Repeat on the other parallel exposed joist.
How to fix a hole in sub floor.
Cover the patch with a sheet of cling film saran wrap or use a plastic grocery bag.
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.
Insert a pry bar into the seam between boards and push down on the pry bar to lift the board.
Birch plywood is extremely smooth with no surface voids visible grain or high sections.
Cover that with a few thicknesses of paper toweling.
The i m using two pieces one on each end.
Remove the board and insert a new sheet in.
The first step is to put some dead wood underneath the hole so you have a way to secure the patch.
Measure and cut plywood as needed to cover the damaged area.
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.
Remove the screws when replacing a full sheet of subfloor.
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.
Hammer or screw the birch plywood every four inches along each seam.
Before fixing the subfloor under the carpet you ll need to figure out why the subfloor became damaged in the first place.
These boards will now support the new plywood that you re going to cut to replace the damage.
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.