Help with a metal roof?
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Since we know that hurricanes can hit N.C., I would use 29 gauge, plus the plywood under the wood "beams". The plywood can be painted and easily taken down to insulate the roof if you ever decide to screen or glass in the patio. Check building codes in your city and county. We are required to overlap sheets of metal roofing a certain number of grooves or inches, and no water should be able to penetrate overlapping sheets. The junction of the roof and your house is very important. It should ideally have the house roof overlapping the metal roof, and the actual seam between house and metal roof sealed with the spray foam that gets very hard and keeps out leaks. Best wish 😇
As long as you stay off of it, 29 ga. is all you need. I always put my rafters on 16" centers and at least 2x6s. 1 x 4s placed no more than 24" apart should be more than enough support, but it you do choose to use plywood or non directional fiberboard, be sure to cover it with 80# roofing paper before installing the metal roofing. Check you local codes before spending a lot of money. Hope this helps!
Hi Joanne :) First and foremost make sure you have the legal paperwork taken care of that your city or county requires BEFORE you get started with this. You sure don't want to get started and then have to tear it all out because you didn't have the proper licenses to do the work. Check with your local building codes about the underlayment required by the laws of your area before laying your roofing. Some may require wood strips be laid down PLUS plywood nailed onto them; other states requite just the wood stripping, and others only the plywood. There are places, I've HEARD that will allow overlayment of roofing on top of existing roofs. CHECK TO BE SURE WHAT IS REQUIRED WHERE YOU LIVE!
Below are some links to help you with putting a metal roof on your home correctly, and which mistakes to avoid:
https://www.youtube.com/watch?v=RFhzBUJw6w0
https://hailandwind.com/5-things-you-dont-know-about-metal-roofing-or-tin-rufs-to-some-of-us/
http://www.metalroofnet.com/metal-roofing-blog/bid/185425/Determining-the-Best-Gauge-the-Best-Price-for-Metal-Roofing
CORRECT WAY TO INSTALL METAL ROOFING (watch ALL videos before starting, so you will be familiar with what needs to be done when and why):
parts 2-6 of roofing series by Edco roofing panels:
https://www.youtube.com/watch?v=kSDy99fnTRE
https://www.youtube.com/watch?v=70T8538tocM
https://www.youtube.com/watch?v=qa-VdRPm1qw
https://www.youtube.com/watch?v=ocqilAWXRGw
https://www.youtube.com/watch?v=HcXTa8I7yt8
AND ONE LAST VIDEO ABOUT HOW TO ROOF AROUND A VENT PIPE:
https://www.youtube.com/watch?v=-dLRe3kGq1w
OKAY ... THAT'S ALL i CAN DO FOR YOU... GOOD LUCK JOANNE !
Thank you for using HOMETALK as a reference for help in applying a metal roof to your home :)
Your best bet is to check with professionals as their recommendation. You at least want to use what is recommended in case you would ever have to file an insurance claim and insurance could use it against you.