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: Insulation Concerns

Ventilation under Metal for Cathedral Ceiling?

Return to Insulation Concerns

Return to Archive

Return to Forum

This topic has been closed by the administrator. Comments are no longer accepted.
I am having a bit of trouble finding the “final word” on the need for ventilation of a metal roof over a cathedral type ceiling. Do I need to provide continuous ventilation from the soffit to the ridge -- between the insulation and the sheathing -- the same as one should do with an asphalt shingle roof? -- Thanks.
jason Levasseur

2/12/2011
Share
Or copy this URL: https://www.metalroofing.com/spirit/comment/15582/find/
Why type of penetrations are in the Cathedral ceiling, if any? Is there any ventilation now? Did the roof ever sweat before? What is the existing construction, insulation type, and depth? Ventilation has nothing to do with shingle (roof material) cooling. It sole purpose to to prevent condensation as a result of the migration of warm moist air from the living space below. If you are insulation with something like spray foam or have a tight envelope (air barrier) the necessity for ventilation is nil. Eric Novotny
Eric Novotny
An informed customer is the Best Customer!

2/13/2011
Share
Or copy this URL: https://www.metalroofing.com/spirit/comment/15583/find/
The international building code does call for ventilation in these circumstances. Older homes which maybe got by without ventilation did so because other parts of the house were not airtight. However, over time, we ten to make houses tighter and we also introduce more moisture sources into them. That creates a recipe for condensation when homes are not vented. As you stated, metal roofed homes need ventilation same as do homes with other types of roofs. Todd Miller
Todd Miller
Isaiah Industries, Inc.

2/13/2011
Share
Or copy this URL: https://www.metalroofing.com/spirit/comment/15584/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