NexaGuard is Cover Up LLC’s line of Magnesium Oxide (MGO) sheathing boards. Unlike OSB, plywood, or gypsum, MGO panels are mineral-based, which means they don’t rot, warp, or absorb moisture. They’re non-combustible, resistant to mold and pests, and built to last through the full life of a structure. Use them for exterior wall sheathing, subflooring, or underlayment.

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Key Benefits

MGO sheathing outperforms traditional materials on every front. Here’s what you get:

  • Denser than OSB, plywood, or gypsum, with better rigidity for the life of the building.

  • NexaGuard boards are non-combustible with a Class A fire rating.

  • Rated for 180 days of weather exposure, far longer than gypsum-based alternatives. No moisture = No Mold

  • The mineral composition resists mold, mildew, and insects naturally.