Galvanized Vs Painted Metal Roof

Final thoughts on galvalume vs.

Galvanized vs painted metal roof.

The standard is a 55 a z coating underneath the painted metal is a 50 a z coating. Most galvalume like galvanized steel is coated. Galvalume metal roofing system properties. With that being said the painted metal roof has a 40 year warranty on the paint and 30 year fade warranty.

That coating isn t as dense. The cost of galvalume and galvalume plus are about the same as that of galvanized steel. Details about galvanized metal roofing are at galvanized steel roofs. Aluminum roofing comes with paint finishes as well and have their own warranties.

But galvalume has an excellent performance life in bare exposures as well. 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. The coating corrodes instead of the core material. Apply the sherwin williams paint and primer to a galvanized roof with a paintbrush or a roller specifically designed for corrugated metal.

The metal roofing alliance recommends g 90 galvanized steel for roofing which has 90 ounces of zinc per square foot. If crawling around on a metal roof in the hot sun does. The rust on galvanized will just continue to spread and get worse because it doesn t have that self healing property. Whether it is paint or galvanised steel any coating is designed to protect the base material.

Underneath a painted metal roof there is a galvalume coating. Technically yes however hot dipped galvanized steel resists corrosion in numerous environments for much longer than uncoated steel. Also see complete list of types properties of metals used in roof systemsfor more about galvanized steel roofing. As far as the warranty goes metal roofs hold up great and.

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. 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.

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.