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Carpenter Red Seal Exam Prep · Question

A carpenter is working on a residential project requiring the installation of trusses. What is the typical spacing between standard roof trusses according to residential construction practices in Canada?

While 406 mm (16 inches) on centre is common for floor joists and sometimes walls, standard roof trusses are most commonly spaced at 600 mm (24 inches) on centr

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Question: A carpenter is working on a residential project requiring the installation of trusses. What is the typical spacing between standard roof trusses according to residential construction practices in Canada?

Answer options:

  • 400 mm on centre (o.c.)
  • 406 mm on centre (o.c.) ✅ 600 mm on centre (o.c.)
  • 610 mm on centre (o.c.)

Correct answer: 600 mm on centre (o.c.)

Explanation: While 406 mm (16 inches) on centre is common for floor joists and sometimes walls, standard roof trusses are most commonly spaced at 600 mm (24 inches) on centre in residential construction in Canada. This spacing is efficient for sheathing materials and generally meets structural requirements.

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