Weather & Performance ·
Class 4 Hail Rating for Metal Roofs: What UL 2218 Does and Does Not Mean
How the UL 2218 impact test works, what Class 4 does and does not promise, and how gauge, profile and finish change the way a metal roof handles hail.
How metal roofs handle what the sky throws at them: hail and the UL 2218 Class 4 rating, hurricane and straight-line wind, wildfire and ember attack, summer heat and cool-roof reflectivity, and the two myths that will not die, noise and lightning. Each guide separates what the test standards actually say from what a sales pitch implies.
Weather & Performance ·
How the UL 2218 impact test works, what Class 4 does and does not promise, and how gauge, profile and finish change the way a metal roof handles hail.
Weather & Performance ·
Loud in the rain, a lightning magnet, prone to rust, hot in summer, bad for cell signal: the common metal roof worries and what is actually true.
Weather & Performance ·
Metal does not burn, but the fire rating belongs to the whole roof assembly. What Class A means, where embers get in, and how to harden a roof in…
Weather & Performance ·
What wind ratings for metal roofs actually mean, how uplift is tested, and why clip spacing, edge metal and installation decide what stays on in a…
Weather & Performance ·
What a cool roof is, how reflective metal roof finishes lower attic heat, which climates benefit most and why insulation and ventilation still do…