Plywood Over Tongue And Groove Roof

Tongue and groove boards were used for decades prior to the widespread adoption of plywood as a sheathing material in the 1950s and 1960s.

Plywood over tongue and groove roof.

Old houses with asphalt shingles usually had either tongue and groove boards or straight sided boards abutting. At one point in time it was standard to use shiplap tongue and groove one inch boards or other boards for your roofing deck. Building a structural tongue and groove roof deck. Whenever your roof was first installed the nails were put into the solid wood.

The new plywood thickness should be. These 8 to 12 inch wide boards were nailed together tight. Some use clips as convenient spacers. 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.

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. It doesnt look wavy and 2 other guys said they just would put over t and g. However that isn t the case. If the old plywood had been removed.

Rafters it shouldn t be an issue. Say what you want about them but osb and plywood do not offer a very attractive finished look. The keyword here is solid it used to be standard to use shiplap 1 boards tongue groove or other boards for the roof 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.

Remember the keyword is solid. These wider boards were all nailed tightly together. 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. Do you really need new plywood over tongue and groove.

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 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. Among other things this video covers how we re doing the insulation in a way that leaves the framing and.

One was for a fortune to put new plywood over my existing t and g. 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.