Diagonal Tension Strapping

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.

Product Data & Ordering Information

Strap

Gauge (mils) Design Thickness Min. Width Max. Width Length Pcs./Skid
20 (33) .0346" 2" 12" 10' 200
18 (43) .0451" 2" 12" 10' 200
16 (54) .0566" 2" 12" 10' 200
14 (68) .0713" 2" 12" 10' 200
12 (97) .1017" 2" 12" 10' 200

20 and 18 gauge are 33,000 psi yield strength. 16, 14 and 12 gauge are 50,000 psi yield strength.

Coil

Gauge (mils) Design Thickness Min. Width Max. Width Pcs./Skid
20 (33) .0346 2" 12"

1 coil

18 (43) .0451 2" 12" 1 coil
16 (54) .0566 2" 12" 1 coil
14 (68) .0713 2" 12" 1 coil
12 (97) .1017 2" 12" 1 coil

20 and 18 gauge are 33,000 psi yield strength. 16, 14 and 12 gauge are 50,000 psi yield strength.