Understanding
the UL Fire Resistance Directories
Trusses:รกรก Pitched or parallel chord wood trusses, spaced a max of
24 in. OC, fabricated from nom 2 by 4 lumber, with lumber oriented vertically
or horizontally. Truss members secured together
with 0.0356 in. thick galv steel plates. Plates have 5/16 in. long teeth
projecting perpendicular to the plane of the plate. The teeth are in pairs
facing each other (made by the same punch), forming a split tooth type plate.
Each tooth has a chisel point on its outside edge. These points are diagonally
opposite each other for each pair. The top half of each tooth has a twist for
stiffness. The pairs are repeated on approximately 7/8 in. centers with four
rows of teeth per inch of plate width.
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