Roof Sheathing Over Old

Apply new roof sheathing osb directly over old sheathing sagging inch plywood or rip the old sheathing off and apply new sheathing to the trusses.

Roof sheathing over old.

It is now warped and wavy. I have it under contract to resheath and reroof. There does not appear to be any roof leaks but from poking at the sheathing from below there appears to be dry rot. This guide was developed and edited for old homes from original material in the u s.

Today a shiplap roof is usually 60 years old. Attic ventilation comprises of a poorly installed ridge vent with no soffit vents. Sheathing works with other components of the roof as well. The roof is sheathed with either 3 8 or 7 16 inch 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. The contractor has asked if it is possible to leave the old sheathing in place and install the new 5 8 inch sheathing over the top of it. Two questions about replacement of roof sheathing. Roof shingles are to be replaced.

Housing and urban development hud rehab guide. Walking on the roof feels very spongy. 50 year old house with 3 8 plywood sheathing on trusses spaced at 24. Question 1 which is preferable from a quality perspective cost is secondary.

As roofing contractors in seattle we are often asked why do we need plywood over our old solid sheathing. Roof sheathing the material nailed to your trusses or rafters to which your roofing is attached is your roof s workhorse. But can he simply install new plywood over the old. Sheathing is installed over multiple trusses rafters so it essentially turns them into one cohesive unit instead of individual structural members.

Over time shiplap fir wood resin dissipates causing the boards to shrink crack form knot holes and become extremely brittle. The anchor of the system that keeps.