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Old 01-29-2012, 11:40 AM   #31
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Wavy roof! Need opinions/advice


Wow. Terrible framing. Did they use sheathing clips?

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Old 01-29-2012, 11:52 AM   #32
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Wow. Terrible framing. Did they use sheathing clips?
In post #7 of this thread, you can see a close-up picture of the under-side. There are clips between the deck boards (I assume that is what you are referring to).

I am no roofer, but this certainly doesn't look right to me.
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Old 01-29-2012, 12:04 PM   #33
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It's rather obvious there is a problem with the ventilation and/or insulation, and /or the vapor barrier. Any pics of any of the insulation or ventilation?

I really don't know how they expected that to work with only 3" space for insulation in the ceiling.

Did this house get inspected? What building code was used for the construction?
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Old 01-29-2012, 12:09 PM   #34
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fixing this type of problem is difficult and would involve jacking up your roof trusses from inside the attic ... this was obviously stick built instead of prefab ... other than the asthetics of a horrible looking roof there are no real dangers from this happening.

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North Georgia area
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Old 01-29-2012, 01:40 PM   #35
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It's rather obvious there is a problem with the ventilation and/or insulation, and /or the vapor barrier. Any pics of any of the insulation or ventilation?

I really don't know how they expected that to work with only 3" space for insulation in the ceiling.

Did this house get inspected? What building code was used for the construction?
Hi MJW,

I am not sure what you mean when you refer to the 3" of spacing? And when you mean pics of insulation/ventilation, what specifically are you looking for? Don't mean to ask dumb questions, but I have minimal knowledge about this stuff.

Yes - they house was inspected. The town I live in uses the 2006 International Building Code.
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Old 01-29-2012, 01:43 PM   #36
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Originally Posted by chende9 View Post
fixing this type of problem is difficult and would involve jacking up your roof trusses from inside the attic ... this was obviously stick built instead of prefab ... other than the asthetics of a horrible looking roof there are no real dangers from this happening.

Chris Hendershot
Master Roofer
North Georgia area
Yep -that's the understanding we are starting to come to. There may not be any structural issues here, just the aesthetics. The big problem with that is when we go to sell the house.

The next buyer is going to look at that roof and say, "WHAT THE HECK IS WRONG WITH YOUR ROOF?!?!?! I WANT A LOT OF MONEY OFF THE PURCHASE PRICE TO FIX IT".

So if you were me, what "expert" would you bring in to officially document what is wrong? Would a roofing company be good enough to document that "something" is wrong? Do I need to bring in a general contractor, or some type of house framing specialist/engineer?
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Old 01-29-2012, 03:30 PM   #37
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Originally Posted by stickner

Yep -that's the understanding we are starting to come to. There may not be any structural issues here, just the aesthetics. The big problem with that is when we go to sell the house.

The next buyer is going to look at that roof and say, "WHAT THE HECK IS WRONG WITH YOUR ROOF?!?!?! I WANT A LOT OF MONEY OFF THE PURCHASE PRICE TO FIX IT".

So if you were me, what "expert" would you bring in to officially document what is wrong? Would a roofing company be good enough to document that "something" is wrong? Do I need to bring in a general contractor, or some type of house framing specialist/engineer?
I think you should call in a structural engineer.
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Old 01-29-2012, 04:57 PM   #38
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I think you should call in a structural engineer.
We will add that to the list of people to call in... We are also dealing with big HVAC issues... You can read all about it here:

Major pressurization issue
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Old 01-29-2012, 05:06 PM   #39
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What is the history with this builder? Are they still in business?
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Old 01-29-2012, 05:21 PM   #40
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More than anything else, that is a problem with the sheathing expanding and buckling. You may have a few unruly rafters, but I don't see it. I do see every horizontal and vertical seam of 4x8 sheets. It is without a question in my mind, an issue with improper spacing of the sheets. Those horizontal lines are buckled seems in the sheathing. They cannot be caused by crowning of lumber.
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Old 01-29-2012, 05:48 PM   #41
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Looking at those framing pics, I want to add that I'm hard pressed to criticize anything that I can see from those pics. It looks very clean to me. It's a good possibility that a different crew was there to sheath that building.

It's also possible that the sheathing crew allowed the required spacing and the sheets swelled beyond those parameters. Typically, the clips automatically space the sheets, although I like to open them up slightly more. End spacing is something that few framers do, but is important to avoid the exact issue you are dealing with. Could very well be from excessive moisture in the ventilation cavity, or a lack of one thereof.
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Old 01-29-2012, 07:36 PM   #42
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What is the history with this builder? Are they still in business?
They are. They are actually one of the larger residential AND commercial builders in the area.
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Old 01-29-2012, 07:39 PM   #43
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More than anything else, that is a problem with the sheathing expanding and buckling. You may have a few unruly rafters, but I don't see it. I do see every horizontal and vertical seam of 4x8 sheets. It is without a question in my mind, an issue with improper spacing of the sheets. Those horizontal lines are buckled seems in the sheathing. They cannot be caused by crowning of lumber.
Thanks for your input. The more we look at this, the more I think your observation is the correct one. Two questions for you (or anyone else):

  1. Would it be true to say that the only way this can be fixed is to pull everything off (including the sheathing) and start over?
  2. Let's say nothing is done about it, will the sheathing become more and more buckled (warped) each year?
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Old 01-29-2012, 07:40 PM   #44
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Could very well be from excessive moisture in the ventilation cavity, or a lack of one thereof.
Any suggestions on how we can determine if this is an issue?
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Old 01-29-2012, 08:14 PM   #45
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Thanks for your input. The more we look at this, the more I think your observation is the correct one. Two questions for you (or anyone else):

  1. Would it be true to say that the only way this can be fixed is to pull everything off (including the sheathing) and start over?
  2. Let's say nothing is done about it, will the sheathing become more and more buckled (warped) each year?
1. There is no way to address this from underneath, even if it's not insulated and rocked.

2. Depending upon the cause of the condition, it may or may not get more pronounced.

I'm not familiar with that particular product, so I can't comment on it's behavior to certain conditions.

If it is solely from the sheets growing in length and width due to relative humidity, similar products will typically stabilize at a specific point.

It's also a possibility that the sheets are experiencing edge swelling that results in a change in thickness of the product as well. OSB products are more prone to thickness swelling than typical CDX plywood.

There are many variables that could play a role as well. It's possible that the moisture absorption took place before the roofing material was even installed, which would not indicate an ongoing moisture issue.

The bottom line is, unfortunately, that the only way to truly correct this issue is to remove and replace, although a slight chance exists that relieving the cuts would suffice if done correctly and there is no thickness swelling.

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