Metal Roof Galvalume Vs Painted

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.

Metal roof galvalume vs painted.

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. The rust on galvanized will just continue to spread and get worse because it doesn t have that self healing property. Paint finish warranties are key to understanding the expected longevity of a galvanized or galvalume metal roof. The problem with galvanized metal painted or not is that once it starts to red rust it doesn t eventually stop as galvalume does.

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. Underneath a painted metal roof there is a galvalume coating. Bare galvalume and painted galvalume sheets suffer rapid corrosion when in contact with mortar and concrete. With that being said the painted metal roof has a 40 year warranty on the paint and 30 year fade warranty.

Also see a complete list of types properties of metal used in roof systems for more about galvalume. Radiant barriers air spaces and added insullation all helps but nothing improves performance like keeping the heat out of the structure to begin with. If you must go with steel make sure its galvalume or at the very least galvanized steel in case of steel shingles. The standard is a 55 a z coating underneath the painted metal is a 50 a z coating.

At galvalume metal roofing. Well first lets address a common misconception. Paint adheres better to galvanized steel than to galvalume so it requires repainting less often. Aluminum roofing comes with paint finishes as well and have their own warranties.

Stainless steel roofing system properties. Painting a bare metal roof with white house paint dramatically improves preformance. They have medium relfectivity and poor emissivity 15. Final thoughts on galvalume vs.

That coating isn t as dense. 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. 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.

That s the normal length of warranty on kynar 500 paint finish.