Use a jigsaw to cut a rounded shape from the plywood to the exact size of the hole.
Hole in roof from inside.
Once the roof patch has dried use caulking to cover the edges and any holes that appear.
Smaller nail holes will be permanently fixed by this method standard roofing nails would be either 3 8 inch or 1 2 inch making a hole.
Walk carefully on the ceiling joists in the attic or use a sheet of plywood to walk on so you will not accidentally put a hole in the ceiling panel.
Water tends to follow along roof rafters or roof decking.
For those who have wondered how to fix a leaking roof from the inside you will see it s fairly simple.
For large patches nail 2 by 4 braces inside the existing rafters with 10 penny nails.
Tiny holes in shingles are sneaky because they can cause rot a leaky roof and other damage for years before you notice the obvious signs of a leak.
Repairing a roof leak from the inside is a temporary fix only.
Once you ve found the leak you can make a temporary leak patch from some plywood or shingle and some roofing tar.
Use a putty knife to spread the tar into the leaking hole on the inside of your roof.
And exposed misplaced roofing repair nails should be pulled and the holes patched.
Make the final repair as soon as weather permits.
You might find holes left over from a satellite dish or antenna mounting brackets or just about anything.
Hold it against the inside of the plywood by pulling up through the hole while driving deck screws through the roof and into the brace.