Galvanized Vs Painted Roofing

Both types of steel can be painted to improve durability.

Galvanized vs painted roofing.

With that being said the painted metal roof has a 40 year warranty on the paint and 30. The problem with galvanized metal painted or not is that once it starts to red rust it doesn t eventually stop as galvalume does. Whether it is paint or galvanised steel any coating is designed to protect the base material. Well first lets address a common misconception.

The rust on galvanized will just continue to spread and get worse because it doesn t have that self healing property. Underneath a painted metal roof there is a galvalume coating. The metal roofing alliance recommends g 90 galvanized steel for roofing which has 90 ounces of zinc per square foot. That coating isn t as dense.

Technically yes however hot dipped galvanized steel resists corrosion in numerous environments for much longer than uncoated steel. The standard is a 55 a z coating underneath the painted metal is a 50 a z coating. 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. In short this is what is meant by the term galvanized it takes its name from the italian scientist luigi galvani.

Expands with heating and cooling. 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. The g 60 refers to amount of metallic finish per sq ft. Details about galvanized metal roofing are at galvanized steel roofs.

Why choose a painted metal roof. Because of the coating this material is resistant to atmospheric corrosion and can last from 50 to 75 years outlasting comparable galvanized roofing material. Galvanized steel is more durable than most other material utilized for building. Galvalume steel roofing material has so many advantages to consider with the first one being longevity of life.

Also see complete list of types properties of metals used in roof systemsfor more about galvanized steel roofing. That s the normal length of warranty on kynar 500 paint finish. The coating corrodes instead of the core material. Galvalume metal roofing system properties.

With corrugated metal roofing it starts in the 4 00 to 5 00 per sq. It can also be painted and comes in many different looks. There are slight differences between stainless steel and galvanized steel.