TXI Masonry Cement Type S, with twice the strength of Type N, is excellent for higher strength mortars where architectural and structural demands require a higher performance masonry mortar. Reaches 1800 psi @ 28 days when proportioned in accordance with ASTM C 270 requirements. Meets ASTM C 91 specifications. Uses: Laying brick, block and stone, building or repairing chimneys, walls, planters and outdoor grills. Also, for tuck pointing joints and stuccoing walls.