Information on wall and ceiling framing and floor framing selections, planning, installation, maintenance, and repair
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Q: The I-joists in my two-year-old house don’t seem very strong. When I use the treadmill in one bedroom, the floor flexes so much that all the dresser drawers open by themselves.
How can I fix this?
—Tom Deiters, Cartersville, GA.
Lay plywood so that its long dimension (the strongest) is perpendicular to joists, rafters, or studs. Stagger the joints, since overall strength suffers when four corners meet.