The MASA Bottom Plate Anchor provides a time‑saving alternative to M12 and M16 cast‑in‑place anchor bolts on 45mm bottom plates. Designed to install on the formwork before the pour, they simplify concrete finishing and can easily adapt to timer stud interference.
Designing with MASA mudsill anchors also eliminates the need for 75mm square plate washers on the anchor bolts for seismic design, and in some cases offers load capacities that meet or exceed the parallel‑ and perpendicular‑to‑plate shear capacity of other cast‑in‑place anchors.
Attaches easily to the concrete formwork
Stays out of the way until needed, making slab finishing easier
Eliminates the need to pre‑drill bottom plates for anchor bolts
Adapts to timber stud placement with two installation scenarios
An alternative to M12 and M16 cast‑in‑place anchor bolts on 45mm bottom plates
Design Capacities are available on the website
Design Capacity is the lesser of (1) the Characteristic Capacity multiplied by the NZ Strength Reduction Factor (φ), and applicable the k modification factors following NZS 3603 and (2) the Serviceability Capacity which is the load at 3.2mm joint slip, which includes fastener slip and mudsill anchor deformation. Design Capacity is the minimum of test data and structural joint calculation
Limitations on Use
Use all specified fasteners
Concrete shall have a minimum f’c = 17MPa
Spalling—Full loads apply for spalls up to a maximum height of 32mm and a maximum depth of 22mm. Any exposed portion of the mudsill anchor must be protected against possible corrosion
For prescriptive anchor spacing refer to table
Minimum MASA end distance is 100mm and minimum centre‑to‑centre spacing is 200mm for full load
For continuous load path, MASA should be installed on the same side of wall as uplift connectors