Roof Sheathing Over Old

The anchor of the system that keeps.

Roof sheathing over old.

Today a shiplap roof is usually 60 years old. Sheathing works with other components of the roof as well. Walking on the roof feels very spongy. The roof is sheathed with either 3 8 or 7 16 inch plywood.

Sheathing is installed over multiple trusses rafters so it essentially turns them into one cohesive unit instead of individual structural members. Question 1 which is preferable from a quality perspective cost is secondary. The keyword here is solid it used to be standard to use shiplap 1 boards tongue groove or other boards for the roof deck. 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.

I have it under contract to resheath and reroof. 50 year old house with 3 8 plywood sheathing on trusses spaced at 24. Roof sheathing the material nailed to your trusses or rafters to which your roofing is attached is your roof s workhorse. This guide was developed and edited for old homes from original material in the u s.

But can he simply install new plywood over the old. 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. Roof sheathing provides an area where the surface material can be attached but it also helps keep the trusses and or rafters properly spaced. It is now warped and wavy.

It is in your best interest to apply solid sheathing over the existing shiplap for your roofing system to securely fasten to. Over time shiplap fir wood resin dissipates causing the boards to shrink crack form knot holes and become extremely brittle. Roof shingles are to be replaced. Attic ventilation comprises of a poorly installed ridge vent with no soffit vents.

Because the plywood roof sheathing under the shingles has become brittle and weak he plans to install new plywood as well as new shingles. Two questions about replacement of roof sheathing.