Securock Glass-Mat Sheathing TM
General 1.1 USG Securock™ glass-mat sheathing meets or exceeds all requirements of ASTM C-1177 Standard Specification for Glass-Mat Substrate for Use as Sheathing. Panels are available in 1/2" and 5/8" thicknesses, 48" wide, and standard lengths of 8', 9' and 10', with square edges. Other sizes are available on special order. 1.
Sheathing Cutting and Application 4.1 Securock glass-mat sheathing may be applied with long dimensions parallel or perpendicular to framing members except where limited by specific requirements. Sheathing orientation may be governed by local code or by the requirements of shear or fire-rated construction. Consult local codes and site-specific construction documents to ensure such requirements are met for every assembly prior to construction. 4.
Soffit Construction 5.1 The roof must be dried-in prior to the installation of sheathing in horizontal applications. Maximum fastener spacing for soffits is 8" o.c. 5.2 5.3 Panels are subject to expansion and contraction due to changes in temperature and humidity. The maxi- mum spacing of control joints shall be 30'. A 1/4" clearance joint is required between Securock glass-mat sheathing panels and adjacent walls, fascia, beams or columns.
