Cut away the damaged area.
Rehabilitate rotten roof plywood.
Water is your roof s number one enemy.
Gain access to the attic to inspect the plywood or roof decking.
Plywood while a bit more expensive than osb is much denser and provides greater protection against moisture.
Think about it before you spend your money.
When replacing roof decking you first need to get rid of the old rotten section.
Set the depth of your circular saw to the thickness of the roof decking.
Osb is composed of intertwining wood strands bonded together by a waterproof resin and is a popular option due to its low price point.
Note bad areas for removal.
So there you go trying to save 1200 2000 on roof replacement by not removing old shingles and not repairing replacing rotted plywood will usually cost at least 4000 6000 more just in few short years.
Locate the rotted roof decking.
Rotted plywood is identifiable by sinking areas of the roof or visible leaks.
Rotted plywood cannot support the weight of a roof the way healthy wood can nor can it safely grip the nails put into the roof and keep them held firm.
Moisture causes wood to rot and rotten wood absorbs water even more readily than fresh wood.
Look up at the roof area.
Rotted plywood can cause a number of issues.
Although the plywood typically lasts longer than most shingles and roof coverings leaks can cause them to rot.
What causes roof decking to rot.
And this does not include any interior damages.