Foundation Footings and Frost Protection
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Questions and Answers

What is the minimum projection of footings beyond each side of the wall?

  • 75 mm
  • 150 mm
  • 100 mm (correct)
  • 50 mm

What is the purpose of forming a key on the top of the footings?

  • To act as a capillary break
  • To help the foundation wall resist earth pressure (correct)
  • To provide a flat surface for the foundation wall
  • To increase the load-bearing capacity of the soil

What material should be used to level the footing excavation if it is uneven and too deep in places?

  • Excavated material
  • Concrete
  • Polyethylene sheets
  • Compacted granular material (correct)

Why is it recommended to place a polyethylene sheet over the footing?

<p>To prevent moisture from entering the foundation wall (D)</p> Signup and view all the answers

What should be done to pipe trenches directly under wall footings?

<p>Encase them with concrete (B)</p> Signup and view all the answers

What is the recommended vertical distance between steps in footings on sand or gravel?

<p>400 mm (16 in.) (B)</p> Signup and view all the answers

What should be the minimum horizontal distance between steps in footings?

<p>600 mm (24 in.) (A)</p> Signup and view all the answers

What is the minimum thickness of the vertical connection between footings at the step?

<p>150 mm (6 in.) (B)</p> Signup and view all the answers

What is the recommended action for steep slopes where more than one step may be required?

<p>Use special footings (D)</p> Signup and view all the answers

What is the recommended placement of the bottom of each run level of the footing?

<p>On undisturbed soil or compacted granular fill (A)</p> Signup and view all the answers

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