Guest User
3/22/2003
I am going to be installing a standing seam roof over my old asphalt shingle roof. Everything I see says to put down #30 felt paper. Does it go under or on top of purlins??
Todd Miller
Classic Products, Inc.
3/23/2003
I detect from your question that there might be some confusion concerning the proper installation of these products. Most vertical seam roofs being used residentially are designed to be installed over decking, not purlins. When installed over purlins, it is unusual to use underlayment. I strongly suggest checking with the manufacturer of the product you've chosen for their full installation details.
Guest User
4/3/2003
Is it O.K. to put metal roofing over the current one layer shingles. Shingles are in good condition.
Todd Miller
Classic Products, Inc.
4/4/2003
A good underlayment should be used between the old shingles and the new metal. The typically suggested underlayment is 30-pound felt, perhaps followed by a "slip sheet" of red resin paper with metal roof profiles which have a lot of contact with the underlayment. There are also several polymer-based underlayments now becoming very popular. As far as whether you can put the metal over the old shingles, there are several factors. First is whether the structure can handle the weight. Metal roofing is much lighter than other materials so the answer to this is usually "yes". However, if there is an existing weight problem on the roof, that needs to be addressed. Also, any areas where leaks might have occurred and the decking might be rotten need to be addressed. Many metal roof profiles are ideal for going over old shingles, even if they are somewhat curled. Many metal roof profiles can even be installed over wood shakes and shingles. Generally, the more textured metal roof profiles are more forgiving for this. Once you select a product, make sure that its manufacturer is agreeable with going over your old shingles. Be sure to select an MRA member manufacturer as we all agree to meet certain quality standards with out products.
pauline kerns
3/31/2004
What type of metal roof is the most cost effective but still with high refelctive value and wind resistance? I am bilding in gulf shores al but not directly on the water but across the street from the Bay on a golf course.
Allan Reid
Dura-Loc Roofing Systems, Inc.
3/31/2004
Generally speaking in metal roofing you get what you pay for. One could buy a low profile panel with thinner cheaper paint systems however they do not stand up to the wind, sun and salt spray. In your situation, I would recommend an Aluminum or Galvalume substrate as they best resist salt air. Then I would choose a Kynar paint or Granular finish as they best resist the sun and salt. Last, once I choose a product, I would ask to see their product approval report, which shows they went through salt spray testing and wind uplift. As you are on a golf course, choose a product that has a UL Class 4 hail rating so you know it will resist damage from golf balls. As to reflective, choose a product that is Energy Star rated, typpically the lighter colour the better the rating.
Guest User
4/6/2004
can metal roofing be applied over composition roofing ?
Todd Miller
Classic Products, Inc.
4/6/2004
Many types of residential metal roofing can be installed over old shingles. The low weight, formed thickness, and fastening methods of these products are conducive to this. You still need to adhere to local building codes which may have a two roof maximum. Also, any existing areas where the decking is in bad condition must be addressed. If you use this website to find some products you like, link to their manufacturers to inquire about suitability for going over the old shingles.
Guest User
4/7/2004
Trying to find out thickness of sheating under the metal roon, I want to use 1/2" OSB but another bilder told me I have to use 5/8" or thicker. I can find nothing in the code or specs that states 1/2" will not work. We are in Arizona and have no snow load,. We use 1/2" OSB on our 1/2" x 12 flat roof pitch all the time. Need a suggestion - thanks Mike
Guest User
4/7/2004
Trying to find out thickness of sheating under the metal roon, I want to use 1/2" OSB but another bilder told me I have to use 5/8" or thicker. I can find nothing in the code or specs that states 1/2" will not work. We are in Arizona and have no snow load,. We use 1/2" OSB on our 1/2" x 12 flat roof pitch all the time. Need a suggestion - thanks Mike
Todd Miller
Classic Products, Inc.
4/7/2004
This recommendation needs to come from the metal roofing manufacturer, and, at a minimum, needs to meet local codes. Generally, 1/2" will meet codes and will meet the requirements of most metal roofing producers.
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