Roof Plywood Rot

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.

Roof plywood rot.

All roofs have a layer of plywood sheathing underneath them which provides a base for the shingle attachment. Once you repair the hole in the roof plywood you need to seal up the seams and recover the roof. Your new board should be the same material. Cover the seams between the old and new decking with bitumen tape.

Prime spots in the attic for wood rot are on the underside of the roof decking in the joints where the wood members connect at the peak of the roof and at the edges of the attic where the. 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. Rotted plywood can cause a number of issues. 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.

What are different types of roof decking. Gain access to the attic to inspect the plywood or roof decking. Look up at the roof area. Rotted plywood is identifiable by sinking areas of the roof or visible leaks.

In most instances it is plywood or particleboard. Note bad areas for removal. Once all nails and screws are removed lift the rotted decking board up and off the roof. One of the nice things about plywood is the variety of options you can buy.

Most roof decking is made from plywood or a plywood composite known as oriented strand board osb. 2 why is rotted plywood decking an issue. Moisture causes wood to rot and rotten wood absorbs water even more readily than fresh wood. Osb is composed of intertwining wood strands bonded together by a.

Lay felt paper onto the roof overlapping the existing paper to get good coverage. Staple it to the roof decking or nail it with plastic capped roofing nails. Although the plywood typically lasts longer than most shingles and roof coverings leaks can cause them to rot.