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TOPIC: Roofing over existing roof

Flat Roof change to angled Roof

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I am trying to get rid of a flat section of my house. It has been leaking since we have lived there for 9 years now. I have removed all the old and replaced with new roofing and it still leaks. I want to add an angle and put corrugated metal like the rest of the house. It is only about tweny feet wide. What is your suggeston?
Paul Pendley

7/24/2008
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Apparently some things take longer to get answers for on here than others. I'm in the same situation as you with the house that I'm currently in. I have been doing a lot of research and have found company's that sell metal roofing that can be put on a pitch as low as 1/4:12. You might also look into a standing seam roof. I'm in the process of get roof from Metalsales.us.com. The offer whats called a PBR panel which can be put on low slope roofs. You would also have to get a transition plate, or pitch break to allow you to change pitches without having water leak in. You will also need to get some inside and outside closurers to prevent water from running up under the panels.
Guest User

7/30/2008
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Generally, anything less than a 2:12 pitch will require a mechanically seamed standing seam. These are pans that are placed on the roof and then a seamer is run down them to crimp the seam tightly closed. I suppose there are some corrugated products out there being used on very low pitches but they will require butyl tape between the panel overlaps. Todd Miller
Todd Miller
Isaiah Industries, Inc.

7/30/2008
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I am considering placing a metal roofing system over a conventional flat roofing structure which has failed after 7 years. The client wants to have the roof repaired and to last for at least 20 years. The building is a 100 year church, 90% of the roof has been replaced by metal roofing approximately 5 years ago. The area that needs to be replaced is approximately 30 feet by 30 feet. The metal roof will have a slope of 2 feet over the 30 foot span. I would like to know what additional weight will be added to the roof and block wall structure by using your metal roofing system? If the existing flat roof system is removed and the new roof placed on top of pressure treated 2x 12 spanning the 30 feet and supported every 5 feet with two layers of 5/8” pressure treated plywood and building felt , what would the potential weight saving be for your roof?
Guest User

5/12/2009
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I am considering placing a metal roofing system over a conventional flat roofing structure which has failed after 7 years. The client wants to have the roof repaired and to last for at least 20 years. The building is a 100 year church, 90% of the roof has been replaced by metal roofing approximately 5 years ago. The area that needs to be replaced is approximately 30 feet by 30 feet. The metal roof will have a slope of 2 feet over the 30 foot span. I would like to know what additional weight will be added to the roof and block wall structure by using your metal roofing system? If the existing flat roof system is removed and the new roof placed on top of pressure treated 2x 12 spanning the 30 feet and supported every 5 feet with two layers of 5/8” pressure treated plywood and building felt , what would the potential weight saving be for your roof?
james Stewart

5/12/2009
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