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: Roofing over existing roof

Metal roof over shingles with foam insulation

Return to Roofing over existing roof

Return to Archive

Return to Forum

This topic has been closed by the administrator. Comments are no longer accepted.
We finished building our new log home 3 years ago. We have a cathedral ceiling in the great room. We have had a lot of ice dams that build up and have caused some internal leaking. We took care of the leaking but still think A LOT of heat is being lost through the roof. Putting more insulation is not an option without tearing the roof up. The ceiling inside is finished tongue&grouve. I want to know if it is possible to put a metal roof over shingles with an inch or so of foam insulation. Maybe with furing strips?
Guest User

1/24/2009
Share
Or copy this URL: https://www.metalroofing.com/spirit/comment/12643/find/
Rod, It can be done. We usually use ISO board (better R-value than styrofoam). Typically, we use 2" or 3" ISO with 1/2 CDX or waferboard over that. There has been some jobs that we use lathes(furring strips). I would use 2x4's with 1&1/2 inch ISO board. The ISO comes in 4x8 sheets, cut it down the middle lengthwise. This gives you a 2 foot by 8 foot strip. Band the roof (all outside edges) with the 2x4. You then install a 2 foot wide strip of ISO butted against the 2x4 and then a 2x4 butted against your ISO. You do this all the way up the roof. Doing it this way ensures you a minimum loss on you ISO board. [email protected]
Guest User

1/25/2009
Share
Or copy this URL: https://www.metalroofing.com/spirit/comment/12644/find/
Wade, Do you think a 1&1/2 inch will be enough to raise the R-value? Do I glue the ISO down or screw it? I want to DIY the project. So any advice is appreciated. Are the 2 foot wide strips so there is something to screw the metal roofing to? Do I have to worry about venting? I will have the help of a friend that is experienced in carpentry but a specialist is always better. Thanks
Guest User

1/27/2009
Share
Or copy this URL: https://www.metalroofing.com/spirit/comment/12645/find/
Rod, Email me at [email protected] and I will give you my phone number and talk you through it. Wade
Guest User

1/27/2009
Share
Or copy this URL: https://www.metalroofing.com/spirit/comment/12646/find/
Thanks Wade. Todd Miller
Todd Miller
Isaiah Industries, Inc.

1/28/2009
Share
Or copy this URL: https://www.metalroofing.com/spirit/comment/12647/find/
Hi all! I've just visited this forum. Happy to get acquainted with you. Thanks. __________________ [url=http://animewatching.com]Watch Anime Episodes[/url]
Anna Lee
htyhthr

11/10/2009
Share
Or copy this URL: https://www.metalroofing.com/spirit/comment/12648/find/
I'm doing metal roof on my double wide. Can I gule 1/2"form insulation to the shingle then screw it directly thru the foam, shingle and into the plywood. The foam does have a vapor barier. Any Idea?
Guest User

6/19/2010
Share
Or copy this URL: https://www.metalroofing.com/spirit/comment/12649/find/
From an installation standpoint, you are best suited to remove the shingles so that the insulation can lay flat on the deck. Insulation only works if it is in direct (no air spaces) contact with what it is trying to insulate. Given the textured surface of the asphalt and raised profile (if an architectural shingle) the foam will not be doing as good a job as it could be. I would screw the foam down, put a plywood top on it and apply your new roof. Eric Novotny
Eric Novotny
An informed customer is the Best Customer!

6/20/2010
Share
Or copy this URL: https://www.metalroofing.com/spirit/comment/12650/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