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STHD Strap-Tie Holdown

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Description

The STHD is an embedded strap-tie holdown offering high loads 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 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 allows for fasteners to the edges of back-to-back studs
  • Rim joists models accommodate up to 17” clear span without any loss of strap fastening
  • The slots below the embedment line enable increased front-to-back concrete bond and help to reduce spalling

Material

  • 12 gauge

Finish

  • Galvanized

Installation

  • See General Notes for Holdowns and Tension Ties.
  • 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. STHD10 and STHD14 achieve full load for spalls less than 4″. 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.

For Two-Pour Installation for Downturn Footings

  • For STHD10 installed through a 4″-thick slab, use the equivalent 8″ stem wall loads of the LSTHD8
  • For STHD14 installed through a 4″-thick slab, use the equivalent 8″ stem wall loads of the STHD10
  • For STHD14 installed through a 6″-thick slab, use the equivalent 8″ stem wall loads of the LSTHD8
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