Replace Roof Sheathing and Truss Questions
Posted: Mon Aug 28, 2017 8:11 am
We have a mid 80s manufactured home. I am in the process of replacing the shingles. I have some concerns about the integrity of the sheathing and trusses because there is some waviness in the shingles. I took a picture to show, but it doesn't come out clearly in a picture. The house has two layers of shingles and not much in the way of venting. No gable vents, no turbine vents, just two low profile vents. There is a gap at the top where it may, at one time, had a ridge vent, but I don't see any signs that it did. Even if it did, it was covered by two layers of shingles so it wasn't venting anything.
I tore some shingles off to get an idea what lies beneath. Although the sheathing looks clean and dry, it definitely has a bit of sag to it. I pulled one up that was around a skylight I am removing to see how things look underneath. I placed a level on one of the trusses and you can see a sag below.
On the bottom of the sheathing I noticed some mold. Nothing I would say that is terrible, but there none the less.
With this in mind, can someone provide some advice on the following questions.
1) should I replace all the sheathing?
2) if yes, should I upgrade it from 7/16 to 1/2? I figured this would help with future sagging.
3) Should I do anything to deal with the sagging or just shim to give the sheathing something to lay on?
Thanks
I tore some shingles off to get an idea what lies beneath. Although the sheathing looks clean and dry, it definitely has a bit of sag to it. I pulled one up that was around a skylight I am removing to see how things look underneath. I placed a level on one of the trusses and you can see a sag below.
On the bottom of the sheathing I noticed some mold. Nothing I would say that is terrible, but there none the less.
With this in mind, can someone provide some advice on the following questions.
1) should I replace all the sheathing?
2) if yes, should I upgrade it from 7/16 to 1/2? I figured this would help with future sagging.
3) Should I do anything to deal with the sagging or just shim to give the sheathing something to lay on?
Thanks