The different models of mudsill anchors are designed for specific applications: MASB is used in concrete masonry units. MASB: Fill CMU cell with concrete grout first, then place MASB into the grouted cell and adjust into position. Attach mudsill to anchor only after the concrete grout cures. CMU shall have a minimum 1500 P.S.I. The MASB mudsill anchors were tested in standard 8″ CMU. 2×4 or 6×8; install with (8) 10d x 1-1/2″ fasteners. 16-gauge. ZMAX coating.