Osb Over Old Roof

I m halfway though sheeting the roof of my shipping container shop and already need to redo some of it.

Osb over old roof.

Can oriented strand board osb be used for roofing. Over time shiplap fir wood resin dissipates causing the boards to shrink crack form knot holes and become extremely brittle. Because of its construction some manufacturers actually make larger sheets of osb. Today a shiplap roof is usually 60 years old.

The existing asphalt. Asphalt shingles can be laid over cedar shakes or shingles however this is a roofing project best left to pros. After the 1960s the predominant residential roofing substrate became 1 2 cdx plywood. Open spaces form between the once tightly fitted shiplap boards.

Beveled wood pieces called horsefeathers must be laid along the thick edges of the shakes to make a fairly flat surface. Anyone aware of code or other issues inherent in this approach. Before you reshingle a roof read our step by step guide for adding new shingles over old ones. However you might find that osb can better suit your needs than plywood for the roof.

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. 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. I have not been able to locate anything that addresses this point. Roy gingrich of ellicott city has a 40 year old house with an asphalt shingle roof surface.

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. 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. Fortunately this is one issue that has primarily been standardized by the industry. Both cdx plywood and osb tend to come in standard sheets of four foot by eight foot 4 8.

Watch this now to learn how to avoid this same pr.