Galvanized Vs Painted Metal Roof

The standard is a 55 a z coating underneath the painted metal is a 50 a z coating.

Galvanized vs painted metal roof.

Paint finish warranties are key to understanding the expected longevity of a galvanized or galvalume 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. Details about galvanized metal roofing are at galvanized steel roofs. The coating corrodes instead of the core material.

Both types of steel can be painted to improve durability. Aluminum roofing comes with paint finishes as well and have their own warranties. The cost of galvalume and galvalume plus are about the same as that of galvanized steel. The metal roofing alliance recommends g 90 galvanized steel for roofing which has 90 ounces of zinc per square foot.

Final thoughts on galvalume vs. That coating isn t as dense. The problem with galvanized metal painted or not is that once it starts to red rust it doesn t eventually stop as galvalume does. Paint adheres better to galvanized steel than to galvalume so it requires repainting less often.

As far as the warranty goes metal roofs hold up great and. Underneath a painted metal roof there is a galvalume coating. Most galvalume like galvanized steel is coated. With that being said the painted metal roof has a 40 year warranty on the paint and 30 year fade warranty.

But galvalume has an excellent performance life in bare exposures as well. Apply the sherwin williams paint and primer to a galvanized roof with a paintbrush or a roller specifically designed for corrugated metal. The rust on galvanized will just continue to spread and get worse because it doesn t have that self healing property. Technically yes however hot dipped galvanized steel resists corrosion in numerous environments for much longer than uncoated steel.

Whether it is paint or galvanised steel any coating is designed to protect the base material. Also see complete list of types properties of metals used in roof systemsfor more about galvanized steel roofing. If crawling around on a metal roof in the hot sun does. Galvalume metal roofing system properties.

Both galvanized steel and galvalume weigh 100 to 150 pounds per 100 square feet and contain about 35 recycled materials.