Replacing Roof Boards Plywood

It can withstand moisture for a brief period of time but may become warped and delaminated with consistent exposure to the elements.

Replacing roof boards plywood.

This particular type of plywood is crafted from layers of wood stacked on top of one another with alternating grain patterns in each layer. 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. After the 1960s the predominant residential roofing substrate became 1 2 cdx plywood. Most construction sites will consider the use of either osb or plywood for the roof.

If not climb the roof and measure the opening so you can cut the replacement piece to be a perfect fit. These 8 to 12 inch wide boards were nailed together tight. If not replace bad wood with new plywood sheathing or 1 x 6 sheathing boards whichever is applicable to your type of roof. Today a shiplap roof is usually 60 years old.

Now it s time to replace the roof plywood and any other damaged wood in the roof area. If you were able to keep the removed section in one piece measure it. This is really just a rough draft of the post a collection of photos with captions. Select plywood or oriented strand board that is the same thickness as the wood you are replacing.

I ll be on the road for a few months and won t have time to complete these posts until after but for those of you who ve written wanting to see the rest of the project hopefully this is better than nothing. Clamp a 1 by backing board in place and screw the new rafter to it. As roofing contractors in seattle we are often asked why do we need plywood over our old solid sheathing. If you can see original wood shingles on the underside of your roof when you re up in the attic you ll need not only to tear everything off but also to install new plywood decking all of which likely adds 5 000 or more to your costs.

The keyword here is solid it used to be standard to use shiplap 1 boards tongue groove or other boards for the roof deck. Screw the rafter to the chimney cleat as well. Protect the edges of the plywood soffit from water penetration with a waxy sealer such as anchorseal. Open spaces form between the once tightly fitted shiplap boards.

Make minor repairs on the roof if it is in good condition. The tear off gets a lot more complicated if you have something other than asphalt up there. Rotted plywood can cause a number of issues.