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The photos above, sent in by a JLC reader, show great examples of how not to frame a roof with wood I-joists. The bottom flange of the I-joist — the part that is most critical for carrying the bending forces — has no bearing, either at the top or the bottom.It will not take a large load for this roof to fail. What will the failure look like? Most likely, at the upper end the I-joist webs will tear away from the top flanges. At the bottom end, the webs will split and the roof will come down.

Sources of Supply

Wood I-Joists

Boise-Cascade

P.O. Box 2400

White City, OR 97503

800/232-0788

Trus Joist MacMillan

P.O. Box 60

Boise, ID 83707

800/628-3997

Georgia-Pacific

2300 Windy Ridge Pkwy.

Atlanta, GA 30339

800/423-2408

Willamette Industries

2550 Progress Way

Woodburn, OR 97071

800/942-9927

Louisiana-Pacific

325 Industrial Dr.

Fernley, NV 89408

800/223-5647


Hangers and Connectors

Simpson Strong-Tie

4637 Chabot Dr., Suite 200

Pleasanton, CA 94588

800/999-5099

United Steel Products

(USP, Kant-Sag, Silver)

P.O. Box 80

Montgomery, MN 56069

800/328-5934, ext. 235