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Can a sill plate be larger than 2" thick? I installed a footing to carry a point load. I will be installing 3 LVL's on top of this and then trimmers to support a header. So I need the need to get my footing up to the bottom of the existing joists. I am a couple of inches short. Can I use 4 X 8, or even rip down 6X to get to the height I need? Would I be better off using 2X and furring up with PT plywood?

  • What's the outcome here? Were you able to use Lee Sam's answer? If so, give it a check mark so others know that this is resolved. If not, please write up an answer telling us what you ended up doing an give that one a check mark instead. – FreeMan Jul 20 at 13:27
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Yes, sill plates can be thicker than standard 2x material.

Sill plates are used to transfer the wood framing to the concrete foundation for 1) shear, 2) gravity loading, 3) seismic loading,

That transfer of load is usually fastened with bolts (sometimes metal clips poured into the concrete stem wall). Just make sure the bolts (and washers) are large enough that they don’t bend.

In your case, the solid member is better than the multiple built-up members, but either would work, just make sure the vertical post connection is made to the member connected to the concrete...not just the built-up members.

Btw, only the member touching the concrete needs to be treated.

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