Orwigsburg Borough

2 foot. on center and usually covered with . 1/2 inch . plywood sheathing. Wooden I beams consist of a top chord, bottom chord, and a . 3/8 inch . plywood or chipboard stem. Wooden I beam chords are usually made from . 2x4 inch. lumber, however, 2x3 inch. lumber may also be used. Common spacing for wooden I beams is . 2 foot. on center. ................
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