Make sure roof is square
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By: barry ginter
Title: metal roof installation over existing shingles
Sourced From: www.youtube.com/watch?v=fJNLTfoWJ8A
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Did you miss our previous article...
https://besthawaiiroofer.com/metal-roofing/what-roof-is-best-for-your-home-architectural-shingles-vs-metal-roofing