Guest User
5/5/2012
Can I install metal roofing directly over 2 layers of asphalt shingles or must they be removed?
Todd Miller
Isaiah Industries, Inc.
5/5/2012
This is done on occasion provided there are no existing decking weaknesses, no current weight problems, and local building code allows for it. Unevenness in the existing can be telegraphed through to the metal roof though. But overall the low wieght of metal roofing does support applications like this.
Guest User
5/7/2012
Thank you.
Eric Novotny
An informed customer is the Best Customer!
5/8/2012
+1 You will need to ultimately defer to the building code in your area. Anytime you are doing a metal roof (i.e. a permanent option) I always lean towards complete removal and inspection of the decking for properness. There are secondary benefits as it applies to reductions in summer heat gain as well.
Guest User
6/24/2012
So, are you saying there would be better energy efficiency if the asphalt roofing is removed? We have only 1 layer, the original layer. Is the inspection done by the contractor or building code officer? Finally, is this type of metal roofing that much different than the "old" steel roofing? Does the contractor have to be certified to put this metal roofing on? thanks for your time.
Eric Novotny
An informed customer is the Best Customer!
6/25/2012
In most applications, removal of the existing asphalt layer will improve the energy efficiency of the home. I would have to know more about the home, insulation levels, HVAC placements and construction to give you a firm idea of that. Regardless, removal of the old asphalt will give you a more secure and fundamentally sound installation at the end of the day. Inspections for what? If it is the inspection for building code, that is typically handled by the county or state. If you are worried about inspection for correctness, that would be handled by the metal manufacturer or the contractor in most cases. Most metals are slightly different than the old metal roofs but fundamentally the same. There are some manufacturers that certify installers but that does not mean they are the best. Best metal workers I have ever met were not certified in the least but were real pros.

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