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.

At galvalume metal roofing. Details about galvalume are. They have medium relfectivity and poor emissivity 15. Aluminum roofing comes with paint finishes as well and have their own warranties.

Galvanized and galvalume metal roofs are hot roofs. I can say from practical experience that nothing beats a white metal roof reflectivity 80 90 and high emissivity 80 90. Bare galvanized and painted galvanized perform better in this type of environment. 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.

Stainless steel is generally a rust resistant material but it s corrosion resistance to salt depends on the stainless steel alloy or grade. Quick facts about galvalume. That s the normal length of warranty on kynar 500 paint finish. With that being said the painted metal roof has a 40 year warranty on the paint and 30 year fade warranty.

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 adheres better to galvanized steel than to galvalume so it requires repainting less often. Paint finish warranties are key to understanding the expected longevity of a galvanized or galvalume metal roof. Painting a bare metal roof with white house paint dramatically improves preformance.

Well first lets address a common misconception. Also see a complete list of types properties of metal used in roof systems for more about galvalume. Bare galvalume and painted galvalume sheets suffer rapid corrosion when in contact with mortar and concrete. Galvalume s formula was designed to combine the toughness and strength of zinc with the rust resistance of aluminum.

Stainless steel roofing system properties. Underneath a painted metal roof there is a galvalume coating. That coating isn t as dense. 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 standard is a 55 a z coating underneath the painted metal is a 50 a z coating.