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
    • 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: Condensation Issues

condensation

Return to Condensation Issues

Return to Archive

Return to Forum

This topic has been closed by the administrator. Comments are no longer accepted.
Our ribbed metal roof is only a little over a year old. It was new construction. We have overhang vents as required, ridge vent (although it appears to be pulled down to tight) and all the roof is over the same floor space. There is no underlayment under the metal roof. Metal roof is directly laying on the rafters. The puzzling part is we have no condensation problems over one side of the attic and a lot of condensation on the other half. It looks like there is an invisible barrier between the two descending sides of the roof when you go in the attic with one side wet and one side dry. Same insulation, same vapor barrier over all of roof. Any ideas? Two differents contractors have no idea why the difference. Only difference I see is the dry side faces the sunny side and the wet side gets no sun during the day but both are cold at night when the condensation occurs. Help!!
Guest User

1/3/2005
Share
Or copy this URL: https://www.metalroofing.com/spirit/comment/4939/find/
There could be a number of factors. Condensation happens when the inside air temperature drops across the current dew point. There could be enough residual heat in the metal roof that the temperature on the inside surface does not drop below the dew point. Also it could be on the side of the house that has the kitcen, bath, laundry etc that creates more moisture and heat which combined could be leaking into the attic on one side. Most probably you have reasonable ventilation that given a certian wind direction is moving the air up under the roof metal on one side taking the condensation out with it. Also need to look at the condition of the intake air. One side is shaded and cooler and the other would have warm siding to pull intake air from. The problem you have is that you did not provide a moisture barrier under the roof covering to isolate the attic air, which in itself limits the amount of condensation and then trap any condensation that does form and provide it with an exit at the eaves. I would suggest that you get this issue addressed, Contact the roofing manufacturer and get their recomendation.
Allan Reid
Dura-Loc Roofing Systems, Inc.

1/4/2005
Share
Or copy this URL: https://www.metalroofing.com/spirit/comment/4940/find/
  • 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