MASA/MASAP Mudsill Anchors
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Mudsill anchors have always been a time-saving alternative to anchor bolts, and the MASA anchors provide an even greater load-carrying capacity alternative for 5/8" and 1/2" mudsill anchor bolts on 2x, double-2x and 3x mudsills. It also eliminates the need for 3" square plate washers for seismic design and, in some cases, has load capacities that meet or exceed the parallel- and perpendicular-to-plate shear capacity of other cast-in-place anchors. Two versions of the MASA are available — the standard MASA for installation on standard forms and the MASAP for panelized forms.
The MASA and MASAP are code listed by ICC-ES under the 2012 and 2015 IBC® and IRC®.
- 16 gauge
- Galvanized. All available in ZMAX® coating. See Corrosion Information.
- Use all specified fasteners; see General Notes.
- Concrete shall have a minimum f'c = 2500 psi.
- Spalling — Full loads apply for spalls up to a maximum height of 1 1/4" and a maximum depth of 7/8". Any exposed portion of the mudsill anchor must be protected against possible corrosion.
- For prescriptive anchor spacing refer to the table below.
- Testing shows that these mudsill anchors can be used in lieu of code-required anchor bolts and square washer in high seismic zones. Refer to flier Easier Mudsill Anchoring: Cast-in-Place Mudsill Anchor (F-MASA) for additional information.
- Minimum MASA end distance is 4" and minimum center-to-center spacing is 8" for full load.
- For continuous load path, MASA should be installed on the same side of wall as uplift connectors.
- For installation in severe corrosion environments, refer to Cast-in-Place Corrosion for additional considerations.
Cold-Formed Steel Construction
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Product Information Tables
Prescriptive Spacing for MASA/MASAP to Replace Sill Anchor Bolts
- "Prescriptive" denotes designs per the IRC or conventional provisions of the IBC for wind speeds 100 mph or less, or for Seismic Design Category D and less (SDC E and less in IBC).
- Detached one- and two-family dwellings in SDC C may use the "Wind & SDC A&B" spacing.
- Spacing is based on the parallel to plate load direction for MASA Standard installation only.
- 5/8" diameter AB required in SDC E.
- When replacing 1/2" -diameter sill bolts use (7) 10d x 1 1/2" nails for standard installation. One out of three MASAs (33%) may be installed in One-Leg-Up installation along a wall line.
- When replacing 5/8" -diameter sill bolts use (9) 10d x 1 1/2" nails for standard installation. One out of five MASAs (20%) may be installed in One-Leg-Up installation along a wall line.
- Per Section 1613 of the 2012/2015 IBC, detached one- and two-family dwellings in SDC C may use the "Wind and SDC A&B" spacing.
- Loads are based on allowable stress design (ASD) and include the load duration factor CD (with CD = 1.6) for wind/earthquake loading. No further increase is allowed. Reduce where other loads govern.
- Minimum concrete compression strength, f'c is 2500 psi.
- Allowable loads are based on a minimum stemwall width of 6".
- For simultaneous loads in more than one direction, the connector must be evaluated using the Unity Equation.
- Per Section 1613 of the 2012/2015 IBC, detached one- and two-family dwellings in SDC C may use the "Wind and SDC A&B" allowable loads.
- For designs under the 2012/2015 IBC, sill plate size shall comply with the shearwall requirements of the 2015 Special Design Provisions for Wind and Seismic.
- MASA/MASAP may be installed using 7-nails when being used to replace a 1/2"-diameter sill bolt for use on a 2x mudsill. Install minimum 3-side fasteners.
- Nails: 10d x 1 1/2" = 0.148" dia. x 1 1/2" long. See other nail sizes and information.
|Part||IAPMO UES ER||ICC-ES ESR||City of Los Angeles||State of Florida|
ESR-2523 is an Index of many of Simpson Strong-Tie Stamped and Welded Cold-formed Steel Products for Wood or Cold-formed Steel Construction