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MASA/MASAP Mudsill Anchors


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Concrete Connectors

This product's information may differ depending on the category of use. You are currently viewing details related to Concrete Connectors. You can also view product information related to the category: Mudsill Anchors

Mudsill anchors have always been a time-saving alternative to anchor bolts, and the MASA anchors provide even greater load-carrying capacity alternative. For 5/8" and 1/2" mudsill anchor bolts on bottom tracks, the MASA 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 2006, 2009, 2012 and 2015 IBC® and IRC® and have been tested to meet the requirements of ICC-ES acceptance criteria AC-398 for cracked and uncracked concrete.

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 bottom track and aligning holes
  • Flat design eliminates chances of modification in prefabricated walls
  • Eliminates the need to modify CFS 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


  • 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 = 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.
    – 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.

Related Literature

Load Tables

Allowable Loads for MASA/MASAP Cast-in-Place Mudsill Anchor on CFS Track

  1. Allowable loads are governed by tests and may not be increased (CD = 1.0).
  2. The tabulated allowable (ASD) loads may be multiplied by 1.6 for designs for wind and in SDC A&B, and by 1.4 for designs in SDC C through F to obtain the LRFD loads.
  3. Minimum concrete compression strength, f'c is 2,500 psi.
  4. Allowable loads are based on a minimum stemwall width of 6".
  5. For simultaneous loads in more than one direction, the connector must be evaluated using the Unity Equation.
  6. Per Section 1613 of the 2009, 2012 and 2015 IBC, detached one- and two-family dwellings in SDC C may use the "Wind and SDC A&B" allowable loads.
  7. Parallel-to-Track loads for One-Leg-Up Installation: SDC A–C = 1,025 lb., SDC C–F = 860 lb.
  8. See more information on Simpson Strong-Tie fasteners.

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


Part Orthographic Perspective
MASA Front View
MASA Left View
MASA Right View
High Wind Resistant Construction Detail D56: Sill Plate to Foundation - HWRC D56 Sill Plate to Foundation
High Wind Resistant Construction Detail D57: Sill Plate to Foundation - HWRC D57 Sill Plate to Foundation
MASA Perspective View
MASAP Front View
MASAP Left View
MASAP Right View
MASAP Perspective View