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Foundation Footings and Frost Protection

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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?

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

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

Encase them with concrete (B) Signup and view all the answers

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

400 mm (16 in.) (B) Signup and view all the answers

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

600 mm (24 in.) (A) Signup and view all the answers

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

150 mm (6 in.) (B) Signup and view all the answers

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

Use special footings (D) Signup and view all the answers

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

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