof," nor is it certain that anymaterial will resist mold indefinitely.

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CompositionCementitious Backer Unit(CBU): PermaBase Cement Boardis a nailable, screwable backerboardand underlayment panel which iscomposed of Portland cement,aggregates and reinforcementsthat has a significant ability toremain unaffected by prolongedexposure to moisture. PermaBasecomplies with ASTM C 1325 andANSI A118.9.

AccessoriesJoint Reinforcement:PermaBase mesh tape must beused on all edges and cuts made tosize. Use 2" wide polymer-coated(alkali resistant) mesh tape for inte-rior applications and 4" wide poly-mer-coated (alkali resistant) meshtape for exterior applications.

Bonding Materials: Treat jointand set facing material preferablywith latex-Portland cement mortaror with dry-set (thin-set) mortar.All mortars should comply withANSI A118.1 or A118.4 standards.Type 1 organic adhesive meetingANSI A-136.1 may be utilized forinterior use only.

Fasteners: Galvanized roofingnails, 1-1/2" long with hot dippedgalvanized coating, for use withwood framing. Nails should meetFederal Specification #FF-N105B/type 2 style 20.

PermaBase corrosion resistant screwsor equivalent, 1-1/4" or 1-5/8"long, for use with wood framing.Type S-12 screws or equivalent,1-1/4" or 1-5/8" long, for use with20 ga. or heavier steel framing.

Warranty� 30-year limited warranty forinterior applications.

� 10-year limited warranty forexterior applications.

Limitations� Joints should be treated withalkali resistant fiberglass meshtape set in a latex-Portlandcement mortar.

� Conventional paper drywall tape,joint compound and drywall nailsor screws should not be used.

� Maximum wall framing spacingshould not exceed 16" o.c.and must be designed to limitdeflection to L/360 under alllive and dead loads.

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

� 1/4" PermaBase should not beused on walls or ceilings.

� PermaBase Cement Board is nota water barrier. Consult localbuilding code for moisture barrierrequirements.

� Not recommended for use withvinyl flooring.

� For exterior and interior finishesapplied direct to PermaBase,reinforcing mesh must beembedded in basecoat.Consult finish manufacturer foradditional requirements.

� PermaBase Cement Boardshould not be exposed to tem-peratures 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*

3/8" x 36" x 5' (9.5 mm x 914 mm x 1524 mm) 50*

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

LowWeight Glass Mesh Cement Board � � �

Double-Wrapped Edge � � �

Fastens Near EdgeWith 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

Inorganic vs. Organic Core � � �

30-Year Warranty For Interior Use � � �

10-Year Warranty For Exterior Use � � �

* Special order

Product Feature: �Yes �No

Tape & ScrewsNational Gypsumrecommends the useof PermaBase Tapeand PermaBaseScrews to completeyour installation.

ApplicationsAn ideal underlayment forinterior applications such as:

� Shower and tub enclosures

� Garden/whirlpool tubs

� Countertops

� Backsplashes

� Steamrooms and saunas

� Swimming pool and whirlpooldecks and enclosures

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

InstallationGeneral: All framing should complywith local building code require-ments and be designed to providesupport with a maximum allowabledeflection of L/360 under all intend-ed loads. Framing members shouldbe spaced a maximum of 16" o.c.

Note: Cut or score PermaBase onprinted side of panel. Install tileand tile setting materials in accor-dance with current ANSI specifica-tions and Tile Council of America(TCA) guidelines.

Control Joints: For interior installa-tions, allow a maximum of 30 linealfeet between control joints.A controljoint must be installed but not limitedto the following locations: whereexpansion joints occur in the framingor building (discontinue all cross furringmembers located behind joint); whenboards abut dissimilar materials;where framing material changes;at changes of building shape or struc-tural system; at each story separation.Place control joints at corners ofwindow and door openings, or followspecifications of architect. Controljoint cavity shall not be filled withcoating or other materials.

WALLS & CEILINGS

Wall Framing: Edges of PermaBaseparallel to framing should be contin-uously supported. Provide additionalblocking when necessary to permitproper PermaBase attachment.

Do not install PermaBase directlyover protrusions from stud planesuch as heavy brackets and fastenerheads. Studs above a shower floorshould either be notched or furredto accommodate the thickness ofthe waterproof membrane or pan.The surround opening for a tub or

Interior Applications

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precast shower receptor should notbe more than 1/4" longer than unitto be installed.

Ceiling Framing: The deflectionof the complete ceiling assemblydue to dead load (including insula-tion, PermaBase, bonding materialand facing material) should notexceed L/360. The dead loadapplied to the ceiling frame shouldnot exceed 10 psf. Ceiling joist orfurring channel should not exceed16" o.c. (Edges of PermaBaseparallel to framing should becontinuously supported.) Provide

additional blocking when necessaryto permit proper PermaBaseattachment.

PermaBase Cement Board:ApplyPermaBase with ends and edgesclosely butted but not forced together.Stagger ends joints in successivecourses. Drive fasteners into field ofcement board first, working towardends and edges. Space fastenersmaximum 8" o.c. for walls, 6" o.c.for ceilings with perimeter fasteners

TUB & SHOWER SURROUND

PermaBaseCement Board

Tile

Adhesive orLatex-PortlandCement Mortar

XP® GypsumBoard

FiberglassMesh Tape(Alkali Resistant)

PermaBaseCement BoardScrews, 8" o.c.

PermaBaseCement Board

2"x 4"Wood Studsor 20 ga. 3-5/8"Metal Studs 16" o.c.

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at least 3/8" and less than 5/8"from ends and edges. EnsurePermaBase is tight to framing.

Joint Reinforcement: Trowelbonding material to completely fillthe tapered recessed board jointsand gaps between each panel. Onnon-tapered joints apply a 6" wide,approx. 1/16" thick coat of bondingmaterial over entire joint. For alljoints, immediately embed 2" alkaliresistant fiberglass mesh tape fullyinto applied bonding material andallow to cure. Same bonding materi-al should be applied to corners, con-trol joints, trims and other acces-sories. Feather bonding materialover fasteners to fully conceal.

FLOORS & COUNTERS

Subfloor or Base: For flooringapplications with 16" o.c. floorjoists, 5/8" tongue and grooveexterior grade plywood or 3/4"tongue and groove exterior gradeOSB may be used. For 19.2" o.c.and 24" o.c. floor joists, 3/4"tongue and groove exterior gradeplywood or OSB must be used.Tilesize for floors with 24" o.c. floorjoists must be 12" x 12" or larger.The joist and subfloor assembly mustmeet L/360 as well as the appropriatecode tables for live and dead loads.

Underlayment:Using a 1/4"square-notched trowel, apply asetting bed of latex-Portlandcement mortar (or thin-set mortar)

to the subfloor or counter base.Immediately laminate PermaBase tosubfloor or base leaving a 1/8"space between boards at all jointsand corners. Leave a 1/4" gapalong walls.

Stagger all joints so that theydo not line up with underlyingsubstrate joints. Fasten PermaBaseevery 8" o.c. throughout boardfield and around all edges whilesetting bed mortar is still workable.Around perimeter of each board,locate fasteners 2" from cornersand not less than 3/8" from theedges. Fill all joints solid withbonding material. On non-taperedjoints such as butt ends, apply a

6" wide, 1/16" thick coat over theentire joint. For all joints, immedi-ately embed 2" fiberglass meshtape fully into applied bondingmaterial; ensure that tape iscentered over joint. Apply bondingmaterial over fasteners to fullyconceal. Remove all excess bondingmaterial and allow to cure.

FLOOR UNDERLAYMENT COUNTERTOP

Fiberglass Mesh Tape(Alkali Resistant)

Cabinet

Plywood

Latex-PortlandCement Mortar

Latex-PortlandCement Mortar

PermaBaseCement Board

Tile

Tile

I-Joists

Plywood

PermaBaseCement Board

Latex-PortlandCement Mortar

Fiberglass Mesh Tape(Alkali Resistant)

Latex-PortlandCement Mortar

ApplicationsAn ideal substrate for exteriorapplications such as:

� Tile applications

� Stucco applications

� Thin brick

� Adhered stone

� Countertops

� Soffit panels

� Sheathing panels

� Decks

� Outdoor kitchens/grills

InstallationGeneral: All framing shouldcomply with local building coderequirements and be designed toprovide support with a maximumallowable deflection of L/360under all intended live (includingwind) and dead loads.

Note: Cut or score PermaBase onrough side of panel. Install tile andtile setting materials in accordancewith current ANSI specificationsand Tile Council of North America(TCNA) guidelines.

Control Joints: For exterior instal-lations, allow a maximum of 16lineal feet between control joints.(For exterior tile applications, controljoints should be spaced a maximumof every 12'.) A control joint mustbe installed but not limited to thefollowing locations: where expansionjoints occur in the framing or building(discontinue all cross furring memberslocated behind joint); when boardsabut dissimilar materials; whereframing material changes; at changesof building shape or structural system;at each story separation. Placecontrol joints at corners of windowand door openings, or follow specifi-cations of architect. Control jointcavity shall not be filled with coatingor other materials.

DECKS

Subfloor: Plywood should besecurely glued and fastened tofloor joists spaced a maximum of16" o.c. Subfloor should be slopedat a minimum pitch of 1/4" perfoot. The floor surface should betrue to plane within 1/8" in 10'.

Underlayment: Using a 1/4"square-notched trowel, apply asetting bed of latex-Portland cementmortar to the subfloor. Immediatelylaminate PermaBase to subfloor,leaving a 1/8" space betweenboards at all joints and corners.Leave a 1/4" gap along walls.Stagger all joints so they do not lineup with underlying substrate joints.Fasten PermaBase every 8" o.c.throughout board field and aroundall edges while setting bed mortar isstill workable.Around the perimeterof each board, locate fasteners 2"from the corners and not less than3/8" from the edges. Fill all jointssolid with bonding material. Onnon-tapered joints such as butt ends,apply a 6" wide, 1/16" thick coatover the entire joint. For all joints,immediately embed alkali resistantfiberglass mesh tape fully intoapplied bonding material; ensurethat tape is centered over joint.Applybonding material over fasteners tofully conceal. Remove all excessbonding material and allow to cure.

Waterproof Membrane: Trowelapply waterproof membrane to theentire surface of the PermaBase,following membrane manufacturer’sinstallation instructions in detail.

WALLS & CEILINGS

Wall Framing: Studs should bespaced a maximum of 16" o.c.Edges/ends of PermaBase parallelto framing should be continuouslysupported. Provide additionalblocking when necessary to permitproper PermaBase attachment. Donot install PermaBase directly overprotrusions from stud plane such asheavy brackets or fastener heads.

Ceiling Framing: The deflectionof the complete ceiling assemblydue to dead load (including insula-tion, PermaBase, bonding materialand facing material) should notexceed L/360. The dead loadapplied to the ceiling frame shouldnot exceed 10 psf. Ceiling joist orfurring channel should not exceed16" o.c. (Edges of PermaBaseparallel to framing should becontinuously supported.) Provideadditional blocking when necessaryto permit proper PermaBaseattachment.

Exterior Applications

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Weather Barrier:WhilePermaBase is unaffected bymoisture, a water barrier must beinstalled to protect the cavity. Itshould be installed according tothe manufacturer’s specifications.

PermaBase Cement Board:Apply PermaBase with ends andedges closely butted but not forcedtogether. Stagger end joints insuccessive courses. Drive fastenersinto field of cement board first,working toward ends and edges.Space fasteners maximum 8" o.c.for walls, 6" o.c. for ceilings withperimeter fasteners at least 3/8"and less than 5/8" from endsand edges.

Joint Reinforcement: Trowelbonding material to completely fillthe tapered recessed board jointsand gaps between each panel. Onnon-tapered joints apply a 6"wide, approx. 1/16" thick coat ofbonding material over entire joint.For all joints, immediately embed4" alkali resistant fiberglass meshtape fully into applied bondingmaterial and allow to cure. Samebonding material should beapplied to corners, control joints,trims or other accessories. Featherbonding material over fasteners tofully conceal.

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DescriptionCement Board Stucco is a water-managed exterior wall systemdesigned to provide increased high-impact and weather resistance andimproved dimensional stabilitywhere exterior insulation value isnot required. For the purposes ofmeeting structural racking or firecode requirements, it is appliedover the following approvedsheathings: Exposure 1 or exteriorplywood (grade C-D or better);Exposure 1 OSB; glass mat gypsumsubstrate meeting ASTM C 1177;or water resistant core gypsum(ASTM C 1396).

It combines the strength and dura-bility of PermaBase Cement Boardwith the performance and beauty ofreinforced base coats and texturedfinishes.All finishes are available ina limitless color selection andoffer performance enhancementoptions ranging from extra mildewresistance to added flexibility.

Behind the system, a weather-resistant barrier complying withASTM D-226 protects approvedsheathings and other structuralcomponents and serves as acomponent to evacuate incidentalwater. Cement Board Stucco allowsyou to enclose and finish a projectin as little as two days, speedingoccupancy.

UsesFor high-impact and weather-resis-tant exterior wall in residential andlow-rise commercial applications.

AdvantagesDurability/Strength:Moistureresistant, durable PermaBaseCement Board substrates appliedover a primary sheathing provideextraordinary impact and punctureresistance to the system.

Weather Resistance: 100%Acrylic base coats and finishes repelweather at the system’s surface.

Water-Managed Design: Thewater-managed design of thesystem provides drainage to theexterior of incidental water thatmight enter around or throughwindow or door openings andpenetrate behind the cladding inframe construction.

Water-Managed, High-Impact ResistantWall System

Design Options: Cement BoardStucco provides the popular stuccolook, including the attachment ofspecial pre-molded shapes and awide variety of finish texture andcolor options in standard colorsand custom colors.

Contact exterior coatingsmanufacturer for color andinstallation instructions.

Limitations� Use is limited to residential andlow-rise commercial applications.

� Thin veneer construction will tendto reveal planar irregularities inthe frame construction.

� Minor cracking at joints mightbecome visible in the finishedexterior surface.

� For exterior finishes applieddirect to PermaBase, reinforcingmesh must be embedded inbasecoat. Consult exteriormanufacturer for additionalinstallation requirements.

� For conventional PortlandCement plaster systems,self-furring metal lath mustbe used over PermaBase andadhered to studs.

CEMENT BOARD STUCCOWALL 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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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 FRAMINGFire Rating UL Design No. Description

1 hr. U392

1 hr. U392

2 hr. U301

2 hr. U371

1/2" PermaBase applied vertically or horizontally to one side of 3-5/8" steel studs16" o.c. 5/8" Fire-Shield Gypsum Board applied vertically to opposite side. 3" mineralwool insulation in stud cavities.

1/2" PermaBase applied vertically or horizontally over 5/8" Fire-Shield GypsumBoard applied vertically to each side of 3-5/8" steel studs 16" o.c. PermaBasesecured to studs with cement board screws of adequate length to penetrate studs3/8" spaced 8" o.c.

1/2" PermaBase applied vertically or horizontally over 5/8" Fire-Shield Gypsum Boardapplied vertically to each side double row of 1-5/8" steel studs 16" o.c. spaced 6"apart. PermaBase secured to studs with cement board screws of adequate length topenetrate studs 3/8" spaced 8" o.c.

1/2" PermaBase applied vertically or horizontally over 5/8" Fire-Shield Gypsum Boardapplied vertically to each side of 3-1/2", 20 gage steel studs 16" o.c. PermaBasesecured to studs with cement board screws of adequate length to penetrate studs3/8" spaced 8" o.c.

1/2" PermaBase applied vertically over 1/2" Fire-Shield C Gypsum Board, appliedvertically to one side of 3-5/8" steel studs 16" o.c. 2 layers 1/2" Fire-Shield CGypsum Board applied vertically to opposite side. 3" mineral wool insulation instud cavities.

1/2" PermaBase applied vertically or horizontally over two layers 5/8" Fire-ShieldGypsum Board applied vertically to each side of 2-1/2" steel studs 16" o.c.PermaBase secured to studs with cement board screws of adequate length topenetrate studs 3/8" spaced 8" o.c.

1/2" PermaBase applied vertically or horizontally over two layers 5/8" Fire-ShieldGypsum Board applied vertically to each side double row of 1-5/8" steel studs 16" o.c.spaced 6" apart. 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-ShieldGypsum Board applied vertically to each side of 3-1/2", 20 gauge steel studs 16" o.c.PermaBase secured to studs with cement board screws of adequate length topenetrate studs 3/8" spaced 8" o.c.

1/2" PermaBase applied vertically or horizontally to one side of 2x4 wood studs 16" o.c.with 1-1/4" cement board screws spaced 8" o.c. Ceramic tile installed over PermaBase.5/8" Fire-Shield Gypsum Board applied vertically or horizontally to opposite side with6d nails spaced 7" o.c. 3-1/2" mineral wool insulation in stud cavities.

1/2" PermaBase applied vertically or horizontally to each side of 2x4 wood studs16" o.c. with 1-1/4" cement board screws spaced 8" o.c. Ceramic tile installed overPermaBase. 3-1/2" mineral wool insulation in stud cavities.

1/2" PermaBase applied vertically over two layers 5/8" Fire-Shield Gypsum Board,applied either horizontally or vertically to each side of 2x4 wood studs 16” o.c.PermaBase secured to studs with cement board screws of adequate length topenetrate studs 3/4" spaced 8" o.c.

1/2" PermaBase applied vertically over either two layers 5/8" Gypsum Board, appliedeither horizontally or vertically to the interior side of 2x4 wood studs 16" o.c., or over5/8" Gypsum Sheathing applied to exterior side with portland cement stucco, brickveneer, thin brick finishes. PermaBase secured to studs with cement board screws ofadequate length to penetrate studs 3/4" spaced 8" o.c.

1/2" PermaBase applied vertically or horizontally over three layers 5/8" Fire-ShieldGypsum Board applied vertically to each side of 2-1/2" steel studs 16" o.c. PermaBasesecured to studs with cement board screws of adequate length to penetrate studs3/8" spaced 8" o.c.

1-Hour Rating

1/2" PermaBase

Steel studs (with 3" mineral fiber insulation)

5/8" Fire-Shield GypsumWallboard

2-Hour Rating

1/2" PermaBase

Steel studs(with 3" mineral fiber insulation)

1/2" Fire-Shield C GypsumWallboard

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Technical DataFire-Rated Wall Assemblies

PermaBase Cement Board has beentested and/or approved for use in avariety of fire-rated wall systems.

1-Hour Rating – The 1-hour wallassembly consists of 3-5/8" steelstuds, 16" o.c., one layer of 1/2"PermaBase attached horizontally orvertically with 1-1/4" long cementboard screws 8" o.c. in the fieldand perimeter on one side and onelayer of 5/8" Fire-Shield® wallboardattached vertically on opposite sidewith joints staggered to those ofopposite side, with 1-1/4" longdrywall screws 8" o.c. in the fieldand perimeter with 3" thick mineralfiber insulation batts in thestud cavities. UL V452, ITS/WHIReport No. J99-4001.

2-Hour Fire Rating – The 2-hourwall assembly consists of 3-5/8"steel studs, 16" o.c. on one side,base layer of 1/2" Fire-Shield Cwallboard attached vertically with1" drywall screws 24" o.c. in thefield and perimeter and face layer of1/2" PermaBase attached verticallywith 1-5/8" cement board screws,8" o.c. in the field and perimeter.Two layers of 1/2" Fire-Shield Cwallboard applied vertically to theopposite side, base layer attachedwith 1" drywall screws 24" o.c. inthe field and perimeter and facelayer attached with 1-5/8" drywallscrews 12" o.c. in the field andperimeter, with 3" thick mineralfiber insulation batts in the studcavities. All joints staggeredbetween face and base layer.UL V452, ITS/WHI Report No.J98-32931.

PermaBase® BRAND Cement BoardTechnical Data

ShearBondStrength

7days(psi)

PermaBase meets the followingcodes 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 <8byWeight/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 perASTM D 3273 ("Standard Test Methodfor Resistance to Growth of Mold on the Surface of Interior Coatings in an EnvironmentalChamber"), PermaBase achieved a panel score of 10, the highest score possible, indicatingno mold growth under the laboratory test conditions. The use of PermaBase in actualinstallations may not produce the same results as were achieved in controlled laboratoryconditions. No material can be considered "mold proof," nor is it certain that anymaterial will resist mold indefinitely.

DescriptionPermaBase Flex® BRAND CementBoard is a polymer-modifiedcement board reinforced with analkali-resistant fiber mesh ideal foruse around ceilings, beams,columns, arches and archways,walls and anywhere an evenlycurved surface is required.

Applications� Radius wall construction

� Exterior and interior columns

� Barrel ceilings

� Radius shower walls

� Radius tub step-ups

� Radius archways

� Radius stair construction

� Saunas and steamrooms

Features/Benefits� 6" (150 mm) minimum radiusfor 90˚ corners.

� Bends immediately, easily andevenly.

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

� Can be bent without watersaturation or kerf cuts.

� Easy installation, reduces skilledlabor costs.

� Easy to cut and install withscrews.

� Can be used for interioror exterior applications.

� Impact resistant.

� Creates uniform curved surfaces.

� Unaffected by water or moisture.

� Dimensionally stable.

Limitations� For convex surfaces, PermaBaseFlex must be applied with therough surface and taperededges exposed.

� For concave surfaces, PermaBaseFlex must be applied with thesmooth surface exposed.

� PermaBase Flex Cement Boardshould not be used for fire-ratedassemblies.

� Maximum framing spacingshould not exceed 8" o.c. andmust be designed to limitdeflection to less than L/360under all live and dead loads.

� Steel framing must be 20 gaugeor heavier.

� PermaBase Flex should be usedon curved walls and ceilings. Forflat walls and ceilings refer toPermaBase Cement Board.

� PermaBase Flex Cement Boardis vapor permeable and unaf-fected by water but is not awater barrier. Consult localbuilding code for moisturebarrier requirements.

� On exterior installations awaterproof membrane must beapplied behind PermaBase FlexCement Board.

� Do not use drywall nails, screwsor fiberglass mesh tape.

� Maximum fastener spacing shouldnot exceed 8" o.c. for wall and6" o.c. for ceiling applications.

PermaBase Flex makes curved designseasy to achieve. On this indoor pool ceilingapplication, PermaBase Flex is used witha hard coat plaster finish.

PermaBase Flex®BRAND

Cement Board

10

Technical DataPHYSICAL 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.

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InstallationINTERIOR APPLICATIONS

Wall Framing: Studs should bespaced a maximum of 8" o.c.Edges/ends of PermaBase Flexparallel to framing should becontinuously supported. Provideadditional blocking when neces-sary to permit proper PermaBaseFlex attachment. Do not installPermaBase Flex directly overprotrusions from stud plane suchas heavy brackets or fastener heads.

Studs above a shower floor shouldbe either notched or furred toaccommodate the thickness ofthe waterproof membrane or pan.The surround opening for a tub orprecast shower receptor shouldnot be more than 1/4" longer thanunit to be installed.

Ceiling Framing: The deflectionof the complete ceiling assemblydue to dead load (including insula-tion, PermaBase Flex, bondingmaterial and facing material)should not exceed L/360. The deadload applied to the ceiling frameshould not exceed 10 psf. Ceilingjoist or furring channel should notexceed 8" o.c. Edges of PermaBaseFlex parallel to framing should becontinuously supported. Provideadditional blocking when neces-sary to permit proper PermaBaseattachment.

PermaBase Flex CementBoard: Apply PermaBase Flex withends and edges closely butted butnot forced together. Stagger endjoints in successive courses. Drivefasteners into field of cementboard first, working toward endsand edges. Space fastenersmaximum 8" o.c. for walls, 6" o.c.for ceilings with perimeter fasten-ers at least 3/8" and less than5/8" from ends and edges. EnsurePermaBase Flex is tight to framing.

Joint reinforcement: Trowelbonding material to completely fillthe tapered recessed board jointsand gaps between each panel. Onnon-tapered joints apply a 6"

wide, approx. 1/16" thick coat ofbonding material over entire joint.For all joints, immediately embed2" alkali-resistant fiberglass meshtape fully into applied bondingmaterial and allow to cure. Samebonding material should beapplied to corners, control joints,trims or other accessories. Featherbonding material over fasteners tofully conceal.

EXTERIOR APPLICATIONS

Wall Framing: Studs should bespaced a maximum of 8" o.c.Edges/ends of PermaBase Flexparallel to framing should becontinuously supported. Provideadditional blocking when neces-sary to permit proper PermaBaseFlex attachment. Do not installPermaBase Flex directly overprotrusions from stud plane suchas heavy brackets or fastenerheads.

Weather Barrier:WhilePermaBase Flex is unaffected bymoisture, a water barrier must beinstalled to protect the cavity. Itshould be installed according tothe manufacturer‘s specifications.

Ceiling Framing: The deflectionof the complete ceiling assemblydue to dead load (including insula-tion, PermaBase Flex, bondingmaterial and facing material)should not exceed L/360. The deadload applied to the ceiling frameshould not exceed 10 psf. Ceilingjoist or furring channel should notexceed 8" o.c. (Edges ofPermaBase Flex parallel to framingshould be continuously supported.)Provide additional blocking whennecessary to permit properPermaBase Flex attachment.

PermaBase Flex CementBoard: Apply PermaBase Flex withends and edges closely butted butnot forced together. Stagger endjoints in successive courses. Drivefasteners into field of cementboard first, working toward endsand edges. Space fasteners maxi-mum 8" o.c. for walls, 6" o.c. forceilings with perimeter fasteners atleast 3/8" and less than 5/8" fromends and edges. Ensure PermaBaseFlex is tight to framing.

Joint Reinforcement: Trowelbonding material to completely fillthe tapered recessed board jointsand gaps between each panel. Onnon-tapered joints apply a 6"wide, approx. 1/16" thick coat ofbonding material over entire joint.For all joints, immediately embed4" alkali-resistant fiberglass meshtape fully into applied bondingmaterial and allow to cure. Samebonding material should beapplied to corners, control joints,trims or other accessories. Featherbonding material over fasteners tofully conceal.

Control Joints: For interior instal-lations, allow a maximum of 30lineal feet between control joints.For exterior installations, allow amaximum of 16 lineal feet betweencontrol joints. (For exterior tileapplications, control joints should beused a maximum of every 12'.)

A control joint must be installedbut not limited to the followinglocations: where expansion jointsoccur in the framing or building(discontinue all cross furringmembers located behind joint);when boards abut dissimilarmaterials; where framing materialchanges; at changes at buildingshape or structural system; at eachstory separation. Place controljoints at corners of window anddoor openings, or follow specifica-tions of architect.

General: All framing shouldcomply with local building coderequirements and be designed toprovide support with a maximumallowable deflection of L/360under all intended live (includingwind) and dead loads.

Interior Installation

Exterior Installation

110831 Rev. 10/09

Corporate Headquarters

National Gypsum Company2001 Rexford RoadCharlotte, NC 28211

Phone: (704) 365-7300Web: nationalgypsum.com

nationalgypsum.com/espanol

Technical Information

Phone: (800) NATIONAL(800) 628-4662

Fax: (800) FAX-NGC1(800) 329-6421

SpecificationsSection 09 28 00Cement Board

A. This section is written in CSI3-part format and it assumes thatthe general conditions of thecontract will be AIAA201.Thissection is proprietary and includesonly National Gypsum products.

PART 1 GENERAL

1.01 Summary

A. Section includes:

1. Cement backerboard for ceramictile, other interior and exteriorapplications for walls and ceilings.

2.Underlayment for ceramictile installations for interior andexterior floors.

3.Substrate for ceramic tileinstallation for interior andexterior countertops.

1.02 Submittals

A. Product Data: Manufacturers’specifications and installationinstructions for each productspecified.

1.03 Delivery, Storage,and Handling

A. Packaging and Shipping: Havematerials shipped in manufac-turer’s original packagesshowing manufacturer’s nameand product brand name.

B. Storage and Protection: Storematerials inside and protectedfrom damage by the elements.Protect ends, edges, and facesof cement boards from damage.

PART 2 PRODUCTS

2.01 Manufacturer

A. National Gypsum Company

2.02 Materials

A. Cement Board

1.Backer Board: Cementitious,water-durable board; surfacedwith fiberglass reinforcing meshon front and back; long edgeswrapped; and complying withANSI A118.9 andASTM C 1325(PermaBase BRAND Cement 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 greaterthan8%whentested for24hoursin accordancewithASTMC473.

2. Bendable Backer Board:Cementitious, water-durableboard; surfaced with fiberglassreinforcing mesh on front andback; long edges wrapped; andcomplying with ANSI A118.9(PermaBase Flex BRAND CementBoard).

a. Thickness: 1/2"b. Width: 4'c. Length: 8'd. Edges: Taperede. Density: 72 lbs. per cu. ft.f. WaterAbsorption: Not greaterthan 8%when tested for 24 hoursin accordance withASTM C 473.

3. Underlayment: Cementitious,water-durable board; surfacedwith fiberglass reinforcing meshon front and back; long edgeswrapped; and complying withANSI A118.9 andASTM C 1325(PermaBase BRAND Cement Board).

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 greaterthan 8%when tested for 24 hoursin accordance withASTMC 473.

B. Fasteners:

1.Nails: 1-1/2" long, hot dippedgalvanized, for use with woodframing and complying withFederal Specification FF-N-105B,Type 2, Style 20.

2.Screws: PermaBase CementBoard Hi-Lo thread screws (No.8), wafer head, corrosion-resis-tant, 1-1/4" or 1-5/8" long, foruse with wood framing andcomplying with ASTM C 1002.

3. Screws: PermaBase CementBoard drill point screws (No. 8)wafer head, corrosion-resistant,1-1/4" or 1-5/8" long, for use with20 to 14 ga. steel framing andcomplyingwithASTMC 1002.

C. Joint Treatment:

1. Tape:Alkali-resistant fiberglassmesh tape for joint reinforcement,2" wide mesh tape for interiorapplications and 4" wide meshtape for exterior applications.

2.Bonding Materials: Latex-Portland cement mortar or Dry-Set(thin-set) mortar, for joint treat-ment and setting face material,complying with ANSI A118.1 orA118.4 standards.Type 1 organicadhesive meetingANSI A136.1may be utilized for interior use only.

PART 3 EXECUTION

3.01 Installation

A. General: In accordance with man-ufacturer’s recommendations.National Gypsum Company“PermaBase Cement BoardConstruction Guide” and thefollowing standard:

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

3.02 Protection

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

LIMITEDWARRANTYAND REMEDIESProducts manufactured and sold byNational Gypsum Company are warrantedby National Gypsum Company to its cus-tomers to be free from defects in materialsand workmanship at the time of shipment.THIS EXPRESS WARRANTY IS THE ONLYWARRANTY APPLICABLE TO SUCHPRODUCTS, AND IS IN LIEU OF ANDEXCLUDES ALL OTHER EXPRESS ORALOR WRITTEN WARRANTIES AND ALLIMPLIED WARRANTIES, INCLUDING BUTNOT LIMITED TO THE IMPLIED WAR-RANTIES OF MERCHANTABILITY ANDFITNESS FOR A PARTICULAR PURPOSE.

National Gypsum Company will not beliable for any incidental, indirect or con-sequential losses, damages or expenses.The customer’s exclusive remedy for anytype of claim or action for defectiveproducts will be limited to the replacementof the products (in the form originallyshipped) or, at National Gypsum’s option,to a payment or credit not greater thanthe original purchase price of the products.

National Gypsum Company will not beliable for products claimed to be defec-tive where the defect resulted fromcauses not within National Gypsum’scontrol, or which arose or occurred aftershipment, including but not limited toaccidents, misuse, mishandling, improperinstallation, contamination or adulterationby other materials or goods, or abnormalconditions of temperature, moisture, dirtor corrosive matter.

Any claim that products sold by NationalGypsum Company were defective or other-wise did not conform to the contract ofsale is waived unless the customer submitsit in writing to National Gypsum withinthirty (30) days from the date the customerdiscovered or should have discovered thedefect or nonconformance. No legal actionor proceeding complaining of goods soldby National Gypsum may be brought bythe customer more than one year afterthe date the customer discovered orshould have discovered the defect orproblem of which it complains.