Roof Humps/Uplifts

New construction. Few weeks ago did the house next door. Some of you may remember. It had a truss pulling away from the T1-11 roof sheathing. Anyways this is the house next door same age brand new. At the back was a humped up area of the shingles. Gentle prodding felt like there was a few inches of just dead space behind shingle because of this. Seems like a bad situation and will crack/split over time and leak.
Also I thought these were nail pops but then saw how small they were and was wondering if maybe there was another culprit or issue? This home does indeed have T1-11 as roof sheathing.

I also wasn’t sure if the tar/sealant at the valley was a sign they didn’t use flashing. Considering the hacky crap I’m seeing it wouldn’t surprise me. I can’t see anyway would you comment on it at all?

I am aware they used regular shingles for a ridge cap which is wrong and will def crack and not adhere well over time.

It is a sign that they didn’t know what they were doing on the installation.

It looks like they shingled over the upper roof shingles with the lower roof shingles.

Could you see from inside the lower attic if that was what they did?

Report what you see and refer it out to a qualified roofer for repairs, as needed.


Yes that was my thoughts too on the poor lapping. I could not see from the attic. Limited walkway and many trusses. Also, while I normally walk the roof first in this instance I actually did the roof last because it was very wet with dew when I arrived. I knew it would be bad so I really wanted to walk it.

Chris, a powerful flashlight would tell you what I asked.

It is hard to get around in some attics but, if safe enough to traverse, an inspector can find some important defects.

Good luck!

They clearly didn’t know what they were doing.

Yep, they sure did. Maybe water flows uphill in that neighborhood. :person_shrugging:

Include the word “COMPETENT”. Home owner doesn’t want the same installer to come back and “fix” it. :roll_eyes:


If the same roofer came back to remedy, he certainly wasn’t “QUALIFIED” to begin with. LOL!

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And used the laminate shingles for ridge caps

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Larry, what do you mean by that? Trying to make sense of that in my old head here.

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Not Larry, but I see it too. Appears to be reversed.


Thanks, Tom.

Marcel, It looks like they framed and shingled the addition (if that is what it is) over the top of the existing roof. Kind of like this:



It’s sometimes called a “California-cut” valley. With the California-cut valley, shingles from the smaller roof slope are installed across the valley onto the adjacent slope . A valley shingle is then installed parallel to the centerline and offset a couple of inches.


**Roof Humps/Uplifts**

Oh I get that with no problem, I thought they were talking about the humps.
No wonder I was confused.

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Those ridges are probably wrinkled underlayment. Can happen if the underlayment gets wet before shingles.
Like you said, it can cause accelerated wear and cracking.

Some of the shingles look like they are “fish mouthed”, which is usually from bad nailing, but if the wrinkle is continuous, it is the underlayment.

T1-11 is a siding, are you sure they were using that for roof sheathing?


The whole roofing job looks like it was done by the homeowner’s buddies for a few cases of beer and some pizza.


Yea, but they should have offered it AFTER the job was done not AS it was being done. LOL!


Funny, that’s the part that I winced at…T1-11 would not only be insanely expensive, but not rated for that use either.

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Yes I told my clients not to have the same roofer come back. Their work is obviously poor and they are biased and not going to go out of their way to pay for repairs.

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Southern Ohio has a bad reputation for being shoddy and unregulated in literally everything.


How’s your wife feel about that? LOL!