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Old 10-28-2013, 04:49 PM   #16
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New roof ripples


If the old roof was organic shingles and the new fiberglass that could explain it too.
Organic shingles were a lot stiffer, hid imperfections in the deck a little more. Fiberglass shingles show every bump, they're very soft.

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Old 10-28-2013, 04:54 PM   #17
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This is the reply I got from the roofer:

Hi. It looks like the rafters are visible. It's very common. The original builder used thin decking and ur rafters are 24 inches apart vs 16 inches so it sags a little. Nothing structurally wrong. Without replacing all the decking or adding more rafters, there's little to be done.

So why didn't the original roof look like this??? It is a rafter issue, then the original roof should sag too but it didn't
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Old 10-28-2013, 05:04 PM   #18
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This is the reply I got from the roofer:

Hi. It looks like the rafters are visible. It's very common. The original builder used thin decking and ur rafters are 24 inches apart vs 16 inches so it sags a little. Nothing structurally wrong. Without replacing all the decking or adding more rafters, there's little to be done.

So why didn't the original roof look like this??? It is a rafter issue, then the original roof should sag too but it didn't
Thats crap. If a roof is 24 inches on center. You won't have a ripple it will be like wavy. Its hard for me to put into words. It wouldn't look like this. Finally its the roofer RESPONSIBILITY to inform you if sheathing needs to be replaced. This guy is blowing smoke up your ass.
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Old 10-28-2013, 05:11 PM   #19
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Sorry, I am not a roofer, so I would like to get the terminology straight!!

Sheathing is same as decking?
Underlayment is same as ??

Thanks

Yeah...I had a real hard time with this guy from the get-go. He was trying to get MORE $$ from the insurance company saying the appraised squares were off... so he ordered a Sky report(??) and the insurance company would not adjust the numbers. So he did the work anyway as a "favor" to me...

I had a bad feeling about him to begin with and how that has been borne out.

What is my recourse if he won't fix it?
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Old 10-28-2013, 05:24 PM   #20
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Ridging is often a problem when organic felt is used and it is allowed to get wet, especially if they use No. 30. (ASTM D-226 Type II) The thing that is strange about yours is the fact that the ridges appear to be right at 4 ft horizontally, and 8 ft. Vertically staggered. This would suggest sheathing that was not spaced to allow for expansion. Is it possible that the sheathing got wet, or even damp before they installed the underlayment? Did they tear off your roof and then tarp it overnight? This could have caused significant condensation under the tarp which wet the sheathing, leading to buckling.

Do you have good under deck ventilation in this roof assembly?
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Old 10-28-2013, 05:27 PM   #21
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Yes, they torn off the roof and left it over 2 nights... it was dry weather though. I don't know anything about the venting. It was the builder's roof. House is 13 years old.
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Old 10-28-2013, 05:43 PM   #22
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It's not the rafters showing because the ridges does not go from the top to the bottom of the roof.
All this could be figure out in about an hour if someone just removed a few rows of shingles where it's humping and going in the attic to take a look.
Just standing on the ground and blowing smoke does nothing.
Only way the sheathing would be to thin is if someone used 3/8 or the rafters where more then 24" on center and they used 1/2.
If there 24" on center and 1/2 was used, it meets code in most areas so he had no obligation to mention it.
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Old 10-28-2013, 06:01 PM   #23
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Yes, they torn off the roof and left it over 2 nights... it was dry weather though. I don't know anything about the venting. It was the builder's roof. House is 13 years old.
Please elaborate. Did they tarp the roof? You dont mean to say that they removed the roof and left the sheathing bare do you?

Yes sheathing is a generic term. It can be tongue and groove boards, Plywood or Oriented Strand Board (OBS) In your case you most likely have 4 x 8 foot sheets of Plywood or OSB. If you go in the attic you should see a stamp on the back of each sheet. Photo one of these and post an image.
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Old 10-28-2013, 06:08 PM   #24
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Can you get into attic under this section and take some pics. Especially where you see sheathing meeting in-between the rafters.

Underlayment= felt or synthetic

Sheathing=plywood or osb.
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Old 10-28-2013, 06:11 PM   #25
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I will try...

The roofer just came by (saw his truck out front) ... not sure if he got on the roof (did not hear anything) and he left. Was here about 5 min. Did not contact me or anything....
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Old 10-28-2013, 06:38 PM   #26
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Many prefab trusses are built 24" o.c. That does not explain it. As mentioned above if there was an issue noted by the roofer, it would be his job to inform you of it, so you at least had the opportunity to tell him "yes, I'd like to replace the sheathing" or "No thanks, I'm okay with it".
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Old 10-28-2013, 07:12 PM   #27
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Just talked to the roofer. He stated that the decking was old (13 years) and walking on it may have made it more "indented". So he maintains that the roof replacement is sound and the problem is with the original roof
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Old 10-28-2013, 07:14 PM   #28
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call your contractor back ask him if you did that job for him if he would be satisfied.....he is suppose to know roofing what can and cannot be done and inform you of such even if it cost more....ben sr
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Old 10-28-2013, 07:37 PM   #29
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Just talked to the roofer. He stated that the decking was old (13 years) and walking on it may have made it more "indented". So he maintains that the roof replacement is sound and the problem is with the original roof

If this is the case. Tell him to get his but up in the attic with 24 inch 2x4 and get some support in those section to push it back up. Its still crap. When i had my roof done on house. They got the shingles off and said we have a problem. All sheathing needs to be replaced. I climb up on roof. Old 3/8 inch. I said re sheath whole roof with osb. Point be this. You should have been given the option.

Is a permit required in your town for a new roof. If yes. Get the building inspector to have a look.
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Old 10-28-2013, 07:59 PM   #30
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Just talked to the roofer. He stated that the decking was old (13 years) and walking on it may have made it more "indented". So he maintains that the roof replacement is sound and the problem is with the original roof
This is one of the dumbest excuses I have heard in years.

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