Galvalume Vs Painted Metal Roof

All things being equal standing seam metal roof will cost more than metal shingles although performance wise they offer pretty much the same benefits and longevity.

Galvalume vs painted metal roof.

Bare galvanized and painted galvanized perform better in this type of environment. Galvanized and galvalume metal roofs are hot roofs. Additionally primer and paint adhere better to galvalume coated panels and they carry a 20 year limited warranty while galvanized panels do not making them a smarter long term investment for your customers homes agricultural buildings or commercial properties. The big difference is that aluminum will oxidize chalk if exposed to the elements but the aluminum will not look unsightly and continue on with a rapid oxidation process deterioration rust as steel will.

Underneath a painted metal roof there is a galvalume coating. Aluminum roofing comes with paint finishes as well and have their own warranties. I can say from practical experience that nothing beats a white metal roof reflectivity 80 90 and high emissivity 80 90. Also see a complete list of types properties of metal used in roof systems for more about galvalume.

Paint finish warranties are key to understanding the expected longevity of a galvanized or galvalume metal roof. Paint adheres better to galvanized steel than to galvalume so it requires repainting less often. The standard is a 55 a z coating underneath the painted metal is a 50 a z coating. Quick facts about galvalume.

At galvalume metal roofing. That coating isn t as dense. If you must go with steel make sure its galvalume or at the very least galvanized steel in case of steel shingles. Painting a bare metal roof with white house paint dramatically improves preformance.

Bare galvalume and painted galvalume sheets suffer rapid corrosion when in contact with mortar and concrete. Stainless steel roofing system properties. Well first lets address a common misconception. Stainless steel is generally a rust resistant material but it s corrosion resistance to salt depends on the stainless steel alloy or grade.

Galvalume s formula was designed to combine the toughness and strength of zinc with the rust resistance of aluminum. They have medium relfectivity and poor emissivity 15. That s the normal length of warranty on kynar 500 paint finish. Details about galvalume are.

With kynar 500 or hylar 5000 paint finish or its equivalent you will not have to paint over your steel roof for at least 30 years.