Galvanized Vs Painted Metal Roof

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

Galvanized vs painted metal roof.

Aluminum roofing comes with paint finishes as well and have their own warranties. The coating corrodes instead of the core material. The problem with galvanized metal painted or not is that once it starts to red rust it doesn t eventually stop as galvalume does. The rust on galvanized will just continue to spread and get worse because it doesn t have that self healing property.

The metal roofing alliance recommends g 90 galvanized steel for roofing which has 90 ounces of zinc per square foot. Also see complete list of types properties of metals used in roof systemsfor more about galvanized steel roofing. Apply the sherwin williams paint and primer to a galvanized roof with a paintbrush or a roller specifically designed for corrugated metal. Final thoughts on galvalume vs.

Underneath a painted metal roof there is a galvalume coating. As far as the warranty goes metal roofs hold up great and. 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. Both types of steel can be painted to improve durability.

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. Galvalume metal roofing system properties. Most galvalume like galvanized steel is coated. Technically yes however hot dipped galvanized steel resists corrosion in numerous environments for much longer than uncoated steel.

The cost of galvalume and galvalume plus are about the same as that of galvanized steel. Whether it is paint or galvanised steel any coating is designed to protect the base material. That coating isn t as dense. Both galvanized steel and galvalume weigh 100 to 150 pounds per 100 square feet and contain about 35 recycled materials.

The standard is a 55 a z coating underneath the painted metal is a 50 a z coating. But galvalume has an excellent performance life in bare exposures as well. With that being said the painted metal roof has a 40 year warranty on the paint and 30 year fade warranty. If crawling around on a metal roof in the hot sun does.

Paint finish warranties are key to understanding the expected longevity of a galvanized or galvalume metal roof.