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Dimensions of "The Footing Tube" and the FTB30 Base Pier
Tube/Footing Diameter (d₁)	Dimensions (mm)
Tube/Footing Diameter (d₁)	d₀	d₁	d₂	d₃	d₄	d₅	h₀	h₁
152 mm (6 in.)	355	152	152	297	304	297	1 372	152
203 mm (8 in.)	609	203	203	356	558	499	1 591	216
254 mm to 305 mm (10 in. to 12 in.)	609	254	305	477	559	521	1 626	304
546 mm (21 in.) (FTB30)	856	546	762	n/a^{Footnote (1)}	n/a	n/a	229	n/a

Test Results for Allowable Bearing Pressures and Loads
Soil Description	Allowable Bearing Pressure^{Footnote (1)} ^{Footnote (2)} (kPa)	Allowable Loads
Soil Description		152-mm (6-in.) Footing Tube^{Footnote (3)} 0.078 m2 Base Area	203-mm (8-in.) Footing Tube^{Footnote (4)} 0.239 m2 Base Area	254-mm to 305-mm (10-in. to 12-in.) Footing Tube^{Footnote (5)} 0.239 m2 Base Area	FTB30 0.455 m² Base Area
Dense or compact sand or gravel	150	11.8 kN/tube	35.9 kN/tube	35.9 kN/tube	68.2 kN/tube
Loose sand or gravel	50	3.9 kN/tube	11.9 kN/tube	11.9 kN/tube	22.7 kN/tube
Dense or compact silt	100	7.8 kN/tube	23.9 kN/tube	23.9 kN/tube	45.5 kN/tube
Stiff clay	150	11.8 kN/tube	35.9 kN/tube	35.9 kN/tube	68.2 kN/tube
Firm clay	75	5.9 kN/tube	17.9 kN/tube	17.9 kN/tube	34.1 kN/tube
Soft clay	40	3.1 kN/tube	9.5 kN/tube	9.5 kN/tube	18.1 kN/tube
Till	200	15.7 kN/tube	47.9 kN/tube	47.9 kN/tube	91.0 kN/tube
Clay shale	300	23.6 kN/tube	71.8 kN/tube	71.8 kN/tube	136.5 kN/tube
Sound bedrock	500	39.4 kN/tube	119.8 kN/tube	119.8 kN/tube	227.5 kN/tube

Notes:

Footnote 1

Referenced in Table 9.4.4.1. of Division B of the NBC 2015.

Return to footnote 1 referrer

Footnote 2

Where a foundation bears on gravel, sand or silt, and the water table is within a distance below the bearing surface equal to the width of the foundation, the allowable bearing pressure shall be 50% of that determined in Article 9.4.4.1., Allowable Bearing Pressures, of Division B of the NBC 2015.

Return to footnote 2 referrer

Footnote 3

Not for use where frost depth exceeds 1.3 m.

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Footnote 4

Not for use where frost depth exceeds 1.4 m.

Return to footnote 4 referrer

Footnote 5

Not for use where frost depth

Return to footnote 5 referrer

Test Results for Stability
Tube	Requirement	Result^{Footnote (1)}
152 mm (6 in.)	Within 10 mm horizontally of original position	Pass
203 mm (8 in.)	Within 10 mm horizontally of original position	Pass
254 mm to 305 mm (10 in. to 12 in.)	Within 10 mm horizontally of original position	Pass
546 mm (21 in.) (FTB30)	Within 10 mm horizontally of original position	Pass

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