Galvanized Vs Painted Steel Roof

Bare steel top painted bottom and galvanized top galvanized and painted bottom.

Galvanized vs painted steel roof.

Both types of steel can be painted to improve durability. It can also be painted and comes in many different looks. Paint adheres better to galvanized steel than to galvalume so it requires repainting less often. The standard is a 55 a z coating underneath the painted metal is a 50 a z coating.

The pros cons of steel bare painted and galvanized. If bare galvanized deck must be field painted ensure that any mill treatment is removed before priming. Since steel is highly versatile it s often coated with other. Galvanized steel is more durable than most other material utilized for building.

As far as the warranty goes metal roofs hold up great and. Paint on the top side will interfere with shear bond and inhibit composite action. Steel is a tensile metal meaning that it has a high strength to weight ratio making it easy to work with. 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.

That coating isn t as dense. 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. With that being said the painted metal roof has a 40 year warranty on the paint and 30 year fade warranty. Whether it is paint or galvanised steel any coating is designed to protect the base material.

Underneath a painted metal roof there is a galvalume 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. The coating corrodes instead of the core material. Steel is used in fabrication projects primarily for its durability and strength.

Therefore it should not be specified. 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. Technically yes however hot dipped galvanized steel resists corrosion in numerous environments for much longer than uncoated steel. The rust on galvanized will just continue to spread and get worse because it doesn t have that self healing property.