<b>Photo 3: Install underlayment</b></br> Fasten a layer of 1/4-in. plywood underlayment to the old floor with 7/8-in. narrow crown staples using a rented pneumatic stapler. Place staples 4 in. apart in the center of the sheet and 2 in. apart along seams and edges. Stagger the seams, laying full sheets if possible.
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