Galvanized Vs Painted Roofing

The metal roofing alliance recommends g 90 galvanized steel for roofing which has 90 ounces of zinc per square foot.

Galvanized vs painted roofing.

Galvanized steel is more durable than most other material utilized for building. Whether it is paint or galvanised steel any coating is designed to protect the base material. Well first lets address a common misconception. Final thoughts on galvalume vs.

Because of the coating this material is resistant to atmospheric corrosion and can last from 50 to 75 years outlasting comparable galvanized roofing material. Galvalume steel roofing material has so many advantages to consider with the first one being longevity of life. 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. Galvalume metal roofing system properties.

Paint adheres better to galvanized steel than to galvalume so it requires repainting less often. The standard is a 55 a z coating underneath the painted metal is a 50 a z coating. Details about galvanized metal roofing are at galvanized steel roofs. 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 g 60 refers to amount of metallic finish per sq ft. With that being said the painted metal roof has a 40 year warranty on the paint and 30. Technically yes however hot dipped galvanized steel resists corrosion in numerous environments for much longer than uncoated steel. With corrugated metal roofing it starts in the 4 00 to 5 00 per sq.

Both types of steel can be painted to improve durability. The rust on galvanized will just continue to spread and get worse because it doesn t have that self healing property. Why choose a painted metal roof. 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. It can also be painted and comes in many different looks. The coating corrodes instead of the core material. Underneath a painted metal roof there is a galvalume coating.

Expands with heating and cooling. 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.