Galvalume Vs Painted Metal Roof

Aluminum roofing comes with paint finishes as well and have their own warranties.

Galvalume vs painted metal roof.

They have medium relfectivity and poor emissivity 15. Quick facts about galvalume. Stainless steel is generally a rust resistant material but it s corrosion resistance to salt depends on the stainless steel alloy or grade. Details about galvalume are.

Galvalume s formula was designed to combine the toughness and strength of zinc with the rust resistance of aluminum. 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. Galvanized and galvalume metal roofs are hot roofs. Bare galvalume and painted galvalume sheets suffer rapid corrosion when in contact with mortar and concrete.

If you must go with steel make sure its galvalume or at the very least galvanized steel in case of steel shingles. Paint adheres better to galvanized steel than to galvalume so it requires repainting less often. Painting a bare metal roof with white house paint dramatically improves preformance. The standard is a 55 a z coating underneath the painted metal is a 50 a z coating.

Paint finish warranties are key to understanding the expected longevity of a galvanized or galvalume metal roof. Underneath a painted metal roof there is a galvalume coating. 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. 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.

I can say from practical experience that nothing beats a white metal roof reflectivity 80 90 and high emissivity 80 90. Neither galvalume or galvanized substrate is warranted to be used in or around animal confinement or agriculture. Bare galvanized and painted galvanized perform better in this type of environment. At galvalume metal roofing.

There is not a substrate or paint warranty on galvalume products within 1 500 feet of saltwater corrosion resistance when compared to galvanized metal galvalume s corrosion resistance is about two to four times better. With that being said the painted metal roof has a 40 year warranty on the paint and 30 year fade warranty. Stainless steel roofing system properties. 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.

That coating isn t as dense.