Galvanized Vs Painted Metal Roof

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

Galvanized vs painted metal roof.

Paint finish warranties are key to understanding the expected longevity of a galvanized or galvalume metal roof. Apply the sherwin williams paint and primer to a galvanized roof with a paintbrush or a roller specifically designed for corrugated metal. Most galvalume like galvanized steel is coated. The standard is a 55 a z coating underneath the painted metal is a 50 a z coating.

Whether it is paint or galvanised steel any coating is designed to protect the base material. That coating isn t as dense. But galvalume has an excellent performance life in bare exposures as well. The cost of galvalume and galvalume plus are about the same as that of galvanized steel.

With that being said the painted metal roof has a 40 year warranty on the paint and 30 year fade warranty. Final thoughts on galvalume vs. 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. Underneath a painted metal roof there is a galvalume coating.

The coating corrodes instead of the core material. Galvalume metal roofing system properties. The problem with galvanized metal painted or not is that once it starts to red rust it doesn t eventually stop as galvalume does. Details about galvanized metal roofing are at galvanized steel roofs.

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. Technically yes however hot dipped galvanized steel resists corrosion in numerous environments for much longer than uncoated steel. The metal roofing alliance recommends g 90 galvanized steel for roofing which has 90 ounces of zinc per square foot.

That s the normal length of warranty on kynar 500 paint finish. Also see complete list of types properties of metals used in roof systemsfor more about galvanized steel roofing. Aluminum roofing comes with paint finishes as well and have their own warranties. Both types of steel can be painted to improve durability.

If crawling around on a metal roof in the hot sun does.