Metal Roof On Top Of Asphalt Shingles

Put the steel down directly on a vapor barrier.

Metal roof on top of asphalt shingles.

Can you avoid tearing off your old asphalt shingle roof by putting a steel roof over it. This is by far the most common way to install a metal roof. Anatomy of a steel roof this is what it looks like when you install a steel shingle roof system over an existing asphalt shingle roof. As long as the plywood under the shingle roof is in good condition this way can provide many benefits.

If you are trying to decide between the two materials it s important to carefully look at the metal over shingle roof problems. It doesn t matter if the air space is a half inch or six inches because the condensation factor will remain the same. Both metal and shingle roofs are great options for your next roofing project. Metal roof over shingles condensation.

The second way to install a metal roof over a shingle roof is with the use of purlins or battens. However metal roofing is surging in popularity as more aesthetic options become available. Now there are metal shingles and panels that imitate materials like slate tile wood shake and even asphalt. Metal roofs are stylish.

Things to know about metal over shingle roof problems. Today s metal roofs are a far cry from the corrugated tin barns of the bucolic past indeed now you can choose from tin zinc aluminum copper or galvanized steel. Asphalt shingle roofing is a dominant material for residences. The purlins are screwed or nailed down to the roof deck depending on how the metal roofing manufacture has testing for their roofing panels and then the metal is installed to the purlins.

A steel roof is a lifetime investment lasting 50 years or more if it s a good one. Most codes now allow no more than two layers of roofing before requiring a complete tear off. Metal roofs generally can run from 120 to 900 per 100 square feet one 10 foot by 10 foot area or a square of material while asphalt shingles will be between 100 and 200 per 100 square. So if your roof has two layers it may require a complete tear off even though steel is lighter than asphalt.

Metal roofs must be laid flat on a vapor barrier because steel will condensate if there s any air space underneath it. Asphalt roofs typically last 20 to 30 years depending on the installation and shingle quality.