System No. 1
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Finish Flooring: Nom 1 by 4 in. T & G; laid perpendicular to trusses;
or 15/32 in. thick wood structural panels, min grade ôUnderlaymentö or
ôSingle-Floor.öáá Long dimensioned of panel (strength axis)
or face grain of plywood to be perpendicular to trusses with joints staggered.á
Vapor
Barrier: (Optional) û Commercial asphaltá
saturated felt, 0.030 in. thick.
áááááá Subflooring:á 23/32 in. thick wood structure panels.á
Installed perpendicular to trusses with end joints staggered 4ft.á Plywood or nonveneer APA rated panels
secured to trusses with construction adhesive and No. 6d ringed shank nails.á Nails spaced 12 in. OC along each truss.á Staples having equal or greater withdrawal
and lateral resistance strength may be substituted for the 6d nails.á