Galvanized Vs Painted Metal Roofing

Galvanized steel is more durable than most other material utilized for building.

Galvanized vs painted metal roofing. That s the normal length of warranty on kynar 500 paint finish. The heavier the zinc coating the longer the protection. It can also be painted and comes in many different looks. Paint finish warranties are key to understanding the expected longevity of a galvanized or galvalume metal roof.

Paint does not adhere as well to galvalume so the aesthetics may not be as good. For these reasons galvalume metal roofs are much more popular. Lets dive in a little. We get this question a lot.

Should i buy galvalume metal roofing or should i buy painted metal roofing. Paint adheres better to galvanized steel than to galvalume so it requires repainting less often. In short this is what is meant by the term galvanized it takes its name from the italian scientist luigi galvani. 2 a new bare galvanized or galvalume roof will reflect more solar energy than most painted colors.

Both types of steel can be painted to improve durability. 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. Whether it is paint or galvanised steel any coating is designed to protect the base material. Galvalume is a sheet steel product covered with an aluminum zinc.

To protect against corrosion the steel is bonded to a layer of zinc which works as a sacrificial coating on the surface and also offers some protection to cut edges and nicks by flowing to these areas. 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. Aluminum roofing comes with paint finishes as well and have their own warranties.

Painted metal roof vs. The coating corrodes instead of the core material. Also galvalume costs more than galvanized metal roofing but the fact that a galvalume metal roof will last up to twice as long as a galvanized roof of the same thickness could make up the difference. Final thoughts on galvalume vs.

There are slight differences between stainless steel and galvanized steel. 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. Galvanized steel metal roofing system properties.

However over time the reflectance of galvalume drops some but the reflectance of galvanized drops significantly painted roofs have less change in relectance over time.