How to Repair Plywood Subfloor
Repairing Plywood Subfloor is Easy to Do
and Requires Just a Few Basic Tools
Mark J. Donovan
An OSB or plywood subfloor can
quickly become damaged if it becomes exposed to water. Water can easily cause a
plywood subfloor to rot, warp or become punky. In addition, a damaged plywood
subfloor can begin to squeak and buckle the finished flooring. Fortunately the
effort and tools required to repair plywood subfloors is easy to do, albeit you
will first need to lift up the finished flooring material.
Tools Required for
Plywood Subfloor Repair
To repair a plywood subfloor you will
need a skill saw, chalk/pencil, square, tape measure, safety glasses, pry bar,
hammer, screw gun, caulking gun, and a ¾ drill bit.
Plywood Subfloor Areas
First lift up the finished flooring
material and locate the damaged OSB or plywood subfloor areas. Make a large X
over them with a piece of chalk or pencil.
Photo By Mark Donovan
Next, determine where the floor
joists are and use your chalk or pencil and the square to mark out square
sections that encompass the damaged plywood subfloor areas. Make sure your
marks that are parallel to floor joists line up directly over the centerline
of floor joists.
Use the pry bar and hammer to remove nails in the damaged plywood subfloor
Next, use a screw gun with a ¾ bit to drill a test hole into the subfloor,
over one of the damaged areas, to determine the thickness of the subfloor.
After determining the thickness of
the subfloor set the skill saw blade height to the measured thickness.
Use your circular skill saw to cut out the damaged plywood subfloor pieces as
Plywood Subfloor Areas
To complete the OSB or plywood
subfloor repair, visit your local home improvement center and pick up the
necessary sheets of 4x8 pieces of plywood or OSB. In addition, pick up some
1-1/2 or 1-5/8 coarse threaded drywall screws and an adhesive such as Liquid
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Cut the new OSB or plywood sheets to
the appropriate dimensions of the wholes you cut out in the subfloor.
Apply a thick bead of adhesive over each exposed floor joist and then lay the
cut pieces of new plywood subfloor material over the cut out openings.
Use the drywall screws and a screw gun to secure the new plywood pieces to the
repaired subfloor. Make sure the drywall screws screw into the floor joists for
After completing the plywood subfloor repair you can then reinstall the finished
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Related Flooring Information
Tools for Repairing Plywood Subfloors from Amazon.com