A floor joist end bears on a wood girder. Under conventional wood framing rules, what minimum end bearing should be provided on wood or metal supports?
Correct Answer
A) 1-1/2 in.
Conventional wood framing provisions use 1-1/2 in. minimum end bearing for joists and rafters on wood or metal supports. Other choices understate the bearing, overstate the wood-support bearing, or belong to masonry/concrete bearing conditions.
Why This Is the Correct Answer
Conventional wood framing provisions use 1-1/2 in. minimum end bearing for joists and rafters on wood or metal supports. Other choices understate the bearing, overstate the wood-support bearing, or belong to masonry/concrete bearing conditions.
Why the Other Options Are Wrong
Option B: 3/4 in.
Choice B gives 3/4 in. Its specific error: 3/4 in. is an IBC dimensional value for a different stair, door, or egress condition.
Option C: 2-1/2 in.
Choice C (2-1/2 in.) is rejected because 2-1/2 in. is an IBC dimensional value for a different stair, door, or egress condition.
Option D: 3 in.
In wood framing, 3 in. is the wrong selection for Joist bearing: 3 in. is an IBC dimensional value for a different stair, door, or egress condition.
Memory Technique
Make joist bearing a tabbed card: cite the exact condition, then choose 1-1/2 in.
Reference Hint
Open International Building Code 2021 or 2024; use IBC 2021/2024 conventional wood framing joist and rafter bearing provisions to confirm that Conventional wood framing provisions use 1-1/2 in.
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