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CD Holdown

SECURE AND HOLD DOWN SHEAR WALLS TO THE STRUCTURE FOUNDATION

ClarkDietrich holdowns provide cost-effective shearwall attachment and are used to transfer tension loads between floors or from structural members to the foundation.

Two-piece welded construction comes in three sizes for optimal performance. Installation is made easy with prepunched bolt holes. 

Material: 7 Gauge (179mil) with 1/2" bearing plate
Anchor hole size:  7/8" x 1-1/8" for CD8-S, CD8-B, CD10-S and CD10-B;  1" x 1-1/8" for CD15-S and CD15-B

Product Data & Ordering Information

Product codeGaugeMilsDesign
Thickness
Minimum
Thickness
HeightPackaging
CD8-S71790.188"0.1713"11"Dependent on
Order Quantity
CD10-S71790.188"0.1713"13-1/2"
CD15-S71790.188"0.1713"19"

Alternative Products

Product Data & Ordering Information

Product codeGaugeMilsDesign
Thickness
Minimum
Thickness
HeightPackaging
CD8-B71790.188"0.1713"11"Dependent on
Order Quantity
CD10-B71790.188"0.1713"13-1/2"
CD15-B71790.188"0.1713"19"

Alternative Products

Load Tables

 

Reference section R603.9.4.2 of the International Residential Code (IRC) for holdown requirements in residential applications. Consult the engineer of record for commercial applications.

Installation

  • Install the holdowns using anchor bolts or alternate anchorage calculated to resist the tension load for your specific application. 
  • Use steel nylon locking nuts or thread adhesive to minimize the chance of nut spin. Anchor bolt washer is not required.
  • For the screwed holdowns, secure the CD holdown to the steel framing member by filling all the pre-punched holes with #14 self-tapping screws to achieve listed capacities.
  • For the bolted holdowns, secure the CD holdown to the steel framing member with 3/4" and 1/2" diameter bolts in the pre-punched holes per the design load table to achieve listed capacities.  Field drill holes in the framing member as required to accommodate the required bolts.
  • Boundary members (back-to-back studs) shall be designed by a qualified professional. To tie back-to-back stud members together, the Designer must determine the fasteners required to bind members to act as one unit.
  • CD holdowns can be welded per Designer's recommendation and specification.
  • Welding procedures shall be qualified as specified in AWS D1.3.
  • Welded connections used for cold-formed steel structural members in which the thickness of the thinnest connected part is 0.18 inch or less shall comply to AISI S100-2016 w/ S2-20 specification Section J2.

Reference section R603.9.4.2 of the International Residential Code (IRC) for holdown requirements in residential applications. Consult the engineer of record for commercial applications.

Code Approvals & Performance Standards

  • AISI S100-16 (2020) w/S2-20 North American Specification for the Design of Cold-Formed Steel Structural Members
  • ASTM A36 Standard Specification for Carbon Structural Steel
  • ASTM A1011 Standard Specification for Structural Steel
  • IRC R603.9.4.2 Reference section of the International Residential Code (IRC) for holdown requirements in residential applications. Consult the engineer of record for commercial applications.
 

PRoduct submittal SHeets

Click the below Product Code to view Submittal/Tech Datasheet.

Product codeDescription
CD8-SClarkDietrich Holdown with Screwed Connection
CD10-S
CD15-S
CD8-BClarkDietrich Holdown with Bolted Connection
CD10-B
CD15-B

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