Cross Support For Floor Joist

Solid blocking should be used where floor joists overlap over beams.

Cross support for floor joist.

The bigger you make your deck the more you ask of the framing timbers that hold up the deck s structure and the joists and beams that support the. Most decking is not strong enough to support longer spans than 16. Figure 4 2 x 4 installed below duct work table 1 provides the correct quantity of bridging relative to the span of the floor joist. A joist support is the horizontal beam that supports the floor joists.

The layout term for joists is on center which is the center to center measurement from one joist to the next. It should be placed at eight foot intervals between any floor joists 2x10 or longer. You can use cross bracing instead. Although not as good as solid or cross bridging a 2 x 4 supporting the duct work as shown in figure 4 would provide more support and load sharing than a light piece of metal.

Providing more support and rigidity than cross bracing solid blocking is a reasonable alternative but can be an obstacle for running plumbing pipes and electrical wire between floor joists. Cross bracing or bridging is another system that reinforces a structure of a building just like blocking does. The joist support helps reinforce the floor so it can handle the weight load it needs to. The difference is that the cross bracing uses two pieces of support in a diagonal shape that creates an x between the joists instead of a solid block in blocking.