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CERTI-LABEL WESTERN CEDAR ted Treated ProductsCerti-label products can also be treated. Products are available eitherfire-retardant-treated OR preservative-treated. Special care must be taken tofollow the treatment company’s recommended installation instructions.PRESSURE-TREATED FIRE-RETARDANT SHAKES & SHINGLESCEDAR SHAKE & SHINGLE BUREAUPRESSURE-TREATED FIRE-RETARDANT SHAKES & SHINGLESCEDAR SHAKE & SHINGLE BUREAUCerti-Guard Fire-Retardant Treated Western Cedar Shinglesand ShakesNumber 1 Grades of Certigrade shingles, and Premium and Number 1Grades of Certi-Split shakes and Certi-Sawn shakes are available pressureimpregnated with fire retardants. Contact the treatment company fortreatment warranty information, accessory product requirements (includingrecommended fastener types) and application details for treated WesternCedar material. Local code jurisdictions may have additional informationregarding applications in specific areas. Certi-Last CCA Preservative-Treated Western Cedar Shinglesand ShakesCERTI-LASTRPRESERVATIVE TREATED CEDAR SHAKES & SHINGLESCEDAR SHAKE & SHINGLE BUREAUNumber 1 Grades of Certigrade shingles, and Premium and Number 1Grades of Certi-Split shakes and Certi-Sawn shakes are availablepreservative-treated by pressure processes. This product is ideal in areas ofhigh humidity. Specify the Certi-Last treating label for this extra protection.Contact the treatment company for treatment warranty information,accessory product requirements (including recommended fastener types)and application details for treated Western Cedar material.Note: Once Western Cedar shingles and shakes are pressure-impregnatedtreated you must contact the treatment company to determine if a finish,such as paint or stain, is allowable.Certi-label Sidewall Application TipsCerti-label Western Cedarshingle and shake size, exposure,width of joints, width of product,kiln versus air-drying process,moisture content and the localenvironment will all affect theexpansion/contraction of Certilabel Western Cedar sidewallproducts. These factors shouldalways be taken intoconsideration when determiningthe installation details andadequate spacing needed foryour specific project. Consultwith your installer and refer topage 4 for more lateral spacingdetails.Architect: Shope Reno Wharton, Photo: Robert Benson

EXTERIOR NEW WALL CONSTRUCTION4Design and Application DetailsThe instructions given here are not meant tosupercede local code requirements. Checkwith your local building official for theirpreference in your area.Preparation - Be sure that the walls aresmooth, without protuberances. Nail ends orpoints should be removed or pounded flush.Underlayment - The CSSB recommends No.30 felt (ASTM D226 Type II or ASTM D4869Type IV) underlayment material. Apply ithorizontally, with a staple gun, starting at thebase of the wall, with a 2" horizontal overlapwith each succeeding course, and a 6"overlap vertically when starting a new roll.Wrap the No. 30 felt underlayment 4" eachway around both inside and outside corners.Figure 1: StorypoleCorner Boards - Install corner boards(Figure 8) at this time.Number 1 Grade Certi-label Western Red Cedarshingles shall be spaced 1/8” to 1/4” apart(keyways are 1/8” to 1/4” wide). Number 1Grade Certi-label Yellow Cedar shingles shall bespaced 1/4” to 3/8” apart. These joints allow forexpansion and prevent possible “buckling.” Forevery 4" width of dry Certi-label Western Cedarshingle material, the product will expandapproximately 1/8". Therefore space keywaysaccordingly, i.e.12" shingle is expected to haveapproximately 3/8" expansion. Allow minimum1/4" keyway spacing for Number 2 GradeRebutted and Rejointed Certi-label Western RedCedar shingles.Leave a side lap of at least 1 1/2" betweenjoints in successive courses.Flashing - Flashings associated with doors,windows, and penetration details should bein accordance with good building practice.Laying Out - Determine the number ofCerti-label courses by measuring the heightof the wall at the lowest part of thefoundation, from a point 1" below the top ofthe foundation, to the top of the wall. Dividethe height into equal parts, correspondingclosely to the weather exposure, but notexceeding the maximum weather exposurerecommended. Transfer this measurementand the number of Certi-label courses to astorypole (Figure 1), to lay out courses on allother walls. Whenever possible butt linesshould align with tops or bottoms ofwindows or other openings, and forappearance the exposure of the final courseat the top should match those below.Certi-label Western Cedar shingle and shakesize, exposure, width of joints, width ofproduct, kiln versus air-drying process,moisture content and the local environmentwill all affect the expansion/contraction ofCerti-label Western Cedar sidewall products.These factors should always be taken intoconsideration when determining theinstallation details and adequate spacingneeded for your specific project. Consultwith your installer and refer to Figure 2:Spacing Detail.Figure 2: Spacing DetailFigures 3a and 3b: To prevent the wicking of water, which may causestaining, keep a 1/2” clearance between the first course of Certi-label productsfrom all surfaces below.Certi-label Western Cedar wall shinglesDouble coursing1/2" clearance tobottom flashing1/2" clearance tobottom flashingTwo last coursesover flashingMetal flashingBelt trim detail at topof footing wallMetal flashingFigure 3a: FlashingFigure 3b: Flashing

SIDEWALL FASTENER GUIDELINES5NOOverdrivenNOUnderdrivenYESCorrect - flushwith surfaceFigure 4:Nail Driving Detail**Note: some nailmanufacturers offer nailsspecifically for woodshake or shingle sidewallapplication. Contact thenail manufacturer forfurther information toensure the fasteners usedcomply with listedrequirements and arecorrect for yourapplication.NailsTMEach Certi-label Western Cedar shingle or shake should be applied withtwo fasteners. Nails must be stainless steel Type 316 in locations withinfifteen (15) miles of salt water (ref. Stainless Steel Industry of North AmericaWashington DC, www.ssina.com). For locations outside the salt water zone nails must be stainless steel Type 304, Type 316, or hot-dipped zinc coatedgalvanized conforming to a coating weight of ASTM A 153 Class D (1.0oz/ft2). Stainless steel nails, although more expensive, offer the highestdegree of corrosion resistance. Contact the nail manufacturer for furtherinformation to ensure the nails used comply with listed requirements and arecorrect for your application. Minimum nail lengths are shown in the fastenerchart below. In double course applications, the exposed Certi-labelTM WesternCedar shingle or shake shall be face-nailed with two nails (as above), driven2" above the butt line, and 3/4" from each edge.Certi-labelTM Western Cedar shingles wider than 10" require 2 additional nailsand these two nails are driven approximately 1" apart near the center of theshingle.StaplesIf you choose to use staples they must be stainless steel Type 316 inlocations within fifteen (15) miles of salt water. For locations outside of thesalt water zone - stainless steel staples Type 304 or Type 316 must be used.Two staples should be driven per Certi-labelTM Western Cedar shingle orshake with the staple crowns 7/16" minimum horizontal, maximum 3/4"horizontal, to the Certi-label Western CedarTM shingle or shake butt. Staplesare driven in the same location as nails relative to the sides and overlappingCenterline of heart butt line. Certi-labelTM Western Cedar shingles wider than 10" require 2additional staples and these two staples are driven approximately 1" apartnear the center of the shingle.1 1/2"Fasteners should be long enough to penetrate into the sheathing at least 3/4"or all the way through and driven flush with the surface of theKnot orCerti-labelTM Western Cedar shingle or shake. In all applications, staples shallsimilarbe concealed by the course above.defectDO NOT USE ELECTRO-GALVANIZED (EG) FASTENERS. Ensure theFigure 5:fasteners used comply with listed requirements. Nails are preferred, forCourse Alignmentaesthetic reasons, in sidewall application using exposed fasteners.Important Notes:Underdriving or overdriving anyfastener will affect the integrityof the Certi-label WesternCedar sidewall system.Pressure Impregnated TreatedShakes and ShinglesFasteners used with fire-retardant(Certi-Guard ) or preservativetreated (Certi-Last ) WesternCedar shakes or shingles must bestainless steel Type 316. Forspecifics on installation, accessorybuilding materials (flashing, etc.)finishes and maintenance pleasecontact the treatment aters.aspThe information on this page isnot meant for sidewall panelapplications. Please contact themanufacturer for specific paneldetails.The information above is notintended to supersede localbuilding codes.1234Wide Shingle Fastener DetailSingle Course Sidewall FastenersDouble Course Sidewall FastenersProduct TypeProduct TypeNail Type & Minimum LengthCertigrade, R&R andSanded ShinglesType (in)16", 18" and 24" Shingles5d Box 1 3/4or same size casing nailsNail Type & Minimum LengthCertigrade, R&R andSanded ShinglesType (in)16" and 18" Shingles3d Box 1 1/424" Shingles4d Box 1 1/2Certigroove ShinglesType (in)16" and 18" Shingles3d Box 1 1/424" Shingles4d Box 1 1/2Certi-Split & Certi-Sawn ShakesType (in)18" Straight-Split Shakes5d Box 1 3/418" and 24" Handsplit Shakes6d Box 224" Tapersplit Shakes5d Box 1 3/418" and 24" Tapersawn Shakes6d Box 2Certigroove Shingles16", 18" and 24" ShinglesType (in)5d Box 1 3/4Certi-Split & Certi-Sawn Shakes18" Straight-Split ShakesType (in)7d Box 2 1/4or 8d 2 1/27d Box 2 1/4or 8d 2 1/27d Box 2 1/4or 8d 2 1/27d Box 2 1/4or 8d 2 1/218" and 24" Handsplit Shakes24" Tapersplit Shakes18" and 24" Tapersawn Shakes

EXTERIOR NEW WALL CONSTRUCTION6Single CoursingDouble the starting course at the base of thewall (Figure 6). For Number 1 GradeCerti-label Western Red Cedar shingles applywith 1/8” to 1/4” keyway space and forNumber 1 Grade Yellow Cedar shingles,apply with 1/4” to 3/8” keyway spacebetween the Certi-label shingles, giving apronounced individual effect to each course.Offset the side joints in any one course atleast 1 1/2" over joints in adjacent courses(Figure 2).Plywood panelor dimensionallumber sheathingEnlarged toshow detail(Figure 6)Underlaymentshall be No. 30 feltconforming toASTM D226 Type IIor ASTM D4869Type IV.The outer course is applied 1/2" lowerthan the inner course as a drip courseto help shed waterUse a straight edge, nailing it lightly to thewall with the edge at the butt line (to keepcourses straight and level). Check for levelevery 3 or 4 courses.This wall application features concealednailing (Figure 6), with nails drivenapproximately 1" above the butt line of thesucceeding course. For Certi-label WesternCedar shingles up to 10" wide, place twonails in each shingle 3/4” from each edge.With Certi-label Western Cedar shingleswider than 10", drive two additional nailsapproximately 1" apart near the center.Because Certi-label Western Cedar shinglesvary in width there should be little waste. Atcorners, or at door or window frames, youmay have to trim a selected Certi-labelWestern Cedar shingle slightly.The CSSB recommends installing overplywood panel or dimensional lumbersheathing. If other sheathing materials areapproved for use by your local buildingofficial, the holding power of the fastenersshould also be considered carefully.Plywood panelor dimensionallumber sheathingConcealed nailingUnderlayment shallbe No. 30 feltconforming toASTM D226 Type IIor ASTM D4869Type IV.The outer course is applied 1/2" lowerthan the inner course as a drip courseto help shed waterUndercoursing grade shingles*The Cedar Bureau recommends that underlayment shall be No. 30 feltconforming to ASTM D226 Type II or ASTM D4869 Type IV. Check withyour local building official for any questions about alternativeunderlayment materials.Figure 6: Single CoursingNote: All figures depict shingleapplications. DO NOT interlay shingles orshakes with felt on sidewall applications.Architect: Shope Reno Wharton, Photo: Robert Benson

EXTERIOR NEW WALL CONSTRUCTION7Double CoursingTo obtain an attractive wall characterized bywide weather exposures and deep shadowlines, Certi-label Western Cedar shingles andshakes can be applied double coursed. Thismethod offers economy because of the wideexposures of the outer course and the use ofless expensive undercoursing Certi-labelWestern Cedar shingles for the under layer(Figure 7). For double coursing exposuredetails refer to the chart on page 12.In double coursing, the bottom or startercourse is laid triple with two undercourseCerti-label Western Cedar shingles or oneundercourse Certi-label Western Cedarshingle over a wood lath and then the outercourse. This gives the bottom course thesame slant as succeeding courses. All outercourses are applied 1/2" lower than theundercourse (Figure 7). A straight edge canbe used to facilitate placement and nailing ofboth the undercourse and exposed course.Undercourse Certi-label Western Cedarshingles are fastened at the top with one nailor staple in the center. The exposed Certilabel Western Cedar shingle or shake is facenailed with two casing-type nails, drivenapproximately 2" above the butt line, 3/4"from each edge. With Certi-label WesternCedar shingles wider than 10" drive twoadditional nails approximately 1" apart nearthe center.Number 3 or undercoursinggrade Certi-labelWestern Cedar shinglesPlywood panelor dimensionallumber sheathingUnderlayment shallbe No. 30 feltconforming toASTM D226 Type IIor ASTM D4869Type IV.The outer course is applied½" lower than the inner courseas a drip course to help shed waterApply nails instraight line approximately 2"above shingle buttsDouble undercoursingFigure 7: Double CoursingNote: Keyway spacing between Number 1 Grade Certi-labelWestern Red Cedar shingles shall be 1/8" – 1/4";Yellow Cedar shingles shall be 1/4" - 3/8".The CSSB recommends installing overplywood panel or dimensional lumbersheathing. If other sheathing materials areapproved for use by your local buildingofficial, the holding power of the fastenersshould also be considered carefully.Architect: Tanner and VanDine Architects, Photo: Mark Citret

EXTERIOR NEW WALL CONSTRUCTION8CornersNeatly fitting inside or outside corners areeasily made. It is standard practice to laceoutside corners (Figure 8e). On wideexposures this method requires small nailsnear the Certi-label Western Cedar shinglebutts to tighten and hold the lapped corners.For these corners use only nails that arecorrosion resistant. In double courseapplications, the exposed Certi-label WesternCedar shingle or shake shall be face-nailedwith two hot-dipped galvanized or stainlesssteel casing nails, driven 2” above the buttline, and 3/4” from each edge. Certi-labelWestern Cedar shingles wider than 10”require 2 additional nails and these two nailsare driven approximately 1 inch apart nearthe center of the shingle. Corner boards alsocan be used to advantage by nailing a 1 x 4cedar board to a 1 x 3 cedar board, thenattaching the preassembled corner to thebuilding (Figure 8a).It is good practice to use flashing behindCerti-label Western Cedar shingles or shakesat the inside and outside corners. They maybe butted against a square wood strip(Figure 8b), or they may be fitted one courseto the other (Figure 8d). When the lattermethod is used, courses must be completedon each wall progressively, and can be bestapplied by working from the corners whilealternately fitting one course to the other.(Figure 9)1x41x3bacdea) Certi-label Western Cedar shingles butted against c) Mitered cornercorner boardsd) Laced inside corner with flashing behind insideb) Certi-label Western Cedar shingles butted againststrip on cornersquare wood strip, flashing behinde) Alternated laced outside cornerFigure 8: Corner Option DetailsIt is preferred practice to installinside/outside corner flashing tosafeguard against the crackingor tearing of No. 30 feltunderlayment at these corners.Figure 9: Fitting Laced Corner Courses

EXTERIOR NEW WALL CONSTRUCTION9Design and Application InstructionsStaggered Butt CoursingFor single course application, an attractiveeffect can be made by staggering the butt ofthe Certi-label Western Cedar shingle fromthe horizontal line. Apply the Certi-labelWestern Cedar shingle irregularly at variabledistances below (but not above) thehorizontal line.Staggered butt applications are made byshortening the exposure less than thegreater maximum exposure. No Certi-labelWestern Cedar shingles or shakes shall beapplied greater than the maximum exposureallowed. Check with local building codes forapproval of the staggered butt coursinginstallation method.1" max. for 16" &18"Certi-label WesternCedar shinglesPlywood panelor dimensionallumber sheathing1 1/2" max. for 24"Certi-label WesternCedar shinglesUnderlayment shallbe No. 30 feltconforming toASTM D226 Type IIor ASTM D4869Type IV.The outer course is applied 1/2" lowerthan the inner course as a drip courseto help shed waterDouble starter courseNote: Keyway spacing-between Number 1Grade Certi-label Western Red Cedarshingles shall be 1/8” – 1/4”; Yellow Cedarshingles shall be 1/4” - 3/8”.Figure 10: Staggered CoursingButt nail all double coursed Certi-label WesternCedar shingles that are exposed more than theirmaximum single course exposure.Architect: Alfredo De Vido Associates, Photo: Paul WarcholRibbon CoursingA double shadow line effect can be obtainedby raising the outer course Certi-labelWestern Cedar shingles approximately 1"above the undercoursing. Use Number 1Grade Certi-label Western Cedar shingles forundercoursing when applying ribboncoursing (Figure 11).Plywood panelor dimensionallumber sheathingUnderlayment shallbe No. 30 feltconforming toASTM D226 Type IIor ASTM D4869Type IV.Finished courseDouble starter courseThe outer course is applied 1/2" lowerthan the inner course as a drip courseto help shed waterFigure 11: Ribbon Coursing

EXTERIOR OVER-WALL AND RE-WALL CONSTRUCTION10Design and Application InstructionsFurring if requiredRe-wallingOnce the old exterior wall material has beenremoved and the old nails or otherprotrusions cleaned away, the new wall canbe applied. No. 30 felt underlayment shouldbe applied since it is new construction.Over-wallingApplying Certi-label Western Cedar shinglesor shakes right over an old wall - whetherwood, brick, stucco, or synthetic products - iseasily done. It saves time involved in bothremoving the old exterior and in disposing ofit. However, avoid nailing over vinyl oraluminum as they are not sufficiently strongto provide a proper support.First, nail moulding strips on the face ofexisting window and door casings, flush withthe outer edges. The Certi-label WesternCedar shingles or shakes are then joined tothe mouldings (Figure 12).Over Beveled Siding - Applying a newCerti-label Western Cedar shingle or shakewall over old beveled siding can beaccomplished in either of two ways: 1) Byfilling in the low points of the wall with lowgrade lumber or plywood strips (calledhorse feathers) of appropriate thickness andthereby increasing the potential nailingsurface, or 2) by nailing the Certi-labelWestern Cedar shingles or shakes to the highpoints of the bevels of each course of the oldwall, or of alternate courses (provided itdoes not result in weather exposure greaterthan is recommended (Figure 13).Ensure that the first course is properlyattached. All Certi-label Western Cedarshingle and shake product installation mustmeet nailing and exposure guidelines asdetailed in this manual. It may be necessaryto add occasional nailing strips.Over Masonry or Foam Sheathing Masonry walls are easily covered, byvertically furring the walls and applyingnailing strips (1 x 3 or 1 x 4) spacedaccording to the exposure and single/doublecourse product design. When installing overmasonry, the nailing strips should befastened with

Application Notes Note: This manual replaces all previous versions of the "Cedar Shake and Shingle Bureau Design and Application Manual for Exterior and Interior Walls" This manual is intended for use with Western Red Cedar and Alaskan Yellow Cedar shingle and shake applications only. Western Red Cedar products manufactured by CSSB members are labeled with the "Certi" brand name .