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LSTHD/STHD Strap Tie Holdown

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The STHD is an embedded strap tie holdown with high load capacity and a staggered nail pattern to help minimize splitting. The latest version of the STHD strap tie holdowns incorporates many new features that improve installation and function. When used in conjunction with the StrapMate® you have a system that prevents both parallel and perpendicular movement during installation relative to the form. Allows for accurate location of the STHDs and reduces the possibility of spalling.

Features

Material: LSTHD8, LSTHD8RJ - 14 ga, all others - 12 ga.

Finish: Galvanized

Installation:


top Gallery:
  roll over images below to see larger image
 
 
STHD
U.S. Patent 5,813,182
Nails are countersunk for a low profile strap surface.  

Typical STHD Applications
(for two pour, see footnote 5.)

Typical STHD14RJ Rim Joist Application Typical STHD14 End Installation
(No corner return)
Single Pour Rebar Installation Two Pour Rebar Installation
*Maintain minimum rebar cover, per ACI-318 concrete code requirements.
top Spall Reduction System for STHD Strap Tie Holdown:
 
 
SM1
U.S. Patent 6,796,099
Features and Benefits
  • Built-in Tab:
    • Reduces spalling and costly retrofits.
    • No additional labor to install.
    • Holds STHD away from form board.
  • StrapMate Locator Line:
    • Easy inspection to ensure proper location.
    • Allows Adjustment without removing STHD.
  • Additional Diamond Hole in RJ versions:
    • One more fastener to help prevent the STHD RJ models from bowing out at the rim joist section.

top Tension Loads for STHD Installations:See code report listings below
Table
  1. 'RJ' after the model indicates STHDs for rim joist applications, e.g. STHD8RJ.
  2. STHD14RJ on 8" stemwall requires 30-16d sinkers, with the (le) load at 133% of 4960 lbs.
  3. 10d commons nails may be used with no load reduction.
  4. Minimum nail end distance to prevent splitting is 10 x diameter, 1 1/2" for 16d sinkers and 10d common.
  5. For two pour with 4" slab or less. The STHD14 load at 1/2" end distance 2000 psi is 3235 lbs. and 4220 lbs. at 14" end distance.
    The STHD10 at the same condition is 2035 lbs. for 1/2" end distance, and 2750 lbs. at 10" end distance.
  6. Allowable loads have been increased for earthquake or wind load durations with no further increase allowed; reduce
    where other load durations govern.
  7. Where fewer fasteners are used in the structural wood member, reduce loads according to the code.
  8. To get the full table load, the minimum center-to-center spacing is twice the embedment depth when resisting tension loads at the same time.
  9. There is an increase in the amount of deflection if the strap is installed on the outside of the shear panel instead of directly to the framing. Refer to technical bulletin T-PLYWOOD.
  10. Calculate loads using straight line interpolation for corner distances between 1/2" and le.
  11. STHD14 and STHD14RJ installed on HF/SPF in an 8" stemwall: the le load is 5280 lbs.
  12. Post design shall be by Designer.
  13. Loads shown apply to post tension slabs when one #4 rebar (minimum) is installed as in detail 1.
  14. Structural composite lumber columns have sides that show either the wide face or the edges of the lumber strands/veneers. Values in the tables reflect installation into the wide face.For concrete spalls between 1" and 4" the allowable loads is 0.90 of the table loads.
  15. For concrete spalls between 1" and 4" the allowable loads is 0.90 of the table loads.
  16. Table loads apply to stemwall applications provided there is a minimum end distance of le. See table for loads when installed less than le.
  17. NAILS: 16d sinker = 0.148" dia. x 3 1/4" long. See other nail sizes and information.
top Load Table:
Table
  1. Loads based on 2500 psi minimum concrete strength
  2. Allowable loads have been increased for earthquake or wind load durations with no further increase allowed; reduce where other load durations govern.
  3. For dimensional information and required fasteners, refer to table above.
  4. For STHD14 1 1/2" End Distance in 8" stemwalls, loads can be increased to 4200 lbs.
  5. Allowable loads also apply to rim joist models.

top Code Reports (PDFs):
Legacy Reports
  IAPMO ES ER ICC-ES ESR CITY OF LOS ANGELES STATE OF FLORIDA ICC-ES NER ICC-ES ER ICC-ES ES
LSTHDSee specific model numbers for code listings.
LSTHD8      FL503   ER-5349  
LSTHD8RJ      FL503   ER-5349  
STHDSee specific model numbers for code listings.
STHD10      FL503 / FL9601   ER-5275 / ER-5349  
STHD10RJ      FL503 / FL9601   ER-5349  
STHD14      FL503 / FL9601   ER-5275 / ER-5349  
STHD14RJ      FL503 / FL9601   ER-5349  
STHD8      FL503 / FL9601   ER-5275 / ER-5349  
STHD8RJ      FL503 / FL9601   ER-5349  

   
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