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sadiejack 10-26-2013 07:26 AM

New roof ripples
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I had my roof replaced in June (very hot in Texas). The process was not very pleasant ... contractors not showing up, slow (2 and half days...normal roof). I see that there are ripples in the roof that looks terrible. :furious:

What causes this? Should I call the roofer about it?

747 10-26-2013 07:38 AM

wow you got screwed. I'm pretty sure it has to do with the sheathing. If i'm wrong someone will correct me.

joecaption 10-26-2013 07:50 AM

I agree it's not the shingles it's the underlayment.
Could be a few different causes.
To thin a sheathing.
No spacing left for expansion.
Someone did not make sure the sheathing was in the middle of the rafter and may have missed them when nailing.
May be able to figure out what's going on from the attic.
Did the roofer just replace the shingles, or redo the whole roof?
Yes it's common when it really hot to put off doing it when it's to hot or come in really early in the morning, leaving during the hottest part of the day and coming back later.
Step on a hot shingle and it can be destroyed, just trying to cut them when there hot is like trying to cut hot gooey tar.

sadiejack 10-26-2013 07:53 AM

So, does this mean I should get the roof re-done?

They took all of the old roof off, down to the plywood.

joecaption 10-26-2013 08:02 AM

Looks bad but I've never seen it cause an issue.
Not there to look it over but I see no way it's the roofers fault unless you paid for him to replace all the sheathing or he saw an issue while the roof was stripped and failed to mention it to you.

Windows on Wash 10-26-2013 08:33 AM


Not a shingle issue.

They are printing through based on what the decking and underlayment are laying down as.

Big thing standing out or as a red flag to me is venting. What is the venting like? Looks like a hop roof and therefore probably underdone.

joecaption 10-26-2013 09:09 AM

I bet he meant Hip roof.

RVR 10-26-2013 09:13 AM

Looks like its the sheathing due to the fact that the ripples look to be about 8 feet apart.
If they used tar paper as an underlayment, and left it over night with out shingling it, that could be the cause as well.
Over night the paper will ripple with temperature change. They come in the morning, and shingle over the ripples, they will always show.

sadiejack 10-26-2013 09:28 AM

If it was the sheathing, then wouldn't the original roof look like this? The original roof was smooth. So I am thinking the underlayment. I don't care for the looks of this and it may effect future sales prospects. This should be fixed by the roofer correct? It appears to be shoddy workmanship.

joecaption 10-26-2013 09:29 AM

If you push down where it's humped up and it moves it would could be the tar paper.

Gary in WA 10-26-2013 04:36 PM

Check in the attic; OSB;


jagans 10-26-2013 08:18 PM

1. Was the original roof removed?
2. What color was the original roof?

It looks like the sheathing was not properly spaced when it was installed.

I personally disagree with those that say its not the roofers fault if this was a tear off, because he (The roofer) should have let you know it was not spaced and let you know there was a problem before proceeding. The roofer can correct the problem by Kerf Cutting between sheets. Not fun, but it can be done.

Those of you who do commercial work know that it is the roofers responsibility to inspect the deck and let the CG know if the installation is not up to par. I have personally turned down a lot of metal decks that were not properly fastened to the Bar Joists.

sadiejack 10-26-2013 09:05 PM

This roof was a total tear-off. The color and style of the shingles were like the original. Why wouldn't the original roof show ripples if the problem was with the sheathing???

tinner666 10-28-2013 03:33 PM

The old roof probably did have the OSB ends showing, but it wasn't noticed.

cibula11 10-28-2013 03:48 PM

Someone already mentioned this, but get up there or from a ladder, push on the "bumps" and see if they give or if it's hard. If it's hard, it's most likely the sheathing. If you can press down on it, it's the felt paper or ice and water barrier that was run with lots of wrinkles. You can definitely tell when the paper is not run flat on 3 tab shingles.

Regardless, you should definitely be calling back. When you pay for a roofing job, you pay to get it done correctly. Even if the old shingles did the same thing, the roofer should have noted that and fixed if for the new roof.

you might also consider the venting or lack thereof. If the vent in the picture is the only one, there could be a lot of heat causing the sheathing to buckle. Again, that should have been remedied by a roofer.

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