Comments on: Metal Roofing Pros and Cons http://www.lametalroof.com Discover Pros & Cons of Metal Roofing Thu, 05 Jan 2012 04:25:16 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: admin http://www.lametalroof.com/metal-roofing-pros-and-cons.php/comment-page-1#comment-1651 admin Tue, 24 May 2011 18:10:02 +0000 http://www.lametalroof.com/?page_id=27#comment-1651 Hi Chris, Here is a couple things you should consider first. I always recommend removing ALL shingles before installing a standing seam or any type of vertical panels metal roofing (i.e. corrugated steel roofs) because the shingles will telegraph or punch through the metal panels and you will see ugly horizontal lines. Also most local building codes do not allow more than 2 layers of roofing materials on the roof, unless approved by a structural engineer. So installing a metal roof as a third layer is not "legal", though will not really affect the roof at all, because when you consider the snow load on a shingle roof, it's much more weight than a metal roof, and snow will just fly off of metal roof in the winter (unless there is a snow retention system in place). But back to point one - you really should not install a vertical panels metal roof over shingles. That out of the way, even the thickest gauge steel metal roof weights much less than any asphalt shingle roof, so no reinforcement is required at all. Good luck. PS - I just noticed you are from Texas, so snow is never an issue for you :) Hi Chris,

Here is a couple things you should consider first.

I always recommend removing ALL shingles before installing a standing seam or any type of vertical panels metal roofing (i.e. corrugated steel roofs) because the shingles will telegraph or punch through the metal panels and you will see ugly horizontal lines.

Also most local building codes do not allow more than 2 layers of roofing materials on the roof, unless approved by a structural engineer. So installing a metal roof as a third layer is not “legal”, though will not really affect the roof at all, because when you consider the snow load on a shingle roof, it’s much more weight than a metal roof, and snow will just fly off of metal roof in the winter (unless there is a snow retention system in place). But back to point one – you really should not install a vertical panels metal roof over shingles.

That out of the way, even the thickest gauge steel metal roof weights much less than any asphalt shingle roof, so no reinforcement is required at all.

Good luck.

PS – I just noticed you are from Texas, so snow is never an issue for you :)

]]> By: Chris http://www.lametalroof.com/metal-roofing-pros-and-cons.php/comment-page-1#comment-1496 Chris Fri, 08 Apr 2011 18:49:25 +0000 http://www.lametalroof.com/?page_id=27#comment-1496 Is the weight difference between standing seam metal vs. existing composite asphalt shingles on a residence, enough to warrant reinforcment of typical residential roof framing? Or should an existing roof be able to support the load of the metal? Thank you. Is the weight difference between standing seam metal vs. existing composite asphalt shingles on a residence, enough to warrant reinforcment of typical residential roof framing? Or should an existing roof be able to support the load of the metal?

Thank you.

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