Galvalume Vs Painted Metal Roof

Galvalume s formula was designed to combine the toughness and strength of zinc with the rust resistance of aluminum.

Galvalume vs painted metal roof. 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. 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. Stainless steel is generally a rust resistant material but it s corrosion resistance to salt depends on the stainless steel alloy or grade.

With that being said the painted metal roof has a 40 year warranty on the paint and 30 year fade warranty. They have medium relfectivity and poor emissivity 15. Neither galvalume or galvanized substrate is warranted to be used in or around animal confinement or agriculture. The standard is a 55 a z coating underneath the painted metal is a 50 a z coating.

Bare galvanized and painted galvanized perform better in this type of environment. If you must go with steel make sure its galvalume or at the very least galvanized steel in case of steel shingles. Aluminum roofing comes with paint finishes as well and have their own warranties. Underneath a painted metal roof there is a galvalume coating.

That coating isn t as dense. Details about galvalume are. Well first lets address a common misconception. 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.

Painting a bare metal roof with white house paint dramatically improves preformance. Stainless steel roofing system properties. At galvalume metal roofing. Also see a complete list of types properties of metal used in roof systems for more about galvalume.

Quick facts about galvalume. 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. 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. That s the normal length of warranty on kynar 500 paint finish.

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.