Join the MRA | Member Login
Find a Professional
  • Why Metal Roofing?
    • Benefits of Metal Roofing
    • Compare Roofing Materials
    • Homeowner Testimonials
    • Inspiring Metal Roofing Projects
  • Homeowner Resources
    • MRA Roofing Buyer’s Guide
    • Resilient Housing Guide
    • Metal Roof Sustainability Guide
    • Metal Roofing News
    • Member Resources and News
    • Industry Partners
    • Frequently Asked Questions
    • Preparing for Hurricane Season
    • Regional Considerations
  • 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: Installation Process

Ribbed Metal Roof Installation

Return to Installation Process

Return to Archive

Return to Forum

This topic has been closed by the administrator. Comments are no longer accepted.
I am looking at a country home in the Dallas TX area and it has a metal roof. The home roof is so steep that it is almost a modified A-frame construction. I noticed in the attic that there is no ventilation other than what gaps are there from ridge cap placed over the metal roof . The builder also installed the metal roof without any sheathing and then place R-19 insulation beteween the rafters and ceiling joists. Is this A proper way to install ribbed metal roofing. Is ventillation essential. Doesn't there need to be a vaport barrier between the insullation and the roof. The reason I ask is the builder was a DIY.
Xu Nomemo

8/12/2004
Share
Or copy this URL: https://www.metalroofing.com/spirit/comment/3719/find/
A vapor barrier should be located behind the ceilings in order to prevent moisture from entering the attic to begin with. Is there insulation up between the roof rafters, behind the roofing panels? If so, then a vapor barrier could also be located beneath that insulation. I am unclear form your posting as to whether there is a vented ridge cap or not. I am a strong believer in good attic ventilation, normally consisting of soffit vents as intake and a ridge vent as exhaust. The goal here is to keep warm moist air from collecting in the attic and then condensing against the back side of the roofing panels when they cool down according to outside temperatures. As far as your roof panels having been installed over purlins instead of decking, there are many roof panels which can be installed that way. You'd have to check with tha manufacturer of yours in order to determine whether it was an appropriate procedure for your roof.
Guest User

8/13/2004
Share
Or copy this URL: https://www.metalroofing.com/spirit/comment/3720/find/
  • About the MRA
    • Member Companies
    • Leadership
    • MRA News
  • For Professionals
    • Join the MRA
    • Industry Resources
  • Contact
  • Subscribe
©2023 Metal Roofing Alliance. All Rights Reserved. Privacy Policy Terms and Conditions