New Roof Old Plywood

In addition to installing a new roof you might need to.

New roof old plywood.

Over time shiplap fir wood resin dissipates causing the boards to shrink crack form knot holes and become extremely brittle. Open spaces form between the once tightly fitted shiplap boards. Today a shiplap roof is usually 60 years old. As was the case on this roof dry rotted 3 8 plywood would not hold the nails even if they were long enough you could pull them out by hand that is how weak it was.

As long as the new plywood itself can span the distance and carry the roof wind seismic and snow loads for your region adding new ply over old is just fine. Remove any old roofingnails refasten any loose wood and replace any rotten or damaged wood asnecessary to properly install new roofing. Roy gingrich of ellicott city has a 40 year old house with an asphalt shingle roof surface. 5 8 inch 26 87 per sheet.

Replaced wood will cost additional xx for one sheet of 1 2 cdx plywood or x xx per linear foot of 1 x8 board. This means that you must replace old roofing plywood. 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. Sometimes referred to as roof sheathing or a roof deck this plywood acts as a foundation for the layers of underlay and the shingles on your roof and connects the roof to the frame of the house.

The new plywood thickness should be. The existing asphalt shingles need replacement so he plans to do a tear off and re shingle. Be sure to weigh the advantages and disadvantages of each option before you decide which way to go for your new home or your updated roof. One thing to consider is that the new plywood probably wants to be the same thickness as what would be used if it was used by itself on the rafters i e.

The tear off gets a lot more complicated if you have something other than asphalt up there. Cost to install flashing on roof. If the old plywood had been removed. Even though it isn t visible it is very important to the structure of your home.

Here is approximately how much different options cost. Remove the old roof. After the 1960s the predominant residential roofing substrate became 1 2 cdx plywood.