M-Glass Exterior Sheathing is a high performance mold and moisture resistant panel designed for direct attachment to exterior side-wall and soffit framing as a underlayment for various exterior materials such as wood, metal or vinyl siding, properly detailed Exterior Insulation Finish Systems (EIFS), masonry veneer, stucco, shingles, etc. It is produced in 1/2” and 5/8” thicknesses with the 5/8” M-Glass Exterior Sheathing having a UL classified formulated Type X core for use in approved fire rated assemblies.

American Gypsum products contain no asbestos and no detectable levels of formaldehyde.

Basic Uses

American Gypsum’s M-Glass Exterior Sheathing is manufactured to meet or exceed the requirements of ASTM C1177, and was developed for and is backed by a limited warranty for exposure up to 12 months under normal weather conditions on commercial and residential projects. M-Glass Exterior Sheathing provides mold, moisture and fire resistance protection when attached directly to exterior side-wall or soffit framing. For use as a underlayment for finishes such as wood, metal or vinyl siding, properly detailed Exterior Insulation Finish Systems (EIFS), masonry veneer, stucco, shingles, etc.