Cross Support For Floor Joist

Recommended beam joist spans for deck framing.

Cross support for floor joist.

Solid blocking should be used where floor joists overlap over beams. 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 decks use 16 on center spacing for joists. It should be placed at eight foot intervals between any floor joists 2x10 or longer.

You can use cross bracing instead. 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. 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. A joist support is the horizontal beam that supports the floor joists.

In some cases additional joist supports will have to be installed before there can be extra heavy objects on the floor. 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. 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. The joist support helps reinforce the floor so it can handle the weight load it needs to.