Osb Over Old Roof

However you might find that osb can better suit your needs than plywood for the roof.

Osb over old roof.

Beveled wood pieces called horsefeathers must be laid along the thick edges of the shakes to make a fairly flat surface. Roy gingrich of ellicott city has a 40 year old house with an asphalt shingle roof surface. After the 1960s the predominant residential roofing substrate became 1 2 cdx plywood. Can oriented strand board osb be used for roofing.

Open spaces form between the once tightly fitted shiplap boards. We are located a bit south of saint louis roof pitch is 5 in 12 if that makes a. Oriented strand board isn t plywood nor is it a type of particleboard fiberboard or wafer board and although it is a newcomer to a plywood. We are thinking of nailing 7 16 osb over the existing plywood and making sure the the joints between the layers do not line up.

Because of its construction some manufacturers actually make larger sheets of osb. Anyone aware of code or other issues inherent in this approach. Asphalt shingles can be laid over cedar shakes or shingles however this is a roofing project best left to pros. Can new plywood be installed on a 40 year old roof without removing the old.

Watch this now to learn how to avoid this same pr. Over time shiplap fir wood resin dissipates causing the boards to shrink crack form knot holes and become extremely brittle. I m going a reroof in two weeks time where we are removing all the old roof covering and the old sheathing delaminated and rotted 3 8 plywood and replacing it with new 5 8 t g plywood. Today a shiplap roof is usually 60 years old.

Both cdx plywood and osb tend to come in standard sheets of four foot by eight foot 4 8. I have not been able to locate anything that addresses this point. The existing asphalt. Before you reshingle a roof read our step by step guide for adding new shingles over old ones.

Fortunately this is one issue that has primarily been standardized by the industry.