Plywood Over Tongue And Groove Roof

Do you really need new plywood over tongue and groove.

Plywood over tongue and groove roof.

As roofing contractors in seattle we are often asked why do we need plywood over our old solid sheathing. Say what you want about them but osb and plywood do not offer a very attractive finished look. They said they have to or the roof will be wavy. Whenever your roof was first installed the nails were put into the solid wood.

These 8 to 12 inch wide boards were nailed together tight. At one point in time it was standard to use shiplap tongue and groove one inch boards or other boards for your roofing deck. Tongue and groove roof decking especially the one from solid wood boards is one of the two most common choices for residential use right now. For 5 8 or thicker roof sheathing on 16 o c.

The keyword here is solid it used to be standard to use shiplap 1 boards tongue groove or other boards for the roof deck. 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. The main reason to use tongue and groove boards these days is appearance from beneath the roof. These wider boards were all nailed tightly together.

Some use clips as convenient spacers. However that isn t the case. 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. Remember the keyword is solid.

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. Find all the facts and ideas about it in this article before you install one for your home design. Rafters it shouldn t be an issue. Old houses with asphalt shingles usually had either tongue and groove boards or straight sided boards abutting.

Tongue and groove boards were used for decades prior to the widespread adoption of plywood as a sheathing material in the 1950s and 1960s. The new plywood thickness should be. 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. Among other things this video covers how we re doing the insulation in a way that leaves the framing and.

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. It doesnt look wavy and 2 other guys said they just would put over t and g.