Q:

How do you install a metal roof over shingles?

A:

Quick Answer

Install metal roofing over shingles by screwing furring strips to the existing roof and attaching the metal to the strips. Metal roofing is available in standing seam materials or metal shingles. The furring strips allow air circulation to reduce condensation and prevent ice dams.

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Full Answer

Metal roofing offers several advantages to asphalt shingles. It is lighter in weight, and manufacturers design it to last 50 years or more. It adds strength to the existing roof and does not require removal of the existing shingles. Manufacturers use a coating for this material that is less susceptible to fading than older metal roofs.

As of 2015, the cost of metal roofing is more than for asphalt shingles. Asphalt shingles have a price range of $30 to $85 per 100 square feet or square, with installation costing $70 to $250 per square. Painted steel shingles cost $125 to $250 per square and have an installation cost of $150 to $650 per square. Many homeowners are able to install both types of shingles for themselves. Standing seam metal roofing is another option for installation over existing shingles but is more expensive. Materials cost $300 to $550 per square and the recommended professional installation adds $400 to $1,200 per square to the overall cost.

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