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Sill plate
A sill plate is the piece of wood that sits on top of the foundation and connects framing to concrete.
Why it matters
It is the transition between concrete and wood. It needs moisture protection and solid attachment.
Where people get this wrong
Sill plates often need treated lumber depending on code and exposure. A sill gasket can help reduce air leakage at this joint.
Real-world example
A basement has a musty smell and you see dark staining at the bottom of framing. That can happen when moisture management at the sill plate is weak.
Where this hits your build
This shows up during framing. Once walls are up and covered, you lose access. The pre-drywall walkthrough is your window to verify.
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