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Old 01-21-2012, 03:21 PM   #1
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Wavy roof! Need opinions/advice


Hey all - we just has a new home constructed and are having some "issues" with the roof.

There are many noticeable humps and bumps in the roof. After a lot of research, we *think* that the problem is with the rafters.

Specifically, we think that the rafters may be installed with some crown side up and others crown side down. This is causing a "wavy" appearance. Assuming this is what is going on, 2 questions :

  1. What are the dangers of having some rafters crown up and others crown down?
  2. How can this be fixed (I am afraid I already know the answer to this)
If you have any other thoughts on what might be causing this, I am all ears!

Thanks,

Stickner
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Last edited by stickner; 01-30-2012 at 10:12 PM. Reason: update to show one of the pics that was added later in the thread...
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Old 01-21-2012, 03:25 PM   #2
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Wavy roof! Need opinions/advice


Quote:
Originally Posted by stickner View Post
Hey all - we just has a new home constructed and are having some "issues" with the roof.

There are many noticeable humps and bumps in the roof. After a lot of research, we *think* that the problem is with the rafters.

Specifically, we think that the rafters may be installed with some crown side up and others crown side down. This is causing a "wavy" appearance. Assuming this is what is going on, 2 questions :

  1. What are the dangers of having some rafters crown up and others crown down?
  2. How can this be fixed (I am afraid I already know the answer to this)
If you have any other thoughts on what might be causing this, I am all ears!

Thanks,

Stickner

any picture of the roof?

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Old 01-21-2012, 03:31 PM   #3
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Wavy roof! Need opinions/advice


They probably used 7/16" osb over trusses (that rarely sag) spanned 24", as it's the cheapest way to build.
It's normal for the sheeting to sag a little between the trusses.
And it really stands out when there's frost on the roof, as the trusses are the last to melt due to density.
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Old 01-21-2012, 03:31 PM   #4
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Wavy roof! Need opinions/advice


Here are some pictures, but pictures aside, what do you think the dangers are of having some rafters crown up, and other rafters crown down?
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Old 01-21-2012, 03:33 PM   #5
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Wavy roof! Need opinions/advice


There aren't really any major dangers. That is the result of laziness from the framers.
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Old 01-21-2012, 03:35 PM   #6
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Well, since seeing the pictures...
Are these trusses or rafters?
There's no danger even though the board is slightly weaker, just really looks bad.
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Old 01-21-2012, 03:37 PM   #7
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Originally Posted by titanoman View Post
They probably used 7/16" osb over trusses (that rarely sag) spanned 24", as it's the cheapest way to build.
It's normal for the sheeting to sag a little between the trusses.
And it really stands out when there's frost on the roof, as the trusses are the last to melt due to density.
They used solarboard (an OSB product)
http://www.solarbordosb.com/

Here is a pic from when it was under construction.
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Old 01-21-2012, 03:39 PM   #8
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Wavy roof! Need opinions/advice


Quote:
Originally Posted by stickner

They used solarboard (an OSB product)
http://www.solarbordosb.com/

Here is a pic from when it was under construction.
Never heard of such a thing. Must be new within the last 10 years.
Don't like the way they frame any of that either.
Not very good carpenters at all.
Must have been piecework.

Last edited by titanoman; 01-21-2012 at 03:44 PM.
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Old 01-21-2012, 03:41 PM   #9
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Content removed by writer. I don't have knowledge of this type of construction

Last edited by Hardway; 01-21-2012 at 03:45 PM.
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Old 01-21-2012, 03:48 PM   #10
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Quote:
Originally Posted by stickner View Post
They used solarboard (an OSB product)
http://www.solarbordosb.com/

Here is a pic from when it was under construction.
I don't like this construction all ready and know nothing about it!
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Old 01-21-2012, 03:50 PM   #11
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Quote:
Originally Posted by Hardway

I don't like this construction all ready and know nothing about it!
It's called a stick-framed California.
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Old 01-21-2012, 03:59 PM   #12
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Never heard of such a thing. Must be new within the last 10 years.
Don't like the way they frame any of that either.
Not very good carpenters at all.
Must have been piecework.
More pics from when it was under construction.
Attached Thumbnails
Wavy roof! Need opinions/advice-img_2050.jpg   Wavy roof! Need opinions/advice-img_2075.jpg   Wavy roof! Need opinions/advice-img_2076.jpg   Wavy roof! Need opinions/advice-img_5088.jpg   Wavy roof! Need opinions/advice-img_5112.jpg  

Wavy roof! Need opinions/advice-img_5114.jpg  
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Old 01-21-2012, 04:03 PM   #13
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Quote:
Originally Posted by titanoman View Post
Well, since seeing the pictures...
Are these trusses or rafters?
There's no danger even though the board is slightly weaker, just really looks bad.
So here is the real question... Is it bad enough to force the builder to fix it so it doesn't look bad? And I assume trying to fix this problem would be a MAJOR undertaking?

What would you do if it was your house? Do you think I am right with guessing that some rafters are crown up, and others are crown down and that is causing the waviness?
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Old 01-21-2012, 04:11 PM   #14
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Quote:
Originally Posted by stickner

So here is the real question... Is it bad enough to force the builder to fix it so it doesn't look bad? And I assume trying to fix this problem would be a MAJOR undertaking?

What would you do if it was your house? Do you think I am right with guessing that some rafters are crown up, and others are crown down and that is causing the waviness?
The drywall will look just like the roof in that vault.
It may not be an upside-down crown either; some of them may just be crowned more than the others. Those should have been called out, not used.
I don't know where the "splitting hairs" would be; I would definitely bring this to the sellers attention.
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Old 01-21-2012, 04:16 PM   #15
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I don't know where the "splitting hairs" would be; I would definitely bring this to the sellers attention.
What do you mean when you say "I don't know where the splitting of hairs would be"?

Also - this is my home - I am the buyer of this house.

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