Galvanized Vs Painted Metal Roof

Whether it is paint or galvanised steel any coating is designed to protect the base material.

Galvanized vs painted 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. 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. Both galvanized steel and galvalume weigh 100 to 150 pounds per 100 square feet and contain about 35 recycled materials. Underneath a painted metal roof there is a galvalume coating.

But galvalume has an excellent performance life in bare exposures as well. The rust on galvanized will just continue to spread and get worse because it doesn t have that self healing property. That s the normal length of warranty on kynar 500 paint finish. With that being said the painted metal roof has a 40 year warranty on the paint and 30 year fade warranty.

Details about galvanized metal roofing are at galvanized steel roofs. Most galvalume like galvanized steel is coated. 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. Galvalume metal roofing system properties.

As far as the warranty goes metal roofs hold up great and. The metal roofing alliance recommends g 90 galvanized steel for roofing which has 90 ounces of zinc per square foot. Apply the sherwin williams paint and primer to a galvanized roof with a paintbrush or a roller specifically designed for corrugated metal. Paint adheres better to galvanized steel than to galvalume so it requires repainting less often.

That coating isn t as dense. Final thoughts on galvalume vs. Also see complete list of types properties of metals used in roof systemsfor more about galvanized steel roofing. Paint finish warranties are key to understanding the expected longevity of a galvanized or galvalume metal roof.

The coating corrodes instead of the core material. Aluminum roofing comes with paint finishes as well and have their own warranties. The standard is a 55 a z coating underneath the painted metal is a 50 a z coating. The cost of galvalume and galvalume plus are about the same as that of galvanized steel.

Both types of steel can be painted to improve durability.