Red Seal Carpenter Practice Exam

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Prepare for success in carpentry with the Red Seal Carpenter Practice Exam. Sharpen your skills, tackle challenging questions, and boost confidence for the Red Seal certification.

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What must be done to a dimensional lumber floor system to stiffen the joists?

Install continuous stiffeners to all joists at 600 mm (2') o/c.
Install vertical stiffeners to all joists at 600 mm (2") o/c.
Install 2x4 blocks between joists at1800 mm (6') o/c max.
Install cross-bridging between joists at 2100 mm (7') o/c max.

The correct answer is: Install cross-bridging between joists at 2100 mm (7') o/c max.

Cross-bridging should be installed between joists at 2100 mm (7') o/c max in order to stiffen the joists in a dimensional lumber floor system. This is because cross-bridging provides diagonal bracing between joists, preventing them from twisting or shifting. Options A and B may also provide some stiffness, but they are not as effective as cross-bridging. Option C, installing 2x4 blocks between joists, may actually add weight and cause additional sagging to the floor system. Therefore, option D is the best solution for stiffening joists.