Osb Over Old Roof

Can new plywood be installed on a 40 year old roof without removing the old.

Osb over old roof.

We are located a bit south of saint louis roof pitch is 5 in 12 if that makes a. Today a shiplap roof is usually 60 years old. The roofing crew uses a red ripper roofing demolition tool to pry up cap shingles which are collected in a plastic bin along with old boot flanges and any loose shingle tabs. The existing asphalt.

After the 1960s the predominant residential roofing substrate became 1 2 cdx plywood. 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. 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. However you might find that osb can better suit your needs than plywood for the roof.

Both cdx plywood and osb tend to come in standard sheets of four foot by eight foot 4 8. Asphalt shingles can be laid over cedar shakes or shingles however this is a roofing project best left to pros. Before you reshingle a roof read our step by step guide for adding new shingles over old ones. Because of its construction some manufacturers actually make larger sheets of osb.

I m halfway though sheeting the roof of my shipping container shop and already need to redo some of it. Fortunately this is one issue that has primarily been standardized by the industry. Anyone aware of code or other issues inherent in this approach. Beveled wood pieces called horsefeathers must be laid along the thick edges of the shakes to make a fairly flat surface.

Open spaces form between the once tightly fitted shiplap boards. Over time shiplap fir wood resin dissipates causing the boards to shrink crack form knot holes and become extremely brittle. I have not been able to locate anything that addresses this point.