Galvanized Vs Painted Steel Roof

All coated steel materials however are vulnerable to corrosion at field cut edges although galvalume is the least affected table 2 10 below click to enlarge any image lists the advantages drawbacks compatibility and life expectancy of galvanized steel roofing aluminized steel roofing galvalume aluminum copper and zinc metal.

Galvanized vs painted steel roof.

If bare galvanized deck must be field painted ensure that any mill treatment is removed before priming. Paint adheres better to galvanized steel than to galvalume so it requires repainting less often. Galvanized steel is more durable than most other material utilized for building. Steel is used in fabrication projects primarily for its durability and strength.

In short this is what is meant by the term galvanized it takes its name from the italian scientist luigi galvani. The problem with galvanized metal painted or not is that once it starts to red rust it doesn t eventually stop as galvalume does. Paint on the top side will interfere with shear bond and inhibit composite action. Bare steel top painted bottom and galvanized top galvanized and painted bottom.

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. The coating corrodes instead of the core material. 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.

Underneath a painted metal roof there is a galvalume coating. With that being said the painted metal roof has a 40 year warranty on the paint and 30 year fade warranty. Steel is a tensile metal meaning that it has a high strength to weight ratio making it easy to work with. As far as the warranty goes metal roofs hold up great and.

Final thoughts on galvalume vs. Since steel is highly versatile it s often coated with other. Therefore it should not be specified. The rust on galvanized will just continue to spread and get worse because it doesn t have that self healing property.

Whether it is paint or galvanised steel any coating is designed to protect the base material. Both types of steel can be painted to improve durability. The standard is a 55 a z coating underneath the painted metal is a 50 a z coating. There are slight differences between stainless steel and galvanized steel.