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NASCLA Commercial General Building Contractor — Practice Exam

Wood: practice questions

Our NASCLA Commercial GC bank has 13 questions on this topic. Here are 5 of them with answers; the full mock exam draws from every topic, like the real one.

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Question 1

Why should lumber be stored off the ground and covered on site?

  1. It doesn't matter for framing lumber, which is dried at the mill
  2. To increase its grade
  3. To keep it dry and limit warping, decay and dimensional change
  4. To make it easier to cut
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C. To keep it dry and limit warping, decay and dimensional change — Allow air to circulate under the cover.

Question 2

What does preservative treatment protect wood against?

  1. Shrinkage
  2. Fire, in every case, as well as decay and mold growth
  3. Splitting from nails
  4. Decay fungi and insects such as termites
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D. Decay fungi and insects such as termites — Fire-retardant treatment is a separate process.

Question 3

What is oriented strand board (OSB)?

  1. A panel made of wood strands in cross-oriented layers bonded with resin
  2. Solid lumber edge-glued
  3. A gypsum-based panel
  4. Plywood made of thin veneers glued with the grain at right angles
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A. A panel made of wood strands in cross-oriented layers bonded with resin — It's widely used for wall and roof sheathing.

Question 4

What is glued-laminated timber (glulam)?

  1. Solid sawn heavy timber
  2. Wood chips pressed into panels
  3. Plywood made of thin veneers, used as roof and wall sheathing
  4. Layers of dimension lumber bonded together into large structural members
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D. Layers of dimension lumber bonded together into large structural members — It allows large, long members with consistent properties.

Question 5

Why are prefabricated wood trusses braced during erection?

  1. To keep them dry
  2. To raise their load rating
  3. To hold insulation in place between the trusses during roofing
  4. They are unstable until permanently braced and can topple like dominoes
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D. They are unstable until permanently braced and can topple like dominoes — Follow the truss manufacturer's bracing guidance.

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