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: Installation Process

2:12 pitch and open-beam construction - what are potential problems?

Return to Installation Process

Return to Archive

Return to Forum

This topic has been closed by the administrator. Comments are no longer accepted.
We want to replace our existing tar + gravel roof with a metal roof. We will be tearing off the t+g. In our area we get heavy rain in winter, every now and then some pea-sized hail, and no snow. In reading the posts in the roof pitch category, it sounds like we can use only a vertical panel, standing seam style metal roof on this shallow 2:12 pitch. Is this correct? Can you recommend some roofing systems that we should evaluate for this installation? Since the house is open-beam construction and has no attic, would a metal roof be prone to a high level of noise during rain/hail? If so, what precautions can we take to dampen the noise? We will be installing 3" rigid-foam insulation on the roof between the tongue & groove ceiling decking and the roofing material. Do we need to put OSB or plywood sheathing over the foam insulation? Do we need to use some sort of underlayment or felting? Do we need to provide an air space between the metal roofing material and whatever is underneath it? How do we compensate for the expansion and contraction of the metal? The roof has existing skylights. Do manufacturers offer flashing kits for skylights and similar penetrations? Are there any particular problems associated with metal roofs and skylights, especially on a shallow slope, that we should be aware of?
Guest User

2/21/2006
Share
Or copy this URL: https://www.metalroofing.com/spirit/comment/7631/find/
The building code generally splits steep steep slope to low slope at a 2/12 pitch. For residential construction I always recommend ventilation as required for steep slope which is a 1" minimum vented air space between the insulation and roof covering. Certainly most vertical rib panels are better suited for the lower slope application. Do choose a panel and then ask to see tyhe ICC-ES product evaluation report which will indicate it has been tested and approved for your application. Once you have the system selected make sure they have the flashing kits for the skylights. usual;ly the skylights need to be mounted on curbs higher than 6".
Allan Reid
Dura-Loc Roofing Systems, Inc.

2/21/2006
Share
Or copy this URL: https://www.metalroofing.com/spirit/comment/7632/find/
  • About the MRA
    • Member Companies
    • Leadership
    • MRA News
  • For Professionals
    • Join the MRA
    • Industry Resources
    • Upcoming Events
  • Contact
  • Subscribe
©2018 Metal Roofing Alliance. All Rights Reserved. Privacy Policy Terms and Conditions