Floor Truss Blocking

Floor trusses offer four different bearing conditions for a wider variety of uses. 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. In the field float blocks under the edge of the remaining subfloor and screw them through the subfloor.

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These are the steps to take to install blocking.

Floor truss blocking.

Bottom chord bearing bottom chord bearing trimmable ends top chord bearing and mid block bearing are all available. When the 4x4 block length is extended this is referred to as mid chord bearing. Toenail them once that s done. The multiple bearing conditions make matching existing floor heights much easier when using floor trusses.

Measure the length between the two joists. Truss a pre built component that functions as a structural support member. Hammer your nails. 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. I joists offer only one bearing condition. The lumber should be the same depth as the joist. No these are not a substitute for blocking.

This allows you to find the distance in lumber you need to cut. Parallel chord roof trusses and energy heel trusses often exceed a 15 heel height and have need for this more elaborate method of blocking. For example if you have. Is the combination of roof sheathing gypsum wallboard on the ceiling and a hurricane clip on one side of a truss an acceptable substitution for solid blocking.

Blocks blocking panels and structural panels plywood osb are all acceptable. Along the wall at the top of your photo simply cut blocks that fit snugly between the trusses and toenail them in place.

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