Terrence Conley
2/19/2015
Hello, I am interested in replacing my existing asphalt shingle roof with standing seam. Its a simple 3/12 hip roof with an attached shed roof in the back that is about 1/12. So the rear roof transitions from 3/12 to 1/12. I've just started to contact installers and one in particular mentioned 2/12 being the minimum allowed...I've read that there are standing seam systems that work with lower slope roofs so I guess I would like some guidance as to what viable systems to discuss with the installer. Thanks!
Dick Bus
2/19/2015
Terrence, for the 1/12 pitch you should use a 2" or higher, field seamed panel with in-seam sealant. The 3/12 pitch is better using a snap lock standing seam. In the Florida market I would recommend you use .032 or .040 aluminum with stainless steel clips. The paint finish should be a high performance PVDF coating. Another important aspect is that you verify that the contractor is reputable and does great work. thanks for your interest in using metal roofing.
Terrence Conley
2/19/2015
Thanks for the helpful advice! How would you address the transition from the 2" field seamed panel on the 1/12 pitch to the snap lock on the 3/12 pitch? I assume this will be a critical location for waterproofing. Thanks.
Dick Bus
2/19/2015
yes, this is a critical location. then again all flashing details are critical. The most important thing is that all parts fit properly. The panel manufacturer should have standard details that the contractor would follow. Ask the contractor for a copy of the details in writing.
Guest User
6/20/2016
I too have a 1/12 carport attached to a 3.5/12 hip roof. We are thinking Nu Ray Metals NRM-2000 (Mechanically-seamed panel ideal for low slope roofs; 1½? rib height). Is the 1.5" rib height ok? The carport has a torch down over car decking. If we remove the torch down, can we put the metal over the car decking or should we cover the decking with 1/2" or 5/8" plywood? BTW - we are in a marine environment.
Todd Miller
Isaiah Industries, Inc.
6/20/2016
Thanks, BeachBumm. Your questions really need to be answered by Nu Ray Metals. You want to make sure that what is done is in keeping with their specifications, testing, experience, and warranty on their product. I unfortunately do not have that information, nor can I make any commitment for them. I am really sorry but I just don't see how I can help with your questions.
Guest User
6/20/2016
Nu-Ray is fine with their 1.5" profile, I just wanted to hear what other pro's think about that, but my bigger question, at the moment is that the carport has a torch down over car decking. If we remove the torch down, can we put the metal over the car decking or should we cover the decking with 1/2" or 5/8" plywood first? With such a low pitch, even though the roof will be mechanically seamed, would it be best to cover the decking or plywood with Ice & Water Shield before laying the metal?
Eric Novotny
An informed customer is the Best Customer!
6/20/2016
Mechanical standing seam is fine on ultra low pitches. If you are concerned, covering the deck with high temp Ice/Water would not be a bad thing. I would still cover the Ice/Water with some underlayment as I think it allows things to still move around a bit easier when it comes to the metal moving with temperature.

If you would like to reply to this thread, please log in. If you do not have an Ask the Experts forum user account, create one here.

Find a Contractor

Get Started Today

Take the first step to increasing the value of your home with a great looking, durable, fire resistant and energy efficient metal roof. Browse our list of qualified MRA Member Roofing Contractors in your area for a free consultation and estimate.