[Greenbuilding] exposed fasteners on steel roof

[Vadurro, Rob, EMNRD]

On Wed, 22 Aug 2007 22:28:25 -0400, Bruce Donelson
<abetterbuilder at frontiernet.net> wrote:

 

> 

> steel roof

> EXPOSED FASTENERS ARE GOOD FOR A WOODSHED, NOT A HOUSE

 

Rob Tom:

I'd be interested in hearing the reasoning behind this statement.

I suspect that it is a prejudice that is borne out that peculiar thing
we  

call "taste" more than it is out of actual performance criteria.

 

 

I'll go out on a limb and say that I believe the statement is to
encourage concealed fasteners over exposed fasteners (not asphalt
shingles over metal roofing). Aesthetics aside, exposed fasteners use a
rubber or neoprene gasket at the screw/ roof interface which can (will)
deteriorate and leak in time. They are also somewhat more subject to
temperature swings loosening the hole around the screw fasteners.
Concealed mounting systems can (not always, of course) be designed for
thermal movement and don't rely on rubber seals.

 

-Rob Vadurro

 



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