MASA/MASAP Mudsill Anchors
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Mudsill Anchors
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Product Details
Mudsill anchors have always been a time-saving alternative to anchor bolts, and the MASA anchors provide a great 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 allowable loads that meet or exceed the parallel- and perpendicular-to-plate shear loads 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, 2015 and 2018 IBC® and IRC®.
Key Features
- Attaches easily to the concrete form for quick installation
- MASA lays flat on the form board so there is no anchor bolt to finish
- No labor costs involved in drilling plates and aligning holes
- Flat design eliminates chances of modification in prefabricated walls
- Eliminates the need to notch studs due the anchor bolts being placed where it will interfere
- Reduces the chance of having to retrofit anchors because of missing or misplaced anchor bolts
Material
- 16 gauge
Finish
- Galvanized. All available in ZMAX® coating. See Corrosion Information.
Installation
- Use all specified fasteners; see General Notes.
- MASA/MASAP
- Concrete shall have a minimum f'c = 2,500 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 General Corrosion Risks for additional considerations.
Related Literature
Product Information Tables
Prescriptive Spacing for MASA/MASAP to Replace Sill Anchor Bolts
- Detached one- and two-family dwellings in SDC C may use the "Wind and SDC A&B" spacing.
- Spacing is based on the parallel-to-plate load direction for MASA standard installation only.
- 5/8" anchor bolt required for Seismic Design Category E.
- When replacing 1/2"-diameter sill bolts, use (7) 0.148" x 1 1/2" nails for standard installation. One out of three MASA anchors (33%) may be installed in one-leg-up installation along a wall line.
- When replacing 5/8"-diameter sill bolts, use (9) 0.148" x 1 1/2" nails for standard installation. One out of five MASA anchors (20%) may be installed in one-leg-up installation along a wall line.
- Per Section 1613 of the 2012/2015/2018 IBC, detached one- and two-family dwellings in SDC C may use the "Wind and SDC A&B" spacing.
Load Tables
These products are available with additional corrosion protection. Additional products on this page may also be available with this option, check with Simpson Strong-Tie for details.
- Loads have been increased for wind or earthquake loading, with no further increase allowed. Reduce where other loads govern.
- Concrete shall have a minimum compressive strength of f'c = 2,500 psi.
- Allowable loads are based on a minimum stem wall width of 6".
- For simultaneous loads in more than one direction, the connector must be evaluated using the Unity Equation, as described in General Instructions for the Designer.
- Per Section 1613 of the 2012/2015/2018 IBC, detached one- and two-family dwellings in SDC C may use the "Wind and SDC A&B" allowable loads.
- For designs under the 2012/2015/2018 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 three-side fasteners.
- Fasteners: Nail dimensions in the table are listed diameter by length. For additional information, see Fastener Types and Sizes Specified for Simpson Strong-Tie Connectors.
Code Reports
| Part | IAPMO UES ER | ICC-ES ESR | City of Los Angeles | State of Florida |
|---|---|---|---|---|
| MASA | ESR-2555 ESR-2523 | RR25851 | FL13326 | |
| MASAP | ESR-2555 ESR-2523 | RR25851 | FL13326 | |
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 |
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