SECURE AND HOLD DOWN structural steel endposts between floors or TO THE FOUNDATION
ClarkDietrich HDP holdown plates provide cost-effective shearwall attachment and are used to transfer tension loads between floors or from structural members to the foundation embed plate (by others).
ClarkDietrich HDP holdown plates are designed for taller construction and higher tension loads; transferring the tension loads between floors or from structural members to the foundation embed plate (by others). The HDP holdown plates are pre-punched and available in six sizes that can be bolted or welded. They can be used for panelized construction or stick-built construction.
Material: A36 for 1/4" and 3/8" plate; A572 Gr50 for 1/2" plate
Bolt hole size: 13/16"
Product Data & Ordering Information
| 3" Wide Holdowns | |||||
|---|---|---|---|---|---|
| Product code | Thickness | Width | Length | Holes per End | Packaging |
| 300HDP025 | 1/4" | 3" | 24" | 2 | 250 |
| 300HDP038 | 3/8" | 3" | 24" | 3 | 200 |
| 300HDP050 | 1/2" | 3" | 30" | 4 | 100 |
Product Data & Ordering Information
| 5" Wide Holdowns | |||||
|---|---|---|---|---|---|
| Product code | Thickness | Width | Length | Holes per End | Packaging |
| 500HDP025 | 1/4" | 5" | 24" | 3 | 150 |
| 500HDP038 | 3/8" | 5" | 24" | 4 | 100 |
| 500HDP050 | 1/2" | 5" | 30" | 6 | 50 |
Load Tables
Holdown Plate capacities in compliance with AISI S100 and AISC 360. Components are intended for heavy loads and multi-story construction. A PE licensed engineer shall be the designer in responsible charge when including these holdowns.
Installation
- Field trimming, welding or drilling will be required when installing holdown plates. When trimming cold-formed steel, use a grinder or plasma cutter. No torch cutting.
- Clean all trimmed, cut, drilled and welded areas and paint with a zinc-rich (cold galvanize) paint.
- Endpost must align from level to level and holdown plates set flat on the post components before welding or bolting.
- Holdown plates are intended for tension loads and not tested for compression loads. Endposts with bearing gaps must have a structural shim installed for full compression load path.
- CD holdown plates can be welded or bolted, but a designer of record shall check the endpost connection capacity and provide a specific connection detail for each project.
- Welding to cold-formed steel endpost members shall be with 97 mil (50Ksi) minimum with a maximum weld size of 1/8" fillet. Welder shall be certified for sheet steel welding.
Code Approvals & Performance Standards
- 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 code | Description |
|---|---|
| 300HDP025 | 1/4" x 3" x 24" ClarkDietrich Holdown Plate |
| 300HDP038 | 3/8" x 3" x 24" ClarkDietrich Holdown Plate |
| 300HDP050 | 1/2" x 3" x 30" ClarkDietrich Holdown Plate |
| 500HDP025 | 1/4" x 5" x 24" ClarkDietrich Holdown Plate |
| 500HDP038 | 3/8" x 5" x 24" ClarkDietrich Holdown Plate |
| 500HDP050 | 1/2" x 5" x 30" ClarkDietrich Holdown Plate |
ClarkDietrich SubmittalPro®
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- Contact ClarkDietrich Technical Services at 888-437-3244 for any questions about creating product submittals or using SubmittalPro.