Moisture causes wood to rot and rotten wood absorbs water even more readily than fresh wood.
Roof change plywood.
Install a layer of roofing insulation as recommended by the roofing manufacturer.
Hammer down any large nails that are exposed by the removal.
Rotted plywood can cause a number of issues.
This is a popular option because it presents homeowners with functional but affordable roof sheathing.
Loads will vary with the pitch of the roof.
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.
That will suffice on a roof with rafters set 16 inches apart with minimal roof loads.
Secure the plywood by inserting six penny nails along the rafters spacing them every 6 inches.
Start from the top of the roof and remove the old shingles along with the flashing underlayment and vents.
Inspect the underlying roof sheathing for damage and make any needed repairs.
If your roof carries a heavier load like if there s less pitch and or it snows in your area a roofer may recommend the use of the inch variety.
Step 6 unroll new roofing felt over the new plywood and extend it at least 3 inches over each edge of the new plywood.