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Block a Straightedge for Crooked Walls
You could plumb a wall by simply setting your level against the stud, but it wouldn’t give you an accurate reading unless the stud was perfectly straight and smooth. The method shown spans irregularities in the stud and allows you to align the top and bottom plates exactly plumb with each other. Make sure the spacer blocks are the same thickness and that the board they’re attached to is perfectly straight. Check to make sure your setup is accurate by flipping it end for end. You should get the same reading on the level. If not, the straightedge may be crooked.
SPACER BLOCK DETAIL
Plumb walls using a straight board with spacer blocks of equal thickness nailed to each end.
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