Featuring Plywood in Buildings - Engineered Wood Products ...

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educes and disguises any surface checking of the face veneer effectively by dispersing or reflectingthe incidence of solar radiation.InstallationTypically, plywood claddingproducts are manufactured to suit1200mm cover with shiplapped orother machines joints, thus thestuds need to be at 600mm or400mm centres. These shiplapjoints allow for some panelmovement. If square edged panelsare used, leave a 2-3mm gapbetween joints on studs toaccommodate panel movement dueto moisture changes.The length of standard plywood cladding products available are 2440mm, 2700mm, 2745mm with3050mm sheets having limited availability. Other panel sizes are available subject to specialenquiry.Plywood claddings are normally installed vertically, but may also be placed horizontally (i.e. longdimension across the studs) if horizontal studs are nogged and detailed to prevent water ingressthrough the joints. Noggings are not required for vertical installation of plywood cladding, unless itis under a horizontal joint. The minimum plywood thickness for external cladding are given in table4 , and the minimum recommended fastener sizes are given in table 5.PlywoodStress GradeTable 4: Minimum plywood thickness (mm) for external claddingStud Spacing (mm)Plywood face grain running Plywood face grain runningverticallyhorizontally400/450 600 900 400/450 600 900F11 12 12 17 8 8 12F14 12 12 16 7 7 12Table 5: minimum recommended fastener sizesPlywood Thickness Up to 7mm Up to 21mmNails to timber 2.8mm dia x 40mm 2.8mm dia x 50mmScrews to timber No.8 x 30mm No.8 x 40mmScrews to steel No.10 x 45mm No.10 x 45mmNotes:1. Nails are flathead, and screws are self drilling countersunk head.2. Fasteners must be no-staining and corrosion protected. For some applications stainless steelor silicon bronze fasteners may be required.12
It is essential in plywood cladding installation that all joints are weatherproofed using shiplappedjoints, battened joints, caulking, flashing timber or elastomeric sealants. Shiplap joints are bestinstalled facing away from the prevailing weather. The use of sisalation or building paper isoptional, however, when butt or horizontal joints are utilised, or the framing is steel, the use of thisextra protection is recommended. Where used, sisalation must be of the vapour permeable type.To allow for movement in the panel due to excessive wetting during rainy periods, a 2-3mm gapmust be provided at all panel edges.Bracing Resistance ofPlywood Exterior CladdingPlywood cladding fixed to timberstud walls, in accordance with allof the requirements of theEWPAA “Structural Plywood WallBracing Manual” (available fromthe EWPAA Web Site) willprovide, depending on spacing’sand connection to the sub floor,from 3.0kN/m of bracingresistance per 900mm of cladwall length.13
Page 4 and 5: Face QualityPlywood can be ordered
Page 7 and 8: Curving PlywoodPlywood can be safel
Page 9 and 10: Lightweight panelsPlywood is strong
Page 11: Plywood Exterior CladdingPreservati
Page 15 and 16: Corner Joint Details15
Page 17 and 18: Plywood Interior Wall & Ceiling Lin
Page 19 and 20: Bracing Resistance of Plywood Wall
Page 21 and 22: Table 8: Fixing of T&G Structural P
Page 23: EWPAA MembersPlywood and Laminated

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