9.20.17. Above-Ground Flat Insulating Concrete Form Walls — OBC 2006 (in force 31 December 2006 to 1 January 2014)

9.20.17. — Above-Ground Flat Insulating Concrete Form Walls

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9.20.17.1. — Thickness of Flat Insulating Concrete Form Walls

(1) The thickness of concrete in flat insulating concrete form walls not in contact with the ground shall be,

(a) not less than 140 mm, and

(b) constant for the entire height of the wall.

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9.20.17.2. — Reinforcement for Flat Insulating Concrete Form Walls

(1) Horizontal reinforcement in above-grade flat insulating concrete form walls shall,

(a) consist of,

(i) one 10M bar placed not more than 300 mm from the top of the wall, and

(ii) 10M bars spaced not more than 600 mm o.c., and

(b) be placed in the middle third of the wall section.

(2) Vertical reinforcement in above-grade flat insulating concrete form walls shall,

(a) consist of 10M bars spaced not more than 400 mm o.c., and

(b) be placed in the middle third of the wall section.

(3) Vertical reinforcement required in Sentence (2) and interrupted by wall openings shall be placed not more than 600 mm from each side of the opening.

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9.20.17.3. — Openings in Flat Non-Loadbearing Insulating Concrete Form Walls

(1) No openings shall occur within 1 200 mm of interior and exterior corners of exterior non-loadbearing flat insulating concrete form walls.

(2) Portions of walls over openings in non-loadbearing flat insulating concrete form walls shall have a minimum depth of concrete of not less than 200 mm over the width of the opening.

(3) Openings more than 600 mm but not more than 3 000 mm in width in non-loadbearing flat insulating concrete form walls shall be reinforced at the top and bottom with one 10M bar.

(4) Openings more than 3 000 mm in width in non-loadbearing flat insulating concrete form walls shall be reinforced on all four sides with two 10M bar.

(5) Reinforcing bars described in Sentences (3) and (4) shall extend not less than 600 mm beyond the edges of the opening.

(6) The cumulative width of openings in non-loadbearing flat insulating concrete form walls shall be not more than 70% of the length of any wall.

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9.20.17.4. — Lintels over Openings in Loadbearing Flat Insulating Concrete Form Walls

(1) In loadbearing flat insulating concrete form walls, lintels shall be provided over all openings wider than 900 mm.

(2) Lintels described in Sentence (1) shall be constructed in accordance with Tables A-17, A-18 or A-19.

(3) Lintels described in Sentence (1) over openings wider than 1 200 mm shall be reinforced for shear with 10M stirrups at a maximum spacing of half the distance from the bottom reinforcing bar to the top of the lintel.

Editor's note

In the notes to Table-A-17, Table-A-18, Table-A-19, the footnote reference numbers differ only in presentation (superscript/inline rendering and separator spacing) from the e-Laws consolidation. The footnote text is identical.

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Table A-17 Maximum Allowable Clear Spans for Lintels in Flat Loadbearing Insulating Concrete Form (ICF) Walls(1)(2)(3) (1-10M Bottom Bar) Forming Part of Sentence 9.20.17.4.(1)


Column 1	Column 2	Column 3	Column 4	Column 5	Column 6
Minimum Lintel Thickness, mm	Minimum Lintel Depth, mm	Maximum Clear Span, m
		Supporting Light-Frame Roof Only		Supporting ICF Second Storey and Light-Frame Roof
		Maximum Ground Snow Load, kN/m²
		1.50	3.33	1.50	3.33
140	200	1.41	1.18	1.03	0.93
	300	1.78	1.50	1.30	1.18
	400	2.08	1.75	1.53	1.38
	500	2.33	1.97	1.72	1.56
	600	2.55	2.16	1.89	1.71
150	200	1.41	1.18	1.02	0.92
	300	1.78	1.50	1.29	1.17
	400	2.08	1.75	1.51	1.37
	500	2.33	1.97	1.70	1.54
	600	2.54	2.15	1.87	1.70
160	200	1.41	1.18	1.01	0.91
	300	1.78	1.50	1.28	1.16
	400	2.07	1.75	1.50	1.36
	500	2.32	1.96	1.68	1.53
	600	2.53	2.15	1.85	1.68
190	200	1.41	1.19	0.98	0.89
	300	1.78	1.50	1.24	1.13
	400	2.06	1.74	1.45	1.32
	500	2.30	1.95	1.63	1.49
	600	2.51	2.13	1.78	1.63
200	200	1.41	1.19	0.97	0.89
	300	1.77	1.49	1.23	1.12
	400	2.06	1.74	1.43	1.31
	500	2.30	1.95	1.61	1.48
	600	2.50	2.13	1.77	1.62
240	200	1.41	1.19	0.94	0.86
	300	1.76	1.49	1.18	1.09
	400	2.04	1.73	1.38	1.27
	500	2.27	1.93	1.55	1.43
	600	2.47	2.11	1.70	1.56

Notes to Table A-17:

⁽¹⁾ Deflection criteria is L/240, where “L” is the clear span of the lintel.

⁽²⁾ Linear interpolation is permitted between ground snow loads and between lintel depths.

⁽³⁾ 10M stirrups are required at a maximum d/2 spacing for spans greater than 1 200 mm, where “d” is the distance from the top of the lintel to the level of the bottom reinforcing bar in the lintel.

Table A-18 Maximum Allowable Clear Spans for Lintels in Flat Loadbearing Insulating Concrete Form (ICF) Walls(1)(2)(3) (1-15M Bottom Bar) Forming Part of Sentence 9.20.17.4.(2)


Column 1	Column 2	Column 3	Column 4	Column 5	Column 6
Minimum Lintel Thickness, mm	Minimum Lintel Depth, mm	Maximum Clear Span, m
		Supporting Light-Frame Roof Only		Supporting ICF Second Storey and Light-Frame Roof
		Maximum Ground Snow Load, kN/m²
		1.50	3.33	1.50	3.33
140	200	1.63	1.46	1.31	1.23
	300	2.43	2.08	1.81	1.64
	400	2.90	2.44	2.13	1.93
	500	3.26	2.75	2.41	2.18
	600	3.58	3.03	2.65	2.40
150	200	1.67	1.49	1.33	1.25
	300	2.48	2.08	1.79	1.62
	400	2.90	2.44	2.11	1.91
	500	3.26	2.75	2.38	2.16
	600	3.57	3.02	2.62	2.38
160	200	1.70	1.53	1.35	1.26
	300	2.48	2.08	1.78	1.61
	400	2.90	2.44	2.09	1.90
	500	3.25	2.75	2.36	2.14
	600	3.56	3.02	2.59	2.36
190	200	1.80	1.61	1.36	1.24
	300	2.48	2.09	1.73	1.58
	400	2.89	2.44	2.03	1.85
	500	3.23	2.74	2.29	2.09
	600	3.53	3.00	2.51	2.30
200	200	1.83	1.64	1.35	1.23
	300	2.48	2.09	1.71	1.57
	400	2.88	2.44	2.01	1.84
	500	3.22	2.74	2.26	2.07
	600	3.52	2.99	2.48	2.28
240	200	1.93	1.65	1.30	1.20
	300	2.47	2.08	1.66	1.52
	400	2.86	2.43	2.94	1.78
	500	3.19	2.72	2.18	2.01
	600	3.47	2.97	2.39	2.20

Notes to Table A-18:

⁽¹⁾ Deflection criteria is L/240, where “L” is the clear span of the lintel.

⁽²⁾ Linear interpolation is permitted between ground snow loads and between lintel depths.

⁽³⁾ 10M stirrups are required at a maximum d/2 spacing for spans greater than 1 200 mm, where “d” is the distance from the top of the lintel to the level of the bottom reinforcing bar in the lintel.

Table A-19 Maximum Allowable Clear Spans for Lintels in Flat Loadbearing Insulating Concrete Form (ICF) Walls(1)(2)(3) (2-15M Bottom Bar) Forming Part of Sentence 9.20.17.4.(2)


Column 1	Column 2	Column 3	Column 4	Column 5	Column 6
Minimum Lintel Thickness, mm	Minimum Lintel Depth, mm	Maximum Clear Span, m
		Supporting Light-Frame Roof Only		Supporting ICF Second Storey and Light-Frame Roof
		Maximum Ground Snow Load, kN/m²
		1.50	3.33	1.50	3.33
140	200	1.63	1.46	1.31	1.23
	300	2.43	2.18	1.96	1.84
	400	3.22	2.90	2.60	2.42
	500	4.00	3.60	3.25	2.70
	600	4.71	4.20	3.61	2.97
150	200	1.67	1.49	1.33	1.25
	300	2.48	2.23	1.99	1.87
	400	3.29	2.96	2.64	2.45
	500	4.80	3.68	3.29	2.74
	600	4.87	4.20	3.64	3.02
160	200	1.70	1.53	1.35	1.27
	300	2.53	2.28	2.02	1.90
	400	3.36	3.02	2.68	2.48
	500	4.16	3.76	3.27	2.78
	600	4.95	4.20	3.61	3.08
190	200	1.80	1.61	1.39	1.32
	300	2.67	2.40	2.09	1.97
	400	3.53	3.19	2.77	2.56
	500	4.38	3.81	3.18	2.90
	600	4.92	4.19	3.50	3.21
200	200	1.83	1.64	1.41	1.33
	300	2.87	2.44	2.11	2.00
	400	3.78	3.24	2.79	2.55
	500	4.46	3.81	3.15	2.89
	600	4.86	4.18	3.47	3.18
240	200	2.07	1.74	1.46	1.38
	300	3.07	2.59	2.18	2.07
	400	3.95	3.38	2.70	2.48
	500	4.40	3.80	3.04	2.80
	600	4.78	4.16	3.34	3.08

Notes to Table A-19:

(1) Deflection criteria is L/240, where “L” is the clear span of the lintel.

(2) Linear interpolation is permitted between ground snow loads and between lintel depths.

(3) 10M stirrups are required at a maximum d/2 spacing for spans greater than 1 200 mm, where “d” is the distance from the top of the lintel to the level of the bottom reinforcing bar in the lintel.

9.20.17.5. — Framing Supported on Flat Insulating Concrete Form Walls

(1) Floor joists supported on the side of flat insulating concrete form walls shall be supported with joist hangers secured to wood ledger boards.

(2) The ledger boards described in Sentence (1) shall be not less than,

(a) 38 mm thick, and

(b) the depth of the floor joists.

(3) Anchor bolts shall be used to secure ledger boards to insulating concrete form walls and shall be,

(a) embedded in the wall to a depth not less than 100 mm, and

(b) spaced in accordance with Table 9.20.17.5.

(4) Floor joists and building frames supported on top of flat insulating concrete form walls shall be anchored in conformance with Article 9.23.6.1.

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Table 9.20.17.5. Maximum Anchor Bolt Spacing for the Connection of Ledger Boards to Flat Insulating Concrete Form Walls Forming Part of Sentence 9.20.17.5.(3)


Column 1	Column 2	Column 3
Maximum Clear Floor Span, m	Maximum Anchor Bolt Spacing, mm
Maximum Clear Floor Span, m	Staggered 12.7 mm Diameter Anchor Bolts	Staggered 16 mm Diameter Anchor Bolts
2.44	450	500
3.00	400	450
4.00	300	400
5.00	275	325

9.20.17.6. — Anchoring of Roof Framing to Top of Flat Insulating Concrete Form Walls

(1) Roof framing supported on the top of flat insulating concrete form walls shall be fixed to the top plates, which shall be anchored to the wall with anchor bolts,

(a) not less than 12.7 mm in diameter, and

(b) spaced not more than 1 200 mm o.c.

(2) The anchor bolts described in Sentence (1) shall be placed in the centre of the insulating concrete form wall and shall be embedded not less than 100 mm into the concrete.

(3) Attachment of roof framing to wood top plates shall be in accordance with Table 9.23.3.4.

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9.20.17.7. — Protection from Precipitation and Damage

(1) Above ground flat insulating concrete form walls shall be protected from precipitation and damage in conformance with Section 9.27.

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9.20.17.

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