Floor trusses offer four different bearing conditions for a wider variety of uses.
Floor truss blocking.
I joists offer only one bearing condition.
These are the steps to take to install blocking.
Top chord bearinga floor truss support condition in which the truss load is transferred to the bearing or support through the top chord and 4x4 block end detail.
Blocks blocking panels and structural panels plywood osb are all acceptable.
This allows you to find the distance in lumber you need to cut.
Truss a pre built component that functions as a structural support member.
When the 4x4 block length is extended this is referred to as mid chord bearing.
Measure the length between the two joists.
Hammer your nails.
Toenail them once that s done.
Parallel chord roof trusses and energy heel trusses often exceed a 15 heel height and have need for this more elaborate method of blocking.
The multiple bearing conditions make matching existing floor heights much easier when using floor trusses.
The lumber should be the same depth as the joist.
No these are not a substitute for blocking.
Bottom chord bearing bottom chord bearing trimmable ends top chord bearing and mid block bearing are all available.
Cut the lumber to fit between the two joists.
A set of plans and specifications will often provide the lateral load the blocking must resist and specify that the truss supplier design the blocking to resist that load.
For example if you have.