How To Fix A Hole In Sub Floor

Sister a support board for the new plywood take a 2 x 4 or 2 x 6 2 x 8 and screw it into the exposed joist being careful that the top edge aligns with the floor joist.

How to fix a hole in sub floor.

Remove the screws when replacing a full sheet of subfloor. Hammer or screw the birch plywood every four inches along each seam. Remove the board and insert a new sheet in. Measure and cut plywood as needed to cover the damaged area.

Insert a pry bar into the seam between boards and push down on the pry bar to lift the board. The i m using two pieces one on each end. Usually water is the culprit in which case the source of the water leak must be identified and fixed or you could end up with the same problem down the road. These boards will now support the new plywood that you re going to cut to replace the damage.

Measure and cut the plywood use 5 8 cdx plywood to replace the original subflooring. Repeat on the other parallel exposed joist. Cover the patch with a sheet of cling film saran wrap or use a plastic grocery bag. Cover that with a few thicknesses of paper toweling.

Get your wood glue and apply a generous line around the edges of the opening you routed and then a bead along all for edges of your patch and press it into the opening. This exterior grade plywood is a good choice for damp or occasionally wet areas because it can withstand a moderate amount of moisture without deteriorating. I wanted to use the largest pieces of wood i could fit between the joists under the subfloor to disperse over the largest area possible any weight that will eventually be put on this patch. Before fixing the subfloor under the carpet you ll need to figure out why the subfloor became damaged in the first place.