Roof Plywood Rot

All roofs have a layer of plywood sheathing underneath them which provides a base for the shingle attachment.

Roof plywood rot.

Once you repair the hole in the roof plywood you need to seal up the seams and recover the roof. Rotted plywood can cause a number of issues. Gain access to the attic to inspect the plywood or roof decking. 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.

2 why is rotted plywood decking an issue. Osb is composed of intertwining wood strands bonded together by a. Your new board should be the same material. Look up at the roof area.

Note bad areas for removal. 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. One of the nice things about plywood is the variety of options you can buy.

Cover the seams between the old and new decking with bitumen tape. Locate the rotted roof decking. 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. Once all nails and screws are removed lift the rotted decking board up and off the roof.

Plywood is made with an odd number of layers for optimal strength and performance. What are different types of roof decking. Although the plywood typically lasts longer than most shingles and roof coverings leaks can cause them to rot. 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.

Staple it to the roof decking or nail it with plastic capped roofing nails. Lay felt paper onto the roof overlapping the existing paper to get good coverage. Most roof decking is made from plywood or a plywood composite known as oriented strand board osb.