Galvanized Vs Painted Metal Roof

The coating corrodes instead of the core material.

Galvanized vs painted metal roof.

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. 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. 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. As far as the warranty goes metal roofs hold up great and.

Final thoughts on galvalume vs. Both types of steel can be painted to improve durability. If crawling around on a metal roof in the hot sun does. That coating isn t as dense.

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. 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.

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. Galvalume metal roofing system properties. The standard is a 55 a z coating underneath the painted metal is a 50 a z coating.

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. 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.

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. But galvalume has an excellent performance life in bare exposures as well. Underneath a painted metal roof there is a galvalume coating.

Paint adheres better to galvanized steel than to galvalume so it requires repainting less often.