Author Archives: Gene Johnson

Caution to Contractors: Bending Techniques for Aluminum Differ from Steel

When metal roofing manufacturers first introduced aluminum material for standing seam roofing, much of the aluminum produced was .032 thickness.

However, over the years the building products industry has been gravitating to thicker roofing and trim material, especially in aluminum. And, Dade County Florida enacted new wind uplift rules for metal roofing that required the use of .040 aluminum for roofs and .050 thickness for trim material to meet the rule requirements.

Consequently, contractors were transitioning from the use of .018 to .024 thick Galvalume or Hot Dipped Galvanized steel roofing and trim products to .032 to .050 thick Aluminum. Many contractors assumed aluminum bent the same as steel and therefore thought little adjustment was needed to make crisp bends on aluminum as they had done with steel. This resulted in some contractors bending these heavier aluminum products beyond their tensile strength limits resulting in cracking of the metal and paint as well as leaving a silver look from the crazed aluminum under the paint. Continue reading

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