metal roof and shingles | Ask The Experts Forum

betty dunkin 9/15/2011	I need to know the pro's and con's of putting a metal roof over exsisting shingles. Also, I have a well insulated and vented attic so do I need to worry about condensation and mold problems ?	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/16604/find/
Todd Miller Isaiah Industries, Inc. 9/15/2011	Metal roofing is much lower weight than most other roofing choices. This encourages installation over existing shingles. Additionally, most metal roofing warranties are not affected if the product is installed over old shingles. Most building codes though stipulate no more than two layers of roofing. We have seen that waived for metal roofs on occasion by building inspectors though. If your existing roof has an weight issues or other structural issues (such as leaks, rot, bad sagging, etc) those should be addressed rather than just install over the top. Keeping the old roof in place helps with home energy efficiency and avoids having to put old roofing shingles in a landfill. If you have good insulation and ventilation including that all plumbing or other exhaust vents are vented to the outside, you should not have any issues with condensation.	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/16605/find/
Eric Novotny An informed customer is the Best Customer! 9/16/2011	+1 You should be just fine. Check for the number of layers of asphalt before proceeding.	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/16606/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.

Find a Contractor

Get Started Today

Take the first step to increasing the value of your home with a great looking, durable, fire resistant and energy efficient metal roof. Browse our list of qualified MRA Member Roofing Contractors in your area for a free consultation and estimate.

Search Now