Once you repair the hole in the roof plywood you need to seal up the seams and recover the roof.
How to replace plywood in back porch roof.
An aging wood porch may have decay in the porch boards themselves in the framing that supports it or both.
Lay felt paper onto the roof overlapping the existing paper to get good coverage.
Sand the edge of the cut until the edge tapers onto the surface of the underlying laminate.
Staple it to the roof decking or nail it with plastic capped roofing nails.
Step 6 unroll new roofing felt over the new plywood and extend it at least 3 inches over each edge of the new plywood.
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Cover the seams between the old and new decking with bitumen tape.
Bouncy or springy floors are often the result of inadequate or damaged joists in the middle of.
Place a new plywood board in the same location ensuring the ends align over roof rafters.