Join the MRA | Member Login
Find a Professional
  • Why Metal Roofing?
    • About MRA
    • Benefits of Metal Roofing
    • Compare Roofing Materials
    • Homeowner Testimonials
    • Inspiring Metal Roofing Projects
  • Homeowner Resources
    • Metal Roofing Buyers Guide
    • Resilient Housing Guide
    • Metal Roof Sustainability Guide
    • Above All Else You Need a New Roof eBook
    • MRA News
    • Member Provided Resources
    • Today’s Homeowner Partnership
    • 3rd Party Articles
    • Frequently Asked Questions
    • Preparing for Hurricane Season
  • Gallery
  • Visualizer
  • Ask The Experts
    • Energy Efficiency
    • Existing Metal Roof Questions
    • Installation
    • Is A Metal Roof Right For My House
    • Metal Roofing Benefits
    • Product Selection
    • Other
    • Archive
  • Find a Professional
Join the MRA Member Login
Sign Up Log In Add New Topic

TOPIC: I Have An Existing Metal Roof and Have A Question

Raining Inside My Sunporch

Return to I Have An Existing Metal Roof and Have A Question

Return to Forum

I enclosed my 12x20 porch . I installed metal roof on 2x4 16" C purlins and purlins screwed to the 24"C rafters . After completing enclosure and adding heat source I quickly saw the terrible condensation inside the metal ! I am asking for any opinions or ideas on the 2 ways I believe the condensation could be solved . #1 Spray at least 3" of closed cell foam up on inside of metal between and probably over the purlins . I was told by a foam company that 3" should resolve the moisure . #2 Use ADO Durovent http://adoproducts.com/as_durovent up inside the rafters and against the purlins . As you can see with #2 the Durovent would run inside the rafters from the house facia upper end down to and into the soffit area . Note there is a 2x6 where the roof originally ended but I added the overhang later . Thus where the Durovents go trhu that rafter I will need to cut out for the baffles to pass into the soffit area . Then at the upper end house facia end I would need to cut out or drill holes in areas between rafters into what would be the house attic . This should allow moisture drainage into soffit area and ventilation . Under the Durovent I would install fiberglass insulation and later probably plaster board .
Brent Mason

1/14/2016
Share
Or copy this URL: https://www.metalroofing.com/spirit/comment/20921/find/
I feel that either method could work though the first one is probably simpler. You also could do both. If you only do the latter, I would suggest also adding a vapor barrier between your fiberglass insulation and the dry wall. The vapor barrier could be a sheet of 6 mil polyethylene. Todd Miller
Todd Miller
Isaiah Industries, Inc.

1/15/2016
Share
Or copy this URL: https://www.metalroofing.com/spirit/comment/20922/find/

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.

  • About the MRA
    • Member Companies
    • Leadership
    • MRA News
  • For Professionals
    • Join the MRA
    • Industry Resources
    • Upcoming Events
  • Contact
  • Subscribe
©2023 Metal Roofing Alliance. All Rights Reserved. Privacy Policy Terms and Conditions