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Steel Strong-Wall® Two-Story Stacked-On Concrete Foundations

Simpson Strong-Tie® offers a complete stacked-wall solution for two-story applications. This Steel Strong-Wall Shearwall option combines simplified installation with superior performance.

  • Some of the highest loads in the industry and design procedures that account for cumulative overturning
  • Complete concrete-anchorage designs for two-story applications (foundation design by designer)
  • No bearing plates to install, walls can now be placed flush against a corner
  • Uses the same anchor bolt template as single-story installation
  • Compression loads transferred by nut/rod — reducing wood crushing under load

Material: Vertical Panel—10 gauge
Finish: Vertical Panel—Galvanized Top and Base Plates—Simpson Strong-Tie gray paint

Codes: ICC-ES ESR-1679:
City of LA Building Code Supplement;
State of Florida FL5113

Top Wall:

Drawing: Top Wall

Bottom Wall:

Drawing: Bottom Wall

Suggested Example Specification: SSW18x8 over SSW18x10-STK

Two-Story Stacked-Wall Connection Kit

Table: Two-Story Stacked-Wall Connection Kit
  1. Two heavy hex nuts included with each wall
Drawing: Two-Story Stacked Installation
Two-Story Stacked Installation

Two-Story Stacked Wall Product Data - Bottom Walls

Model No. W (in.) H (in.) T (in.) Anchor Bolts Number of Screws in Top of Wall
Qty. Dia. (in.)
SSW15x8-STK 15 93 1/4 3 1/2 2 1 6
SSW18x8-STK 18 93 1/4 3 1/2 2 1 9
SSW21x8-STK 21 93 1/4 3 1/2 2 1 12
SSW24x8-STK 24 93 1/4 3 1/2 2 1 14
SSW15x9-STK 15 105 1/4 3 1/2 2 1 6
SSW18x9-STK 18 105 1/4 3 1/2 2 1 9
SSW21x9-STK 21 105 1/4 3 1/2 2 1 12
SSW24x9-STK 24 105 1/4 3 1/2 2 1 14
SSW15x10-STK 15 117 1/4 3 1/2 2 1 6
SSW18x10-STK 18 117 1/4 3 1/2 2 1 9
SSW21x10-STK 21 117 1/4 3 1/2 2 1 12
SSW24x10-STK 24 117 1/4 3 1/2 2 1 14
SSW15x11-STK 15 129 1/4 5 1/2 2 1 6
SSW18x11-STK 18 129 1/4 5 1/2 2 1 9
SSW21x11-STK 21 129 1/4 5 1/2 2 1 12
SSW24x11-STK 24 129 1/4 5 1/2 2 1 14
SSW15x12-STK 15 141 1/4 5 1/2 2 1 6
SSW18x12-STK 18 141 1/4 5 1/2 2 1 9
SSW21x12-STK 21 141 1/4 5 1/2 2 1 12
SSW24x12-STK 24 141 1/4 5 1/2 2 1 14
SSW18x13-STK 18 153 1/4 5 1/2 2 1 9
SSW21x13-STK 21 153 1/4 5 1/2 2 1 12
SSW24x13-STK 24 153 1/4 5 1/2 2 1 14
  1. See Standard Application on Concrete Foundations for product data on top walls.

Installation Notes

  • Do not cut the Steel Strong-Wall or enlarge existing holes, doing so will compromise the performance of the wall.
  • Do not use an impact wrench to tighten nuts on the anchor bolts.
  • For additional shim thickness, see detail 5/SSW2 and 9/SSW2.

Shear-Transfer Plate Fasteners

Table: Shear-Transfer Plate Fasteners
Drawing: Two-Story Stacked Installation