[RE-wrenches] Mounting to metal roofs and thermal expansion

[Matt Tritt]

You don't screw the roofing pans down through the pan, they are all held 
down with some kind of clip system; there are no roof penetrations, as 
the hold down screws are under the roofing.

Matt T

Troy Harvey wrote:

> I'm not talking about seam clamps (i.e. S5!), but rather the problem  
> of screwing or bolting through the roof causing problems with thermal  
> expansion. Arguably, clamping to the seams would cause less thermal  
> expansion problems, since screwing through a panel in the middle of  
> the roof could cause buckling at the seams, and thus leak?
>
>
> Troy Harvey
> ---------------------
> Heliocentric
> 801-453-9434
> taharvey at heliocentric.org
>
>
> On Feb 6, 2009, at 11:22 AM, Matt Tritt wrote:
>
>>
>> It is my current understanding that some manufacturers of metal  
>> roofing will not warranty their products if clamps are used on the  
>> standing seams. The reason given is that clamping the seams prevents  
>> the normal movement of the roofing during expansion and contraction.  
>> I can't say which company it is, but it's a big one.
>
>
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