Old Roof Sheathing

If conditions are right new shingles laid over old shingles can be just as attractive and durable as shingles laid on bare sheathing.

Old roof sheathing.

Shingles stain condensation collects and high winds carry roofs wherever they please. Because the plywood roof sheathing under the shingles has become brittle and weak he plans to install new plywood as well as new shingles. The new plywood thickness should be. After the 1960s the predominant residential roofing substrate became 1 2 cdx plywood.

But can he simply install new plywood over the old. Over time shiplap fir wood resin dissipates causing the boards to shrink crack form knot holes and become extremely brittle. The keyword here is solid it used to be standard to use shiplap 1 boards tongue groove or other boards for the roof deck. Never attach roof sheathing with staples.

Putting a safe roof over your head isn t necessarily a one time deal. Sheathing should be a minimum of 19 32 inch thick. Comes in standard 4 by 8 foot sheets is strong. These 8 to 12 inch wide boards were nailed together tight.

8d ring shank nails should be used instead. The anchor of the system that keeps water out the base onto which you nail your roofing the major part of the brace system for your trusses rafters a key piece of the stiffening system that protects your house from earthquakes and blasts of wind. The typical thickness range for sheathing is 3 8 to 3 4 inch. The toh pros offer up their best advice for shingling properly sniffing out leaks and knowing when it s time to reroof an old roof.

Roof sheathing materials plywood. 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. If you re in search of quotes for a roof sheathing job improvenet can put you in touch with up to four local contractors for free. As roofing contractors in seattle we are often asked why do we need plywood over our old solid sheathing.

Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. But you must take care to install shingles correctly so they lie flat. Installation is easier than for a tear off job because you can use the existing shingles as guides for laying the new ones.