LSTHD Light Strap-Tie Holdown
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Holdowns and Tension Ties
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Product Details
The LSTHD is an embedded strap-tie holdown with features that aid correct installation and improve performance in both wood and cold-formed steel construction. When installed on the forms with the StrapMate® strap holder or other holding device, the unique design of this light cast-in-place strap-tie holdown delivers enhanced stability before and during the pour to help prevent both parallel and perpendicular movement
Key Features
- The fastener pattern helps to minimize splitting and allows for fastening to the edges of back-to-back studs
- The slots below the embedment line enable increased front-to-back concrete bond and help to reduce spalling
- Rim joists models accommodate up to 17” clear span without any loss of strap fastening
Material
- 14 gauge
Finish
- Galvanized
Installation
- Use all specified fasteners; see General Notes.
- Use tables for both standard concrete and post-tension slab installations.
- Install before concrete pour with a StrapMate, or other holding device.
- Fasten strap from the bottom up. Install strap plumb.
- Strap may be bent one full cycle (bent horizontal 90° then bent vertical) to aid wall placement, but may cause spalling behind the strap. If the spall is 1" or less, measured from the embedment line to the bottom of the spall, full loads apply. 1" to 4" spalls for LSTHD8 achieve 0.9 times table loads. Any portion of the strap left exposed should be protected against corrosion.
- Other than where noted in the two-pour detail, do not install where: (a) a horizontal cold joint exists within the embedment depth between the slab and foundation wall or footing beneath, unless provisions are made to transfer the load, or the slab is designed to resist the load imposed by the anchor; or (b) slabs are poured over concrete block foundation walls.
- Additional studs attached to the shearwall studs or post may be required by the designer for wall sheathing fastening.
- For installations in severe corrosion environments, refer to General Corrosion Risks for additional considerations.
- See installation illustrations in the image gallery for rebar information.
Related Literature
Product Information Table
| Model No. | Ga. | W (in.) | L (in.) | Coating/Material | Packaging Qty. |
|---|---|---|---|---|---|
| LSTHD8 | 14 | 3 | 18 5/8 | Zinc Galvanized, G90 | 1 |
| LSTHD8RJ | 14 | 3 | 32 1/8 | Zinc Galvanized, G90 | 1 |
Load Tables
Allowable Stress Design (ASD) Loads for LSTHD Strap Style Holdowns on CFS — 2,500 psi Concrete
| Min. Stem Wall (in.) | Model No. | Strap Length (L) | le (in.) | Non-Cracked | Cracked | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Standard | Rim Joist | Standard (in.) | Rim Joist (in.) | Req'd Screws | Midwall | Corner | Endwall | Req'd Screws | Midwall | Corner | Endwall | ||
| 6 | LSTHD8 | LSTHD8RJ | 18 5/8 | 32 1/8 | 8 | 20 -#10 | 2,985 | 2,590 | 1,620 | 16 -#10 | 2,565 | 2,225 | 1,395 |
| 8 | LSTHD8 | LSTHD8RJ | 18 5/8 | 32 1/8 | 8 | 20 -#10 | 2,985 | 2,590 | 2,135 | 16 -#10 | 2,565 | 2,225 | 1,835 |
| Min. Stem Wall (in.) | Model No. | Strap Length (L) | le (in.) | Non-Cracked | Cracked | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Standard | Rim Joist | Standard (in.) | Rim Joist (in.) | Req'd Screws | Midwall | Corner | Endwall | Req'd Screws | Midwall | Corner | Endwall | ||
|
|||||||||||||
| 6 | LSTHD8 | LSTHD8RJ | 18 5/8 | 32 1/8 | 8 | 16 -#10 | 2,270 | 2,090 | 1,220 | 14 -#10 | 2,250 | 1,950 | 1,220 |
| 8 | LSTHD8 | LSTHD8RJ | 18 5/8 | 32 1/8 | 8 | 16 -#10 | 2,615 | 2,125 | 1,635 | 14 -#10 | 2,250 | 1,950 | 1,610 |
Code Reports & Compliance
Drawings
| DWG | DXF | RFA | IFC | SAT | |||
|---|---|---|---|---|---|---|---|
