Gold Bond® eXP® Sheathing is a moisture and mold resistant gypsum panel designed for attachment to the outside of sidewall and soffit framing as a water resistant underlayment for various exterior materials. eXP Sheathing is manufactured with an enhanced moisture and mold resistant core and facer. The facer is composed of a coated fiberglass mat with Purple® color which provides superior weather resistance capabilities. eXP Sheathing is lightweight, scores and cuts easily, and is specially coated on the front, back and sides for easy handling.