Roof Plywood Rot

I would not install plastic on the sheathing because it s a vapor barrier.

Roof plywood rot.

Remove tiles and slate. Locate nails that hold shingles. The asphalt in the felt paper is waterproof and does a great job of protecting the untreated wood roof sheathing. Fungi will not grow on.

Pull up the felt paper underneath the shingles. Set up a ladder at an even location on the ground next to the home. These thin sheets of wood absorb moisture when exposed to it through excess condensation or a roof leak. Most roof decking is made from plywood or a plywood composite known as oriented strand board osb.

How to replace rotted roof plywood sheathing step 1. Climb up and walk carefully onto the roof. During a reroof start at the peak of the roof and remove all shingles prying them up with a pitchfork working your way down the roof. What are different types of roof decking.

Detach the nails that. Working your way up the roof expose all of the rotted wood. In order for fungi to set up shop the wood must be continuously damp. Osb is composed of intertwining wood strands bonded together by a waterproof resin and is a popular option due to its low price point.

Remove all of the shingles using a pry bar or a shingle ripper tool to detach the nails. Remove the shingles over the area of the rotted roof decking identified previously. Wood rot is a form of decay triggered by the combination of moisture and fungi microscopic organisms. Leave the next course of shingles intact by carefully removing the second set of four nails.

Sure there are scenarios where it would not be the roofer s fault inadequate attic ventilation causing rot from below due to attic condensation or frosting wind damage to flashing or broken torn off shingles defective shingles though rare allowing ice snow damming which allows water to back up under the shingles animal chewing into the roof rare leaking ducts or vents physical damage as from falling tree limbs letting moss build up on the roof and more. Generally plywood roof decking that has gotten wet and had the shingles applied over it if allowed to dry out will not be seriously damaged by wood rot fungus organisms. Look up at the roof. When sheathing is exposed to moisture frequently there is always a chance it will decay or develop wood rot.

Gain access to the attic to inspect the plywood or roof decking. And if a home s roof decking is rotting and unable to support the weight of the roof it can cause some very serious structural issues.