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The place do I place my 4″ backside plate on a 6″ curb wall?


I would like so as to add a 6″x6″ curb wall beneath my shed in order that melting snow doesn’t contact the wooden partitions within the spring.

I’ll use 2×4 for the wall studs and I am questioning the place I ought to align the 4″ vs the 6″.

My reflex can be to go middle however then it might go away 1″ on both sides. I am guessing it may create a ridge with the siding or the sheet rock wall not being a full 1″.

I might go together with flush on the surface and a couple of” inside, however then the ridge shall be arduous to overlook inside.

So I suppose I am searching for advices/expertise with that. Is there different cons that I am lacking or factor I ought to take into accout for later ?


[Slab and curb wall](

Comments ( 4 )

  1. Flush to the outside. That way your siding can extend below the bottom plate to protect it. Otherwise you risk creating a lip on the outside that can collect rain which will eventually rot out your bottom plate, or allow water to get inside.

  2. I’m not a huge expert so this may be a bit wrong, but in the end, your full wall construction should overhang the curb just a little bit so water doesn’t try to sit on top of the curb and work its way in.

    Having the 2x4s lined up with the outside face of the curb, your sheathing/siding will then overhang the curb and do that.

    If you put the 2x4s on the inside face, you could have a little ledge on the outside that will collect snow/ice/water, unless you are very careful about putting a chamfer on that curb so there’s always positive drainage away from the wall base.

    Depending on what you’re doing inside the space, the edge of the curb really won’t be much of an issue for anything other than collecting dust. Still easy to put a chamfer on it when forming, or even rounding it with a sidewalk edging tool.

  3. I’m not a professional framer. Have experience in general contacting and estimating mostly. From a quick YouTube video, and from what I’ve seen at sites. Having your plate flush to the outside edge would help prevent water from pooling on the edge. Also remember to use a sill sealer, and treated lumber as your contact plate with the concrete.

    There won’t be much you can do about the edge/seam on the inside, but you could frame 2×6 instead of 2×4, or use a 2×6 bottom plate instead to prevent it. At least it’s a shed, so it’s more about functionality that appeal

  4. Thanks guys, I guess the answer is pretty clear.

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