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Deducting for Stair Tread and Treated Lumber - Stringer Layout
 

Pay attention here, I'm holding the tape measure at the top of the first stair tread. The tape measure is reading 2 - 5/8 inches, which is the exact amount we need to deduct from the bottom of the stair stringer.

Remember, we have 1 - 1/8 inch thick stair treads and 1 - 1/2 inch treated lumber that are stair stringers will be sitting on top of, to deduct off of the bottom of the stair stringer.

I usually do this to double check my measurements. I can easily subtract 2 - 5/8 inches from 7 - 1/4 inches to find the exact amount that I need to deduct from the top of the first step, but this is just another way that you can double check this particular measurement.

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