Primary Causes of Grill DamageBefore we get into how you can proactively protect your grill from the elements, it’s important to better understand the potential sources of damage that are out there. Covers, especially vinyl ones, tend to trap moisture, especially in regions with high humidity. Like moisture, mold is more prevalent in humid climates. Characteristics of Quality CoversKeeping your grill covered is your best line of defense against the elements, but the kind you buy matters. Here’s what to look for when considering a grill cover.