Galvanized Vs Painted Steel Roof

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

Galvanized vs painted steel roof.

The rust on galvanized will just continue to spread and get worse because it doesn t have that self healing property. 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. As far as the warranty goes metal roofs hold up great and. Galvanized steel is more durable than most other material utilized for building.

The standard is a 55 a z coating underneath the painted metal is a 50 a z coating. Underneath a painted metal roof there is a galvalume coating. It can also be painted and comes in many different looks. 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.

The problem with galvanized metal painted or not is that once it starts to red rust it doesn t eventually stop as galvalume does. Both types of steel can be painted to improve durability. There are slight differences between stainless steel and galvanized steel. Paint on the top side will interfere with shear bond and inhibit composite action.

Therefore it should not be specified. That coating isn t as dense. Paint adheres better to galvanized steel than to galvalume so it requires repainting less often. Final thoughts on galvalume vs.

The pros cons of steel bare painted and galvanized. The coating corrodes instead of the core material. Since steel is highly versatile it s often coated with other. Steel is used in fabrication projects primarily for its durability and strength.

If bare galvanized deck must be field painted ensure that any mill treatment is removed before priming. 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. With that being said the painted metal roof has a 40 year warranty on the paint and 30 year fade warranty. In short this is what is meant by the term galvanized it takes its name from the italian scientist luigi galvani.