Lateral Tests of Wood Roof Sections Sheathed with Lodgepole Pine Decking

Four roof sections, 20 by 60 feet and sheathed with nominal 2-inch decking panels that were fabricated commercially from small pieces of lodgepole pine, were tested in lateral loading. In two roofs, metal shear clips were stapled between rows of decking to resist shear forces, one with “100 percent” and one with “50 percent” clips. In the other two roof sections, 100 and 50 percent elastomeric adhesive was used. Load-deflection curves of these four diaphragms were plotted and compared to two diaphragms, (tested in 1968) sheathed with nominal 3-inch decking. Maximum loads of roof sections with 100 percent shear clips or adhesive were about 1.6 times greater than maximum loads for corresponding roofs with 50 percent shear clips or adhesive. Diaphragms with shear clips were about 15 percent stronger than those with elastomeric adhesive. All four roof sections were two or three times as strong as a similar diaphragm with neither shear clips nor adhesive (just nails).

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