Substrates and Coatings 101 a Roofer’s Guide to Metal Coatings

Written by Small Business Magazine on December 2nd, 2016. Posted in Dlc coating, Low friction coatings, Thermal spray coatings

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When installing a metal roof, an architectural company has to make sure that the materials that it uses are able to withstand the elements and meet the builders’ long-term expectations. That’s why steel substrates and metal coatings are important to research in order to make informed decisions and ensure quality performance.


A substrate is the surface where a coating is applied. Galvanized and Galvalume steel coatings are the most popular choices for metal roofs. Both materials are coated with zinc, while Galvalume is coated with aluminum as well.

Galvanized substances are abbreviated to terms like G100 and G60. The number signifies how much zinc is contained in every square foot of substrate. G100 contains one ounce, while G60 contains .6 ounces, and so on. The greater