Old Roof Decking

In older houses decking is typically made of lumber place perpendicular to rafters trusses.

Old roof decking.

It s important to know what kind of a substrate is underneath the wood shakes before removing. We knew that this old house had significant gaps in the wood p. It is important for us to point this out because here in maine many historic homes are maintained for both residential and business uses. Until the 1940s exterior grade plywood was not available.

In the first half of the 20th century roofs in missouri were built with wood shingles over planks spaced about 1 apart. Roof decks on homes built before 1970 are often 1 8 fir pre plywood shiplap. If there is a leak in the roof plumbing or windows the mold will reappear if the water is. The new plywood thickness should be.

Plank sheathing usually 1 6 or 1 8 was used as a roof deck before plywood. Strip away the old you re permitted to have two layers of asphalt shingles on your roof so if there s only one in place now you can have a new layer installed right on top. If you remove it all then reinstall you can have cracking and popping of the drywall ceiling. Old houses with asphalt shingles usually had either tongue and groove boards or straight sided boards abutting.

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. Plywooding over old roof deck one thing to consider when stripping off the old plywood is to remove and replace as you go. That will save you as much as 1 000 and a fair bit of mess but it means the roofer can t inspect and repair the decking and flashing underneath. Since the boards used for shiplap were manufactured here in the pacific northwest it was still cheaper than plywood up through the 1960s.

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. Older homes may very well have a different type of roof decking than newer structures.