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

Best Practices for Insulation

Return to Installation

Return to Forum

We are building a hybrid steel home and I have not decided how to insulate the roof and was hoping for some feedback. We are building a 40x60 residence that will be T'd to a 30x60 garage. The residence building will be half attic and half cathedral open ceiling. I have read a lot about Zip System sheathing, tape and flashing and want to use this as the sheathing for both buildings. I am thinking that the section of residence with attic, we will insulate like a standard home with blown in and vent the space with soffit and ridge vents. But I am unsure about the cathedral roof/ceiling section. My purlins will be 2x8's for residence and 2x6's for garage and not steel. I am thinking that I would insulate the 7.5" cavity with either mineral wool or fiberglass. The garage building I am again thinking complete zip sheathing and then blanket insulation.

Please let me know if this makes sense of if there are best practices for insulating a steel roof, steel sided home? Again, our home will be a hybrid steel structure, the girts and purlins will be wood. The only steel will be the trusses themselves. Thanks for the help!

Bruce Bowen

1/13/2022
Share
Or copy this URL: https://www.metalroofing.com/spirit/comment/25783/find/

Thank you. I am not sure where you are located but, especially in the cathedral area, I think having a vapor barrier behind the drywall would help prevent moisture migration into the insulation.

Additionally, check with your metal roof manufacturer to see whether they suggest a layer of mechanically fastened underlayment on top of the ZIP System sheathing. I believe that most manufacturers do.

Todd Miller
Todd Miller
Isaiah Industries, Inc.

1/14/2022
Share
Or copy this URL: https://www.metalroofing.com/spirit/comment/25785/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
  • Contact
  • Subscribe
©2023 Metal Roofing Alliance. All Rights Reserved. Privacy Policy Terms and Conditions