MSI Premium Black XL RockmountBlack large format stacked stone veneer panel MSI Premium Black XL Rockmount carries fewer joints and longer continuous coverage than standard Rockmount, designed for feature elevations and full wall installs. Across a full chimney elevation or a long accent wall, the panel format keeps visual continuity intact while the corner pieces resolve the outside corner detail in matched colorway. Mounted via construction adhesive and mechanical fastener, the