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.

Galvanized vs painted steel roof.

Whether it is paint or galvanised steel any coating is designed to protect the base material. It can also be painted and comes in many different looks. Steel is used in fabrication projects primarily for its durability and strength. Underneath a painted metal roof there is a galvalume coating.

There are slight differences between stainless steel and galvanized steel. The coating corrodes instead of the core material. The standard is a 55 a z coating underneath the painted metal is a 50 a z coating. Therefore it should not be specified.

Since steel is highly versatile it s often coated with other. 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. Bare steel top painted bottom and galvanized top galvanized and painted bottom. Final thoughts on galvalume vs.

Steel is a tensile metal meaning that it has a high strength to weight ratio making it easy to work with. Paint adheres better to galvanized steel than to galvalume so it requires repainting less often. The pros cons of steel bare painted and galvanized. Galvanized steel is more durable than most other material utilized for building.

If bare galvanized deck must be field painted ensure that any mill treatment is removed before priming. Technically yes however hot dipped galvanized steel resists corrosion in numerous environments for much longer than uncoated steel. 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.

Both types of steel can be painted to improve durability. In short this is what is meant by the term galvanized it takes its name from the italian scientist luigi galvani. That coating isn t as dense. Paint on the top side will interfere with shear bond and inhibit composite action.