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TOPIC: Roofing over existing roof

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From reading I think I understand the following: 1. To put over an existing shingled roof, you have to elevate the metal roof and provide airspace between the metan and shingle roof? Either that or heavy felt back the shingle roof BUT you may lose some of the energy conservation benefits of the metal roof if attacked directly to the felt covered shingle roof. 2. Widths and seam typles are a function of different applications and mfg's. From a "looks" perspective if I have a house and 4 barn/outbuildings prolly going with the same roof type might be a smart idea? 3. As I live in Western MA, it prolly would be a good idea to mount the ice breakers on the roof? 4. I can mount this roof material on just about any type of building I choose. For example my house is stick built, my barns are post and beam.
Guest User

9/6/2002
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Craig, First, thanks for thinking metal! 1) An airspace does enhance energy efficiency but testing does show efficiency even when the products are installed "tight" against the roof deck or existing shingle. Many metal roofing products, both vertical seam and "shingle style" can be installed over old shingles, due to their design and low weight. This would need to be confirmed with the individual panel manufacturers. For products that rest right on the roof, though, I suggest using a non-asphaltic "slip sheet" between the old shingles and the metal. This could be either a poly-based underlayment or a layer of "red rosin paper" on top of an asphaltic underlayment like 30-pound felt. 2)I would try to either match all of the roofs or maybe do the house with a different look from the outbuildings. 3) Snowguards will help break up snow and ice as it falls from the roof to protect shrubbery, etc. from damage. 4)Virtually all products can be installed over solid decking. If your barns do not have solid decking, then certain roof products can be installed over purlins / battens and do not require solid decking. Todd Miller
Todd Miller
Isaiah Industries, Inc.

9/6/2002
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can you comment on this line of metal...29 gauge....30 yr warranty
Guest User

9/7/2002
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With metal roofing, you have a great number of products to choose from. That variety is neat because it allows you, as the consumer, to determine what attributes you want in your next roof. With metal roofing, you need to consider: 1) Metal Type; 2)Metal Grade (such as G60, G90, AZ50, AZ55, etc.); 3) Panel profile and aesthetics; 4) Manufacturer test and performance data; 5) Color variety; 6) Coating type; 7) Warranty length; 8) Warranty coverage; 9) Accessory design; 10) Installation; and other things. Any MRA member manufacturer, if contacted directly, will gladly help you weigh these attributes of their products against competing products. Todd Miller
Todd Miller
Isaiah Industries, Inc.

9/8/2002
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