Plywood Over Tongue And Groove 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.

Plywood over tongue and groove roof.

Whenever your roof was first installed the nails were put into the solid wood. If the old plywood had been removed. Some use clips as convenient spacers. One was for a fortune to put new plywood over my existing t and g.

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. It doesnt look wavy and 2 other guys said they just would put over t and g. The new plywood thickness should be. As roofing contractors in seattle we are often asked why do we need plywood over our old solid sheathing.

Find all the facts and ideas about it in this article before you install one for your home design. However that isn t the case. Do you really need new plywood over tongue and groove. At one point in time it was standard to use shiplap tongue and groove one inch boards or other boards for your roofing deck.

Remember the keyword is solid. These wider boards were all nailed tightly together. Tongue and groove boards were used for decades prior to the widespread adoption of plywood as a sheathing material in the 1950s and 1960s. Rafters it shouldn t be an issue.

In the 1950s plywood sheathing and particleboard became common and today most standard construction roofs use either half inch plywood or particleboard s big brother oriented strand board osb. Building a structural tongue and groove roof deck. For 5 8 or thicker roof sheathing on 16 o c. The main reason to use tongue and groove boards these days is appearance from beneath the roof.

In my experience the need for tongue and groove or edge clips is determined by the thickness of the roof sheathing and the spacing of the rafters. If the old plywood was clean and not infested with dry rot or mold it should be ok to cover it with the new plywood. The keyword here is solid it used to be standard to use shiplap 1 boards tongue groove or other boards for the roof deck. Old houses with asphalt shingles usually had either tongue and groove boards or straight sided boards abutting.

These 8 to 12 inch wide boards were nailed together tight. Say what you want about them but osb and plywood do not offer a very attractive finished look.