Galvanized Vs Painted Steel Roof

Paint on the top side will interfere with shear bond and inhibit composite action.

Galvanized vs painted steel roof.

Steel is used in fabrication projects primarily for its durability and strength. Therefore it should not be specified. The problem with galvanized metal painted or not is that once it starts to red rust it doesn t eventually stop as galvalume does. Technically yes however hot dipped galvanized steel resists corrosion in numerous environments for much longer than uncoated steel.

In short this is what is meant by the term galvanized it takes its name from the italian scientist luigi galvani. As far as the warranty goes metal roofs hold up great and. Final thoughts on galvalume vs. Underneath a painted metal roof there is a galvalume coating.

Since steel is highly versatile it s often coated with other. There are slight differences between stainless steel and galvanized steel. That coating isn t as dense. Galvanized steel is more durable than most other material utilized for building.

With that being said the painted metal roof has a 40 year warranty on the paint and 30 year fade warranty. 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 pros cons of steel bare painted and galvanized. The standard is a 55 a z coating underneath the painted metal is a 50 a z coating.

Bare steel top painted bottom and galvanized top galvanized and painted bottom. The coating corrodes instead of the core material. 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.

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. Both types of steel can be painted to improve durability. 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. The rust on galvanized will just continue to spread and get worse because it doesn t have that self healing property.