Underlayment for Metal Roof

Guest User
4/26/2007
I have an Asphalt shingle roof with 1 layer of shingles on a 4/12 pitch. The shingles on the north side are in good shape, and the shingles on the south side are just beginning to curl. The roof has never leaked. I would like to put on a metal roof(overlapping panels installed vertically). Can I install the metal panels over the shingles if I cover the shingles first with felt paper. How much should I let the panels overhang the roof at the bottom? And should I use the rubberized paper product on the bottom edge to prevent Ice buildup?
Todd Miller
Isaiah Industries, Inc.
4/26/2007
Most metal roofs could be installed over this, with an appropriate underlayment as specified by the metal roofing manufacturer. Ice and watershield over the eaves is a good idea and may be required by code where you're at. It odes not prevent ice buildup but can prevent water intrusion. As far as the overhang of the panels -- totally dependent on the product you install -- is specified by the manufacturer.
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