Flat Strapping

Multipurpose flat stock used for bracing, bridging, backing or tension strapping

Flat Strapping is made in a variety of widths and thicknesses to meet different application requirements.

Applications Include:

  • Horizontal strap lateral bracing for wall studs
  • Strap bridging for bottom of floor joists
  • Strap backing plate for attachment of fixtures in walls
  • Tension strapping for shear wall x-bracing

Product Data & Ordering Information

Strapping is available in coil form or flat length of 10'

  • 10' long strapping widths available: 1" to 12”
  • Coil form strapping widths available: 1", 1-1/2",2",2-1/2" and 3"

Thicknesses: 18mil (25ga) - 97mil (12ga)

Not all strapping products are available in all markets. Please check with your local ClarkDietrich sales representative for availability in your area.

Coating & Yield Strength must be specified at the time of order

Coatings:

  • 18mil - 30mil = G40EQ (G40 or G60 available)
  • 33mil - 97mil = CP60 (G90 available)

Yield Strength:

  • 18mil - 30mil = 30ksi
  • 33mil - 97mil = 50ksi


Horizontal strap lateral bracing for wall studs

Commonly used bracing for wall studs deeper than 6"

Properly spaced horizontal steel bracing provides resistance to stud rotation and minor axis buckling under wind and axial loads. Block and strapping is typically used when wall studs exceed 6".  U-Channel or the Spazzer® bar does not provide sufficient bracing for members wider than 6". Both stud flanges must be attached to top and bottom runner flanges to provide proper end support. Floor and ceiling runners must also be anchored securely to the structure. To utilize the stud’s load carrying capacity fully, horizontal bracing must be installed at proper intervals.

Lateral bracing consists of a field-cut stud or track for solid blocking and steel strap bracing on both flanges of the studs. Solid blocking is placed at each end of the wall, adjacent to wall openings and 8' O.C. maximum. The blocking is attached to each adjacent stud via EasyClip™ E- or S- Series™ clips, or when a track is used, the flanges are cut, the web bent and a minimum 4" overlap is used to secure the track block to the studs. Strap bracing, 2" wide and 20-gauge (33 mil) minimum, is fastened to each solid block and stud flange.






Strap bridging for bottom of floor joists

Used to prevent joist rotation and lateral movement

Block and strap bridging is installed to prevent joist rotation and lateral movement. Solid blocking, a field-cut track or joist section, is welded or screw-attached between the first and last two outer joist bays and at a maximum of 8' O.C. along the strap, over all interior supports and adjacent to floor openings. Two-inch wide corrosion resistant strapping is also screw-attached or welded to the bottom of every joist flange. Lateral support on the top flanges is usually provided by sub floor or deck material.

Spacing of bridging must be calculated based on the required strength. In general, bridging is installed at a maximum of 8' O.C. spacing pendicular to the joists. For example, an 18' joist span would require two bridging runs at 6' O.C. spacing.

Where the sub-floor or decking does not provide lateral support, strap must also be installed on the top flange of the joist.

Install immediately after joists are erected and before construction loads are applied.
Solid blocking is field cut from track or joist sections.






Strap backing plate for attachment of fixtures in walls

Added support where shelves, cabinets, fixtures or handrails are installed

Strapping backing plate is a general multipurpose flat stock that is used for backer plate to support shelves, cabinets, fixtures or handrails when applied to metal framing.

Strapping backing plate is a general multipurpose flat stock that is used for backer plate to support shelves, cabinets, fixtures or handrails when applied to metal framing.
Use as backer plates for attachment of fixtures to metal stud walls.






Tension strapping for shear wall x-bracing

 

Bracing for load-bearing framing to resist racking under wind and seismic loads

 

Diagonal tension strapping and gusset plate components are used in combination to provide shearwall (racking restraint) for light-gauge load-bearing framing under wind and seismic loads. They are normally installed on both sides of the wall directly over framing members and are easily covered with facing materials. Straps are positioned diagonally from the bottom track to the top track. In order to resist load in each direction, an X-configuration should be used. At a minimum, double studs are positioned at ends of the X-brace to serve as compression studs.

Straps are either attached directly to the compression studs or are attached via Gusset Plates. Compression studs must be anchored to the foundation, normally with ClarkDietrich Holdowns. For multi-story construction, the uplift loads are extremely high. It is not uncommon to require 20,000 to 40,000 pounds of uplift force at these connections. Since ClarkDietrich Holdowns are not designed to resist this magnitude of force, it is recommended that embedded plates be installed prior to pouring the concrete foundation. A heavy steel assembly is then welded to the embedded plate and to the compression studs.

Caution: Racking loads are first transferred to the roof or floor decking and then to the shearwalls (X-bracing). The X-bracing then relies on a proper foundation to resist uplift and shear forces. In order for the system to function properly, the load path from the roof or floor deck to the shearwalls to the foundation must be complete. This normally requires additional bracing, blocking, track and rim splices, drag struts, uplift anchors and heavy-duty foundations.