B3 61 Contractor Trade Practice Exam

What is the purpose of solid blocking in floor framing?

Increases vertical load capacity Provides lateral restraint of joist ends Acts as a moisture barrier Reduces heat transfer

Correct Answer:

Provides lateral restraint of joist ends

Explanation:

Solid blocking between floor joists mainly provides lateral restraint to the joist ends, tying the joists together so the floor behaves as a single, rigid unit. By filling the gaps between adjacent joists, blocking prevents the ends from twisting or spreading under load and helps transfer shear across the floor, reducing deflection and squeaks. It also gives a solid nailing surface and helps stabilize long-span floors. This isn’t about increasing vertical load capacity by itself, nor is it a moisture barrier or a primary way to cut heat transfer.

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