Roof Change Plywood

Install a layer of roofing insulation as recommended by the roofing manufacturer.

Roof change plywood.

Secure the plywood by inserting six penny nails along the rafters spacing them every 6 inches. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. Start from the top of the roof and remove the old shingles along with the flashing underlayment and vents. A half inch cdx plywood is often used with rafter with 24 inch spacing.

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.

Moisture causes wood to rot and rotten wood absorbs water even more readily than fresh wood. Place a new plywood board in the same location ensuring the ends align over roof rafters. Hammer down any large nails that are exposed by the removal. 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.