Rim joist at ceiling rafters
Donald Ross| Posted inEnergy Efficiency and Durabilityon
Here is a wall section image from several houses I built 10 years ago.
2X6 studson 2′ centers. The rafter sits on the joist and rim with 2X6 headers in the wall below.
Considering doubling rim joist over 3′ openings instead.
Looking for input.
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Replies
Works well. The only thing to remember is that if those are attic floor joists, not just ceiling joists, you will need to use hangers on the ones over the openings.
Donald and Malcolm -If the joists and the studs line up, which I have a feeling is Donald's plan, then I think it's fine. No?Having the "headers" in the rim joist is, I think an efficient use of resources, and I have built houses using that approach before.You'll have to strap the ceiling for those 24"o.c. joists, but you probably would have strapped anyway.
Kevin,
If you are agreeing with Malcolm, then I agree with you, too.
If you are contradicting Malcolm's advice about joist hangers, you're wrong. Even if the joists and studs line up, the top plate over a window rough opening can sag unless you have hangers attaching the joists above the rough opening to the rim joist.
Donald, I know that your question doesn't concern the thermal performance of the wall. But the detail would be easier for my eyes to look at if it showed a layer of rigid foam on the exterior side of the studs.
Kevin, strapping ceilings is a regional practice that is seen as necessary throughout the east and not in the west. We frame most of our roofs at 24" and never strap them.
Martin and Malcolm - You guys are right. The house I referred to was built awhile ago(1986) and I forgot the details. The second floor was hung from joist hangers, so that the weight of the second floor gets transferred to the doubled rim and not the plate. Thanks for the correction. Malcolm - The west must have better framing than us on the east. We normally cannot get away without strapping the ceiling.