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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.<br>
<br>
Matt T<br>
<br>
Troy Harvey wrote:
<blockquote
cite="mid34FBA8DE-4764-414A-B901-D0A4C29FCBE3@heliocentric.org"
type="cite">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?
<br>
<br>
<br>
Troy Harvey
<br>
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On Feb 6, 2009, at 11:22 AM, Matt Tritt wrote:
<br>
<br>
<blockquote type="cite"><br>
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.
<br>
</blockquote>
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