Replace entire roof deck?
Posted: Wed Feb 10, 2010 4:37 pm
I'll try to keep this short - when my 3-piece house was built, the roof underlayment was paper with a few reinforcing fibers, and black spray paint (asphalt, but a really thin coat). My house developed leaks about the third year. Last year (year 7) I replaced about 5 squares of roofing, along both marriage lines. At that time, I replaced the adjacent roof deck sheets with one sheet spanning the gap. I also used Tyvek underlayment, and sealed the roof deck sheet seams with waterproof roof tape. But: I still have leaks. They run down the ceiling (which has plastic above the sheetrock) and pool above the windows, where they eventually leak out.Here is my question -
I think I need to strip off the old roof, at least on the lower sections. I think the underlayment is leaking - I found lots of evidence of tearing, so I think it's pretty worthless.. While I am there, I plan to replace the roof deck with plywood. I'm 220#, and after walking around a bit, I notice that the roof deck starts to get small permanent waves (I'm stepping between the rafters). The rafters are 2x2 on 24" centers, and the deck is OSB. The plywood I spanned the marriage lines with is much better.
I think I can pick away at this, doing one half each summer. My questions are -
Am I on the right track? Should I do the roof deck all the way up (removing my old work and re-doing it)?
I'm planning on using tyvek underlayment, since it seems to breathe but is strong and waterproof. Does this sound like a good way to go?
Thanks!!! Mac
I think I need to strip off the old roof, at least on the lower sections. I think the underlayment is leaking - I found lots of evidence of tearing, so I think it's pretty worthless.. While I am there, I plan to replace the roof deck with plywood. I'm 220#, and after walking around a bit, I notice that the roof deck starts to get small permanent waves (I'm stepping between the rafters). The rafters are 2x2 on 24" centers, and the deck is OSB. The plywood I spanned the marriage lines with is much better.
I think I can pick away at this, doing one half each summer. My questions are -
Am I on the right track? Should I do the roof deck all the way up (removing my old work and re-doing it)?
I'm planning on using tyvek underlayment, since it seems to breathe but is strong and waterproof. Does this sound like a good way to go?
Thanks!!! Mac