For California residential construction, what is the minimum bearing length required for floor joists bearing on wood sill plates or girders?
Correct Answer
D) 1.5 inches
Per CRC Section R502.6, floor joists shall have a minimum bearing of 1.5 inches on wood or metal and a minimum of 3 inches on masonry or concrete. This bearing requirement ensures adequate load transfer and prevents crushing at the bearing point.
Why This Is the Correct Answer
CRC Section R502.6 specifies that floor joists shall have a minimum bearing of 1.5 inches when bearing on wood or metal supports. This 1.5-inch bearing length ensures adequate load transfer from the joist to the support member and prevents crushing at the bearing point under normal residential loads.
Why the Other Options Are Wrong
Option A: 2 inches
2 inches exceeds the minimum required for wood and metal bearing. While greater bearing length is acceptable, 2 inches is the minimum requirement for masonry or concrete — not for wood sill plates or girders. Confusing the two substrate types is a common error.
Option B: 3 inches
3 inches is the minimum bearing required when floor joists rest on masonry or concrete, not on wood or metal. The higher masonry requirement accounts for the harder, less forgiving surface. Applying the masonry standard to wood bearing is incorrect.
Option C: 1 inch
1 inch is below the code minimum and would be a code violation. Insufficient bearing length could lead to joist rollover or splitting of the bearing point under load.
Memory Technique
Wood is soft, needs less bearing: 1.5 inches. Masonry is hard and unforgiving, needs more: 3 inches. 'Soft wood = less, hard masonry = more.' Or: 1.5 for wood, 3 for stone.
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