Framing & StructuralQuestion 331 of 700
At the bearing ends of many wood I-joists, what component is often required to prevent web crushing or rotation?
a.Extra roofing felt
b.Web stiffeners (bearing blocks) and/or blocking panels
c.A thicker subfloor
d.Additional drywall screws
Explanation
At supports, I-joist webs can be prone to crushing or the joist to rotation, so manufacturers often require web stiffeners (bearing blocks) fitted in the web and blocking panels or rim board at the ends. Roofing felt, thicker subfloor, and drywall screws do not address I-joist bearing.
Law Reference: 2025 CA Residential Code §R502.11Practice all 700 questions free — no signup required.
Related questions on this topic
- When a bird's-mouth seat cut is made where a rafter bears on the top plate, what limits how deep that notch may be cut?
- CALCULATION: A hip rafter runs diagonally across the plan corner of a roof. Compared with a common rafter having the same rise, the hip rafter is:
- On a wood I-joist, where may holes generally be cut, and which part must never be cut or notched?
- For laminated veneer lumber (LVL) and glued-laminated (glulam) beams, where must any holes or notches be located and sized?
- A glued-laminated (glulam) beam is stamped 'TOP' along one edge. Why must it be installed with that face up?
- What minimum bearing length is commonly required at the ends of engineered wood floor members unless the manufacturer specifies otherwise?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against California CSLB General Building (B) Trade Examination · How we review