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Carpenter Red Seal Exam Prep · Question

A carpenter is constructing a circular concrete pier form. Which material is most suitable for creating the curved shape and achieving a smooth finish?

Sonotube is a brand name for treated fiberboard tubes specifically designed as forms for concrete columns, posts, and piers. Its rigid, circular shape allows fo

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Question: A carpenter is constructing a circular concrete pier form. Which material is most suitable for creating the curved shape and achieving a smooth finish?

Answer options:

  • Plywood sheathing
  • Oriented Strand Board (OSB) ✅ Sonotube (or similar fibre tube forms)
  • Dimension lumber

Correct answer: Sonotube (or similar fibre tube forms)

Explanation: Sonotube is a brand name for treated fiberboard tubes specifically designed as forms for concrete columns, posts, and piers. Its rigid, circular shape allows for easy, smooth, curved concrete elements.

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