Galvalume Roofing Over Shingles

This coating acts as an excellent protection against corrosion.

Galvalume roofing over shingles.

3 install 1x4 purlins down over the shingles before installing the metal roof the third way to install a metal roof over shingles is by applying 1x4 purlins over the shingle roof. Though you ll get more life out of a metal roof you ll pay the price at the time of installation. The first way is to run new underlayment over the existing shingle roof completely covering the old roof. Metal roofs generally can run from 120 to 900 per 100.

The one exception is when the coating is penetrated scratched or chipped by falling or blowing debris for example. Via abc metal roofing. For example aluminum roof shingles cost about 4 60 per square foot and 10 per square foot installed while galvanized steel roof panels cost 3 35 per square foot and 7 75 per square foot installed. Aluminum has tremendous corrosion resistance so it will generally corrode more slowly than galvanized steel.

Galvalume and galvanized steel roofing are affected differently by corrosion. Doesn t provide the flattest surface for the metal roofing to be installed over each course of shingles is about a 1 8 higher than the course just below it. Corrosion is the death of metal roofing as we all know. Many arizona homeowners with shingle roofs do decide to roof over their existing shingles because.

Many factors will weigh in on the total cost to install your new roof. The first one being that the new underlayment will act as a second line of defense in case water would to somehow get underneath the metal roof. Metal roof installation costs are about the same price or slightly more than your metal panels or shingles. Before you reshingle a roof read our step by step guide for adding new shingles over old ones.

You can save money because there s no dump fee for removing your old roofing and there s no need for additional felt paper over the old roof. Asphalt shingles can be laid over cedar shakes or shingles however this is a roofing project best left to pros. One roofing material that stands above the rest for high quality longevity and durability is galvalume. Let s start with the good.

This superior roofing material also used as siding is actually sheets of steel coated with a composition of 45 zinc and 55 aluminum. There are really two ways to install a metal roof over a shingle roof. Shingle roofs are cheaper up front. As far as your concern of getting old shingles away from the island you may be able to roof over the existing shingles with metal shingles if there are currently no more than one layer of shingles in place.

However if there are currently two or more layers of shingles on your roof it may be a wiser option for you to do a tear off perhaps in section before a new metal roof is installed.