Galvanized Vs Painted Roofing

In short this is what is meant by the term galvanized it takes its name from the italian scientist luigi galvani.

Galvanized vs painted roofing. The g 60 refers to amount of metallic finish per sq ft. Final thoughts on galvalume vs. It can also be painted and comes in many different looks. The metal roofing alliance recommends g 90 galvanized steel for roofing which has 90 ounces of zinc per square foot.

The coating corrodes instead of the core material. Expands with heating and cooling. 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.

That coating isn t as dense. The rust on galvanized will just continue to spread and get worse because it doesn t have that self healing property. Galvanized steel is more durable than most other material utilized for building. Well first lets address a common misconception.

Galvalume metal roofing system properties. Also see complete list of types properties of metals used in roof systemsfor more about galvanized steel roofing. 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 problem with galvanized metal painted or not is that once it starts to red rust it doesn t eventually stop as galvalume does.

Details about galvanized metal roofing are at galvanized steel roofs. 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 s a full installation of say g 60 galvanized steel 29 gauge painted with acrylic or polyester non kynar 500 paint finishes panels charged by the square foot. Galvalume steel roofing material has so many advantages to consider with the first one being longevity of life.

The standard is a 55 a z coating underneath the painted metal is a 50 a z coating. Because of the coating this material is resistant to atmospheric corrosion and can last from 50 to 75 years outlasting comparable galvanized roofing material. Paint adheres better to galvanized steel than to galvalume so it requires repainting less often. There are slight differences between stainless steel and galvanized steel.

Technically yes however hot dipped galvanized steel resists corrosion in numerous environments for much longer than uncoated steel. That s the normal length of warranty on kynar 500 paint finish. Why choose a painted metal roof.