Roof Plywood Rot

2 why is rotted plywood decking an issue.

Roof plywood rot.

Although the plywood typically lasts longer than most shingles and roof coverings leaks can cause them to rot. Rotted plywood is identifiable by sinking areas of the roof or visible leaks. 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. Gain access to the attic to inspect the plywood or roof decking.

One of the nice things about plywood is the variety of options you can buy. Plywood is made with an odd number of layers for optimal strength and performance. Locate the rotted roof decking. All roofs have a layer of plywood sheathing underneath them which provides a base for the shingle attachment.

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. What are different types of roof decking. Cover the seams between the old and new decking with bitumen tape. Rotted plywood can cause a number of issues.

Lay felt paper onto the roof overlapping the existing paper to get good coverage. 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. In most instances it is plywood or particleboard.

Once you repair the hole in the roof plywood you need to seal up the seams and recover the roof. 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. Your new board should be the same material. 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.

Note bad areas for removal. Look up at the roof area. Up until 2000 plywood held the majority of the market for wall roof and floor sheathing when it was surpassed by osb which as of 2018 held about 75 of the market share.