Galvalume Vs Painted Metal Roof

Stainless steel roofing system properties.

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. 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. Also see a complete list of types properties of metal used in roof systems for more about galvalume. 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.

The standard is a 55 a z coating underneath the painted metal is a 50 a z coating. 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. 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. Bare galvanized and painted galvanized perform better in this type of environment. Galvalume s formula was designed to combine the toughness and strength of zinc with the rust resistance of aluminum. Aluminum roofing comes with paint finishes as well and have their own warranties.

Underneath a painted metal roof there is a galvalume coating. Details about galvalume are. With that being said the painted metal roof has a 40 year warranty on the paint and 30 year fade warranty. 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.

Well first lets address a common misconception. Quick facts about galvalume. That s the normal length of warranty on kynar 500 paint finish. Stainless steel is generally a rust resistant material but it s corrosion resistance to salt depends on the stainless steel alloy or grade.

That coating isn t as dense. Painting a bare metal roof with white house paint dramatically improves preformance. 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. At galvalume metal roofing.

They have medium relfectivity and poor emissivity 15.