Hammer down any large nails that are exposed by the removal.
Roof change plywood.
Install a layer of roofing insulation as recommended by the roofing manufacturer.
Rotted plywood can cause a number of issues.
This is a popular option because it presents homeowners with functional but affordable roof sheathing.
Step 6 unroll new roofing felt over the new plywood and extend it at least 3 inches over each edge of the new plywood.
Most roofs will be sheathed in plywood at least 3 8 inch thick.
A half inch cdx plywood is often used with rafter with 24 inch spacing.
Loads will vary with the pitch of the roof.
Moisture causes wood to rot and rotten wood absorbs water even more readily than fresh wood.
Start from the top of the roof and remove the old shingles along with the flashing underlayment and vents.
Place a new plywood board in the same location ensuring the ends align over roof rafters.
Inspect the underlying roof sheathing for damage and make any needed repairs.
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.