Cover the patch with a sheet of cling film saran wrap or use a plastic grocery bag.
How to fix a hole in sub floor.
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.
Birch plywood is extremely smooth with no surface voids visible grain or high sections.
Before fixing the subfloor under the carpet you ll need to figure out why the subfloor became damaged in the first place.
Cover the entire area where the vinyl.
Remove the board and insert a new sheet in.
Measure and cut plywood as needed to cover the damaged area.
Repeat on the other parallel exposed joist.
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.
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.
Cover that with a few thicknesses of paper toweling.
These boards will now support the new plywood that you re going to cut to replace the damage.
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.
The first step is to put some dead wood underneath the hole so you have a way to secure the patch.
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.
Remove the screws when replacing a full sheet of subfloor.