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MASA/MASAP Mudsill Anchors

MASA/MASAP

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Mudsill Anchors

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

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.
    - 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.

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Sill plate/mudsill anchorage solutions for engineered and prescriptive applications into concrete or grout-filled CMU using Titen HD® (THD), MASA/MASAP, MAB/MASB, AT-XP®, SET-XP® or SET-3G™.
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MASA/MASAP Alternate Strong-Drive® SDWS Timber Screw Installation
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This letter details the alternative MASA/MASAP installation using SDWS screws — with two legs up on a 2x4 vertical rim board or blocking over a 2x or 3x sill plate.
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MASA/MASAP Reduced Spacing
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This letter provides a load adjustment for MASA/MASAP Mudsill Anchors with reduced center-to-center spacing.
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Product Information Tables

Prescriptive Spacing for MASA/MASAP to Replace Sill Anchor Bolts

Prescriptive Spacing for MASA/MASAP to Replace Sill Anchor Bolts
  1. Detached one- and two-family dwellings in SDC C may use the "Wind and SDC A&B" spacing.
  2. Spacing is based on the parallel-to-plate load direction for MASA standard installation only.
  3. 5/8" anchor bolt required for Seismic Design Category E.
  4. 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.
  5. 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.
  6. 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.

MASA/MASAP Mudsill Anchors Load Table
  1. Loads have been increased for wind or earthquake loading, with no further increase allowed. Reduce where other loads govern.
  2. Concrete shall have a minimum compressive strength of f'c = 2,500 psi.
  3. Allowable loads are based on a minimum stem wall width of 6".
  4. 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.
  5. 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.
  6. 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.
  7. 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.
  8. 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 & Compliance

Drawings

PDF DWG DXF RFA IFC SAT

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