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Old 02-12-2012, 02:15 PM   #196
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Wavy roof! Need opinions/advice


A picture of one of the other roofs a few doors down from us... They all look like this. I felt kinda creepy taking pics of the neighbors houses, otherwise I would have walked around and snapped pictures of them all!

The other pic is from a house that we can see from our backyard that is currently under construction.

What I find amusing is that the builder told us they can't even come out to INSPECT our roof until the temperature is CONSISTENTLY in the 80's!!! Yet, it has been in the 30's and 40's here and they are putting up a roof on a new build...
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Old 02-12-2012, 02:43 PM   #197
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You 're second photo reveals another possibilty. felt paper. Although wrinkled felt normally is a more random lump pattern I have seen this condition. If you can reach one push down with your hand ,if it moves fairly easily it could be the felt.Lumpy felt sometimes flattens with increased temps ,although,they may return when temps change.Maybe thats what your builders waiting for.Or his one year warranty to expire.
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Old 02-12-2012, 02:44 PM   #198
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Wavy roof! Need opinions/advice


That felt has to be removed before roofing or the roof will look horrible.
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Old 02-12-2012, 02:45 PM   #199
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I have never used the product that you have on your roof. I looked at all the pics, and I don't think the problem was with the carpenters. It looks to be a defect of the product. Seems like others near you are having similar issues.
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Old 02-12-2012, 02:57 PM   #200
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Originally Posted by roofscum View Post
You 're second photo reveals another possibilty. felt paper. Although wrinkled felt normally is a more random lump pattern I have seen this condition. If you can reach one push down with your hand ,if it moves fairly easily it could be the felt.Lumpy felt sometimes flattens with increased temps ,although,they may return when temps change.Maybe thats what your builders waiting for.Or his one year warranty to expire.
Look at post 101 of this thread. It is a picture of my roof with just the felt paper on it. You can see it is nice and smooth.
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Old 02-12-2012, 03:05 PM   #201
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Originally Posted by roofscum View Post
You 're second photo reveals another possibilty. felt paper. Although wrinkled felt normally is a more random lump pattern I have seen this condition. If you can reach one push down with your hand ,if it moves fairly easily it could be the felt.Lumpy felt sometimes flattens with increased temps ,although,they may return when temps change.Maybe thats what your builders waiting for.Or his one year warranty to expire.
Also - this roof was put down in early August in Eastern Tennessee. It was 90+ then, and it stayed 80+ for quite some time afterwards (months). I am sure it was warm enough for long enough to flatten out whatever was going to flatten out.
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Old 02-13-2012, 10:58 AM   #202
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I can't remember your attic venting situation, sorry. The paper could be forced to bubble because the exhaust vents are inadequate. The attic space could be under constant positive pressure.This could be from forced or natural pressure called the "stack effect". http://www.wag-aic.org/1999/WAG_99_baker.pdf

Was the attic air sealed before insulation?
Do you have any HVAC units or ducting in the attic?
Is the exhaust/intake ventilation system balanced, or exhaust slightly more?

Gary
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Old 02-13-2012, 12:51 PM   #203
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Is it just me or in the pic with just the felt down, can you see every rafter telescoping through the felt. It looks like parallel lines from eave to ridge. Could that foil sheathing be cooking that felt and swelling it and the rafters are acting as heatsinks to suck it down? That's the sickest thing I have ever seen. It was 16F here in TN this morning, did your roof look any different with it this cold.?
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Old 02-13-2012, 04:12 PM   #204
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I am very Have sticked framed alot of houses. Two things that are causing this to happens their should be at least 5/8 tongue and grove 4x8 sheathing on this roof. I use that on all my houses that have long rafter runs. It far better job. Rafter should be crowned and Poor quaility lumber should be put aside and sent back. There are always going to be some slight imperfections in lumber. In some cases we had to take out an electric planer and take down high spots.

Last edited by roofguy; 02-13-2012 at 04:14 PM.
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Old 02-13-2012, 05:30 PM   #205
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Nobody is putting 5/8 t&g on roofs anymore. If you need a stronger roof, use bigger rafters. Using different sheathing to increase strength is backward thinking.
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Old 02-13-2012, 07:16 PM   #206
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Is it just me or in the pic with just the felt down, can you see every rafter telescoping through the felt. It looks like parallel lines from eave to ridge. Could that foil sheathing be cooking that felt and swelling it and the rafters are acting as heatsinks to suck it down? That's the sickest thing I have ever seen. It was 16F here in TN this morning, did your roof look any different with it this cold.?
Our roof looks exactly the same whether it is 16 or 96.

Not sure how that foil sheathing would be cooking anything on that home that is under construction. The highs have only been in the mid 30's to mid 40's the past 5 or 6 days (since they decked and felted it).
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Old 02-13-2012, 07:24 PM   #207
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Was the attic air sealed before insulation?
Do you have any HVAC units or ducting in the attic?
Is the exhaust/intake ventilation system balanced, or exhaust slightly more?

Gary
Look at post 132 and 133 of this thread. That is a pic of the house very shortly after the roof was put on. The interior of the house is still completely wide open at this point. There is no HVAC at all at this point. Not even sheetrock. Just a wide-open house with every stud visible.

To answer a few of your questions:

There are duct lines that run through the attic. There is a heat pump on the second floor. It is located in a large storage/closet area.

The HVAC system is a mess. We have had several companies come in and we basically need an entirely new HVAC system (2 new units and all new duct-work).

Check out my HVAC thread to read all about that fiasco:
Major pressurization issue
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Old 02-14-2012, 09:38 AM   #208
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the foil facing only works as a radiant barrier only ''if'' it is facing an air space

it can't cook anything
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Old 02-14-2012, 05:35 PM   #209
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Originally Posted by sixeightten View Post
Nobody is putting 5/8 t&g on roofs anymore. If you need a stronger roof, use bigger rafters. Using different sheathing to increase strength is backward thinking.
68,
I've never seen anyone around here use t&g anything on the roofs. I do use 5/8" cdx though on my jobs.
Mike Hawkins
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Old 02-18-2012, 03:10 PM   #210
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I was on a roof today that showed signs of horizontal seam ridging. I saw it from the ground and decided to check it out. Much to my surprise, the ridges appeared to be nothing more than buckling of the roofing itself, not the sheathing. The bulge was hollow undeneath and could be pressed down flat.

Here's my theory.

I know for fact that the sheathing was gapped. It is 3/4" T&G with no clips.

Roofing shingles get nailed above the exposure line which results in a second row of nails near the top of the coarse below it. When these two rows of nails span the seam and the sheets expand to take up the gap, they push toward each other resulting in the buckle.


I'm not saying this is the case in your situation, but thought I'd throw it in the ring.
This is an interesting theory as I'm seeing very defined horizontal lines but I can't place the 8' dimension with any consistency. Is this something that will eventually smooth out with heat?

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