Can Metal Roofs Be Installed Direct Over Old Shingles?
Q: Is it OK for metal roofing to be screwed down directly on top of asphalt shingles, without any wood or other material between the metal and shingle?
A. You may wish to take a look at the videos in our Metal Roofing 101 video series … there may be some topics of interest to you. I am also attaching a copy of my ebook on How To Buy A Metal Roof.
Very few metal roofs must be installed with battens. However, I always suggest a layer of underlayment over existing shingles. It is an extra safeguard against water and it also protects the back side of the metal from abrasions against the shingle granules. Additionally, I interpret the International Building Code as requiring this underlayment. Not all people interpret the code that way though.
Todd Miller has spent his entire career in the metal building products manufacturing industry. He is president of Isaiah Industries, an organization recognized as one of the world’s leading metal roofing manufacturers. Todd is currently Vice President of the MRA (Metal Roofing Association) and a Past Chair of MCA (Metal Construction Association). Through his website, he strives to raise the bar on standards and practices to provide property owners with the best possible products for successful roofing projects.
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