Galvalume Vs Painted Metal Roof

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.

Galvalume vs painted metal roof.

Neither galvalume or galvanized substrate is warranted to be used in or around animal confinement or agriculture. 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. Paint adheres better to galvanized steel than to galvalume so it requires repainting less often.

If you must go with steel make sure its galvalume or at the very least galvanized steel in case of steel shingles. At galvalume metal roofing. That coating isn t as dense. Bare galvalume and painted galvalume sheets suffer rapid corrosion when in contact with mortar and concrete.

Painting a bare metal roof with white house paint dramatically improves preformance. They have medium relfectivity and poor emissivity 15. The standard is a 55 a z coating underneath the painted metal is a 50 a z coating. Aluminum roofing comes with paint finishes as well and have their own warranties.

Details about galvalume are. That s the normal length of warranty on kynar 500 paint finish. Well first lets address a common misconception. With that being said the painted metal roof has a 40 year warranty on the paint and 30 year fade warranty.

Paint finish warranties are key to understanding the expected longevity of a galvanized or galvalume metal roof. 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. 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. Bare galvanized and painted galvanized perform better in this type of environment.

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. Stainless steel roofing system properties. Quick facts about galvalume. Underneath a painted metal roof there is a galvalume coating.

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