Quote:
Originally Posted by MS Fowler
The sagging is likely caused by the original builder building "to Code". The Building Code allowed 3/8 OSB sheathing if clips were placed mid span. In my experience, 3/8 OSB is just not a good sheathing for exactly the reason to are seeing. I prefer a plywood sheathing 1/2 thick. Its a little overkill, but 25 years and my roof is flat while my neightbors all have some amount of sag.
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X2.
About five years ago I had to replace the existing roof on this house. However, I was blessed with cedar shakes and two layers of asphalt shingles on top of that. The cedar was on top of 1x3" stringers, of course.
The work required is to strip it all the way down to the stringers...........and not damage the stringers. Then, since it's 24" on center, I used 5/8" plywood instead of the 1/2". The cost is another $1.00 per sheet. Well worth the additional cost.
It took six guys a period of two full days to do 14 squares. I used the 30 year architectural shingles...........will probably outlast me. Excellent work...........although a bit costly..........$4500. for the labor. I bought all the material and provided it to them.