Floor Joist Strapping And Bridging

To install the type shown here drive the toothed end into the joist and nail the other end.

Floor joist strapping and bridging. If 1x3 or 4 wood x bridging is properly installed as the joists shrink. In addition to preventing splaying of the joists properly installed x bridging will allow load sharing between the joists. Floor joist bridging is critical to the structural strength of a floor as shown in figure 1. Bridging between joists floor plans or specifications usually call for bridging between joists.

Strap bridging for bottom of floor joists used to prevent joist rotation and lateral movement. From both ends of the span. Various types of metal bridging are available at home centers and lumberyards. Bridging holds the joists in line and helps distribute the load carried by the floor unit.

The joists shown here for example span 12 ft so we added rows of bridging 4 ft. Figure 1 25 shows the lapped view a and butt view b methods of framing over girders. 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. Figure 1 25 joists supported by s beam using wooden blocks.

Yet it is not uncommon to find bridging not properly installed or missing all together. As joists shrink over time metal bridging loses it s tension and is useless for load sharing. Adding two rows of bridging costs a few dollars per joist. Properly installed wood x bridging tightens as the joists shrink to the degree that i ve seen the bottom of the joists get a slight crook in them from the bridging.

Proper bridging distributes the load on the floor to other joists and over time prevents floors from sagging and squeaking do to floor joists twisting and warping. The ontario building code strapping and bridging in tables a 1 and a 2 9 23 9 4. Block and strap bridging is installed to prevent joist rotation and lateral movement.