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URFP/FRFP Retrofit Foundation Plates


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Ideal where there is minimum vertical clearance, the URFP universal retrofit foundation plate provides a retrofit method to secure the mudsill to the foundation. This design allows installation flexibility when the mudsill is offset or inset from the foundation edge. With its combination of longitudinal embossments, stiffening darts and scalloped slotted holes, the URFP allows for a one-for-one replacement of 1/2" or 5/8" mudsill anchors as well as fixity to both the SDS screws and required concrete anchorage.

The FRFP flat retrofit foundation plate connects the mudsill to the foundation and provides lateral load resistance. This design allows the Designer to maintain prescriptive requirements when filling three holes, or as an alternate, fill the two optional triangle holes and Designers can utilize increased loads and greater allowable spacing.


  • URFP — 14 gauge; FRFP — 7 gauge


  • Galvanized. May be ordered HDG; contact Simpson Strong-Tie. See Corrosion Information.


  • Use all specified fasteners; see General Notes.
  • Loads are based on test results using 1/4" x 3" Strong-Drive® SDS Heavy-Duty Connector screws, which are supplied with the URFP.
  • For URFP, alternate lag screws will not achieve published loads.
  • FRFP shall use a minimum Strong-Drive SDS Heavy-Duty Connector screw length of 2 1/2" plus the shim thickness. FRFP may be installed with 1/4" HDG lag screws. Follow code requirements for predrilling.

Related Literature

Product Information Tables

Prescriptive Spacing for URFP and FRFP to Replace Sill Anchor Bolts

Prescriptive Spacing for URFP and FRFP to Replace Sill Anchor Bolts
  1. "Prescriptive" denotes spacing requirements per the IEBC and designs per the IRC and conventional provisions of the IBC.
  2. For design in accordance with the IEBC Chapter A3, the URFP may be used as a one-for-one replacement for the alternative connections shown in Figures A3-4A, A3-4B, and A3-4C.
  3. Spacing is based on the parallel-to-plate load direction.
  4. 5/8" anchor bolt required for Seismic Design Category E.

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.

URFP/FRFP Retrofit Foundation Plates Load Table
  1. Allowable loads have been increased for wind or earthquake loading with no further increase allowed. Reduce where other loads govern.
  2. Each anchor bolt requires a standard-cut washer. The Simpson Strong-Tie® Titen HD® heavy-duty screw anchor does not require a washer.
  3. Nominal embedment depth for post-installed anchors must be 4" for SET-3G™ or AT-XP®, or use THD50400H Titen HD® screw anchors.
  4. For redwood mudsills, reduce F1 on FRFP to 820 lb. (1,395 lb. for five screws) and on URFP to 1,180 lb.
  5. For installation on SPF/HF sill plates, use 0.86 x DF/SF allowable load.

Code Reports & Compliance