Step 6 unroll new roofing felt over the new plywood and extend it at least 3 inches over each edge of the new plywood.
Roof change plywood.
A half inch cdx plywood is often used with rafter with 24 inch spacing.
Secure the plywood by inserting six penny nails along the rafters spacing them every 6 inches.
Loads will vary with the pitch of the roof.
Inspect the underlying roof sheathing for damage and make any needed repairs.
Rotted plywood can cause a number of issues.
This is a popular option because it presents homeowners with functional but affordable roof sheathing.
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.
Place a new plywood board in the same location ensuring the ends align over roof rafters.
Most roofs will be sheathed in plywood at least 3 8 inch thick.
That will suffice on a roof with rafters set 16 inches apart with minimal roof loads.
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.