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Discussion Starter · #1 ·
Our contractor told us that they would be replacing all the decking on our roof because we had 3/8" plywood. They would be using 7/16" because the new shingles were heavier and that's more standard these days. On our front porch I notice a ripple/raised area about 6' long and 1' wide. The shingle on the edge of the roof is raised and can see the black tarp liner and under that I see the plywood. Looking at the area, the ripple is where two ends of plywood meet. With our old roof it was completely flat. I asked the contractor if this would go away and he said it was due to the house settling. Our house is 48yrs old and if there wasn't a ripple/raised area before, why would it be there now? I've attached some photos but it is hard to see. In person it is very obvious. Also they pulled our gutters off and they won't be able to get to replacing them for 3 weeks. Does this seem odd not having gutters for 3 weeks? Thanks for any help.
 

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Hard to tell from those pictures.
There is no "black tarp" it's Storm and Ice shield I think your talking about.
Sure looks like someone did not pull it tight before sticking it down to the sheathing.
Also notice there's no drip edging, big 101 roofing mistake.
 

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Discussion Starter · #4 ·
Our front porch roof is about 8' wide and the raised area runs about 7'. When I mentioned it passively, the one contractor said it was from the house settling. It was not there with the old roof, so I wouldn't expect it to be there now. Also with it being raised near the edge, I don't see how it would be protected from water and it looks bad. Thanks again for your comments.
 

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From the middle pic, it appears they installed the OSB over (rather than under) the white existing drip-edge flashing (also on upper roof); starting the sheathing a ways back from the edge of roof. The OSB is covered, you do have the tar paper (30#) lapped over the drip-edge; though this would in itself create a sharp bump there. Other than that, IMO, it will settle down from the sun at a later date.

Gary
 

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My two cents … It could be a bad butt joint with the plywood but I doubt it. I would say that they had a hump in the ice shield and someone just decided to roof over it. You will even see this from time to time with felt paper. Will this correct itself? Nope, if it is a plywood issue it will usually get worse overtime. As for the house settling …. Very poor excuse.

By the way do they need to tear the whole thing off to fix the problem? Probably not
 

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Discussion Starter · #9 ·
you are correct hotrod, the drip edge is lower than the plywood. Basically the plywood ends, there is some space, then the drip edge is maybe attached to the fascia? Then the whole thing is covered with ice and water shield, but it being raised does not form a seal.
 

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well then why is the plywood higher than the fascia, it should be flush. so either theres something under the plywood holding it up or thats the way it was originally, which i doubt. and your right, being raised just creates a problem.
 
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