Engineered i joists can span long distances to make a flat and solid subfloor.
Propet floor joist bracing or blocking.
Usually solid wood blocking or cross x wood blocking.
I was always under the impression that bridging was intended to reduce the unsupported length of the beam based on lateral torsional buckling not load distribution.
For the next cavity.
So where joists span 2 5 m or more and the joists are four or more times their thickness 190 45 mm or larger blocking is required at the mid span.
If the floor is not flat or level the bracing or blocking is not the culprit.
Place the lumber block between the two joists.
Blocking at the joist ends must be between the edge pair of joists and then at 1 8 m centres maximum see figure 1.
I ve always used a lift for upper floors though.
Ive done it both ways.
For me the solid blocking takes longer to install but i.
Building code requires the use of blocking for floor joists that exceed 2 inches in width by 12 inches in depth.
So one of the last things that need to be done before sheathing the deck is to fill in with blocking.
For other floor joists blocking is required along the line of each braced wall in the storey below.
Attached pic is ceiling joist not floor but show what i typically do.
This is contrary to my understanding of the purpose of bridging.
For ground floor joists blocking is generally required along the lines of subfloor horizontal support i e.
Making professional blocks to make the blocks i cut sections of i joist 1 inches smaller than the space between the joists.
In addition clause 7 1 2 3 requires blocking at the mid span for the stability of deeper joists.
The fewer holes any.
Usually i stick it in somewhere around mid span.
Floor joist bridging vs blocking i like laying 1 1 8 super flat easy to pound t g together dropping a 2x6 from a floor above doesn t put a hole in it.
R505 3 3 joist bracing and blocking joist bracing and blocking shall be in accordance with this section.
Nail the block in place with 16d nails on each side of the blocking.
R505 3 3 1 joist top flange bracing the top flanges of cold formed steel joists shall be laterally braced by the application of floor sheathing fastened to the joists in accordance with section r505 2 5 and table r505 3 1 2.
In addition to providing lateral support blocking helps transfer weight to adjacent joists so that the floor acts as a unified system.
Repeat this process every 24 to 36 inches down the joists.
It installs faster and it leaves an unobstucted bay for mechanicals to be run.
Tying the joists together with blocking makes the floor even stronger and stiffer.
