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No, it doesn't matter. Regardless of which side faces out during installation, you can expect the same great performance that has made USG Durock® Brand Cement Board the preferred choice of professionals and do-it-yourselfers for decades.

The purpose of the dual surfaces (one smooth side, one textured side) on USG Durock® Brand Cement Board is to better receive mastic and thin-set mortar. The smooth side is ideal for mastic applications, as it increases adhesive coverage. The textured side is ideal for mortar applications, as it enhances bonding and reduces tile slip. That said, mastic or thin-set mortar can be used on either side of the board without compromising performance.