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MASA™ Mudsill Anchor

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

The MASA is a mudsill anchor that provides a time-saving alternative to anchor bolts. This mudsill anchor 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. The MASA is ideal for installation on standard forms and is code listed by ICC-ES under the 2012, 2015, 2018 and 2021 IBC® and IRC®.

Key Features

  • Attaches easily to the concrete form for quick installation
  • Lays flat on the form board so there is no anchor bolt to finish around
  • None of the labor costs involved in drilling plates and aligning holes
  • Flat design eliminates chances of modification in prefabricated walls
  • Eliminates the need to notch studs because of intersection with anchor bolt placement
  • Reduces the chance of having to retrofit anchors because of missing or misplaced anchor bolts

Material

  • 16 gauge

Finish

  • Galvanized or ZMAX® coating; see Corrosion Information

Installation

  • 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.
  • 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 washers in high seismic zones.
  • Minimum end distance is 4" and minimum center-to-center spacing is 8" for full load. For reduced center-to-center spacing and/or end distance, see engineering letter MASA/MASAP Reduced Spacing (L-C-MASASPCNG).
  • For a continuous load path, MASA should be installed on the same side of the wall as uplift connectors.
  • For installation in severe corrosion environments, refer to General Corrosion Risks for additional considerations.

Patent Information

  • US Patent 8,484,917

Related Literature

High Wind Guide
F-C-HWG23
A comprehensive guide to help designers select the most appropriate connections for high-wind regions.
Product Guide
Conectores para la construcción con madera 2024–2025
C-C-2024SP
El catálogo incluye información sobre nuevos productos, así como especificaciones e instrucciones de instalación aplicables para conectores estructurales de madera a madera y de madera a concreto.
Catalog
Wood Construction Connectors – Canadian Limit States Design
C-C-CAN2025
A complete product and application catalogue including load tables and installation information for wood-to-wood, wood-to-concrete and wood-to-masonry connectors.
Catalog
Connecteurs pour constructions en bois — Conception aux états limites canadiens
C-C-CAN2022CF
Un catalogue complet sur les produits et les applications, y compris de l’information sur l’installation et les tableaux de charge pour les connecteurs bois-à-bois, bois-à-béton et bois-à-maçonnerie.
Catalog
Wood Construction Connectors 2024-2025
C-C-2024
A catalog including new product information as well as any applicable specification and installation instructions for wood-to-wood and wood-to-concrete structural connectors.
Catalog
Connectors for Cold-Formed Steel Construction Catalog
C-CF-2023
A catalog for Connectors for Cold-Formed Steel Construction products and solutions.
Catalog
Installer's Pocket Guide
S-C-INSTALL22
A bilingual pocket installation guide for connectors.
Product Guide
Connector Solutions to Meet the Wall Bracing Requirements of the International Residential Code®
T-C-WALLBRACE23
A technical bulletin providing technical information about wall bracing methods and code sections that require connectors (e.g., holdowns or straps) and anchors.
Technical Bulletin
Strengthening Dwellings in Tornado-Prone Areas
T-C-TORNADO23
A technical bulletin detailing connector and fastener solutions for economically building stronger homes to resist the damage caused by lower-speed (EF0 to EF2) tornadoes.
Technical Bulletin
Code-Compliant Sill Plate Anchorage Solutions
T-A-SILPLANCH23
A technical bulletin providing an overview of code-compliant sill plate anchorage solutions.
Technical Bulletin
MASA/MASAP Alternate Strong-Drive® SDWS Timber Screw Installation
L-C-ALTMASA22
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.
Engineering Letter
MASA/MASAP Reduced Spacing
L-C-MASASPCNG24
This letter provides a load adjustment for MASA/MASAP Mudsill Anchors with reduced center-to-center spacing.
Engineering Letter
North Carolina Residential Code: Alternate Sill Plate Anchors
L-NCRCALTANCR24
Alternate Sill Plate Anchors for Section 4504 of the 2012 North Carolina Residential Building Code.
Engineering Letter

Product Information Table

Fastener Production Information and Stuff & Things
Model No. Ga. Coating/Material Packaging Qty.
MASA 16 Zinc Galvanized, G90 1
MASA-B 16 Zinc Galvanized, G90 2500
MASAZ 16 ZMAX® 1

Load Tables

    These products are available with additional corrosion protection.

Model No. Sill Size Fasteners (in.) Allowable Loads
Sides Top Uncracked Cracked
Wind and SDC A&B5,6 SDC C–F6 Wind and SDC A&B5,6 SDC C–F6
Uplift F1 F2 Uplift F1 F2 Uplift F1 F2 Uplift F1 F2
Standard Installation – Attached to DF/SP Sill Plate
MASA 2x4, x6, x8, x10 (3) 0.148 x 1 1/2 (6) 0.148 x 1 1/2 920 1,475 1,095 745 1,235 1,045 750 1,475 875 660 1,235 765
3x4, 3x6 (5) 0.148 x 1 1/2 (4) 0.148 x 1 1/2 630 1,165 725 550 1,020 725 475 1,165 725 415 1,020 640
One-Leg-Up Installation – Attached to DF/SP Sill Plate and DF/SP Stud
MASA 2x4, x6, x8, x10 (6) 0.148 x 1 1/2 (3) 0.148 x 1 1/2 755 965 995 660 845 995 570 965 930 500 845 810
3x4, 3x6 (7) 0.148 x 1 1/2 (2) 0.148 x 1 1/2 — 760 — — 665 — — 760 — — 665 —
Two-Legs-Up Installation – Attached to DF/SP Sill Plate and Rimboard or Blocking
MASA 2x4, x6, x8, x10, 3x4, 3x6 (9) 0.148 x 1 1/2 — 810 1,105 865 740 965 755 620 1,105 630 560 965 550
Double 2x Installation – Attached to DF/SP Sill Plate
MASA Double 2x4, Double 2x6 (5) 0.148 x 1 1/2 (2) 0.148 x 1 1/2 840 1,030 785 735 900 785 635 1,030 785 555 900 785
Standard Installation – Attached to Hem Fir Sill Plate
MASA 2x4, x6, x8, x10 (3) 0.148 x 1 1/2 (6) 0.148 x 1 1/2 790 1,250 940 640 1,060 900 650 1,250 755 570 1,060 660
3x4, 3x6 (5) 0.148 x 1 1/2 (4) 0.148 x 1 1/2 535 1,005 625 475 875 625 410 1,005 625 355 875 550
One-Leg-Up Installation – Attached to Hem Fir Sill Plate and HF/SPF Stud
MASA 2x4, x6, x8, x10 (6) 0.148 x 1 1/2 (3) 0.148 x 1 1/2 650 830 855 565 725 855 490 830 795 430 725 695
3x4, 3x6 (7) 0.148 x 1 1/2 (2) 0.148 x 1 1/2 — 670 — — 570 — — 670 — — 570 —
Two-Legs-Up Installation – Hem Fir Sill Plate and HF/SPF Rimboard or Blocking
MASA 2x4, x6, x8, x10, 3x4, 3x6 (9) 0.148 x 1 1/2 — 700 950 745 635 830 650 545 950 540 480 830 475
Double 2x Installation – Attached to Hem Fir Sill Plate
MASA Double 2x4, Double 2x6 (5) 0.148 x 1 1/2 (2) 0.148 x 1 1/2 720 890 675 630 775 675 545 890 675 475 775 675
  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 Straps and Ties General Notes.
  5. Per Section 1613 of the 2012/2015/2018/2021 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 2012/2015/2018/2021 IBC, sill plate size shall comply with the shearwall requirements of the 2015 or 2021 Special Design Provisions for Wind and Seismic.
  7. 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.

Prescriptive Spacing for MASA to Replace Sill Anchor Bolts

Model No. Anchor Bolt Size to Replace Anchor Bolt Spacing to Replace MASA Spacing
DF/SP 2x Sill Plate HF 2x Sill Plate
Wind and SDC A&B SDC C–E 3 Wind and SDC A&B SDC C–E 3
MASA 1/2" diameter 6' o.c. 6'–0" 6'–0" 6'–0" 6'–0"
4' o.c. 4'–0" 4'–0" 4'–0" 4'–0"
MASA 5/8" diameter 6' o.c. 5'–4" 4'–6" 5'–1" 4'–4"
4' o.c. 3'–6" 3'–1" 3'–5" 2'–11"
  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 2012/2015/2018/2021 IBC, detached one- and two-family dwellings in SDC C may use the "Wind and SDC A&B" spacing.

Code Reports & Compliance

Drawings

PDF DWG DXF RFA IFC SAT

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