How To Install Metal Roof Over Shingles

This is what it looks like when you install a steel shingle roof system over an existing asphalt shingle roof.

How to install metal roof over shingles.

We get asked this question all the time. A steel roof is a lifetime investment lasting 50 years or more if it s a good one. Cool outside air travels under the shingles to the vented ridge pulling out moisture and heat. Install with 1 4 inch metal wood screws at a distance of every two feet.

Anatomy of a steel roof. Codes vary so call your local building department to know how to install metal roofing over shingles properly code wise. Use notching scissors to notch the metal in the middle so that it will bend over the ridge. Metal roofing is also available in the form of shingles.

Then cover the entire roof with a layer of insulation and secure it with a staple gun. Yes you can and by doing so you save in the labor and hassle of tearing off the old roof and you won t be contributing to filling our landfills. It doesn t matter if the air space is a half inch or six inches because the condensation factor will remain the same. What s involved in how to install metal roofing.

Lay the starter row of metal shingles at the drip edge and affix to the roof with metal roofing nails. 3 install 1 4 purlins down over the shingles before installing the metal roof the third way to install a metal roof over shingles is by applying 1 4 purlins over the shingle roof. Before you install metal roofing repair any damage to the wood under the shingles. Make sure roof is square.

Put the steel down directly on a vapor barrier. Next use 1 inch nails to secure some metal edging to the perimeter of the roof. Your metal trim will go along the roof s edges as well as the top ridge. As long as the plywood under the shingle roof is in good condition this way can provide many benefits.

Metal roof over shingles condensation metal roofs must be laid flat on a vapor barrier because steel will condensate if there s any air space underneath it. This is by far the most common way to install a metal roof.