9.20.5. Masonry Support — OBC 2006 (in force 31 December 2006 to 1 January 2014)

9.20.5. — Masonry Support

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9.20.5.1. — Masonry Support

(1) All masonry shall be supported on masonry, concrete or steel, except that masonry veneer walls are permitted to be supported on foundations of wood frame constructed in conformance with Sentence 9.15.2.4.(1).

(2) Every masonry wall shall be at least as thick as the wall it supports, except as otherwise permitted in Article 9.20.12.2.

Text · e-Laws consolidated snapshot

9.20.5.2. — Lintels or Arches

(1) Masonry over openings shall be supported by steel, reinforced concrete lintels or masonry arches designed to support the imposed loads.

(2) Except as permitted in Sentences (3) and (6), steel angle lintels supporting masonry above openings shall conform to Table 9.20.5.2.A.

(3) Steel angle lintels supporting masonry veneer above openings shall conform to Table 9.20.5.2.B.

(4) Steel lintels described in Sentences (2) and (3) shall,

(a) have even and level bearing and shall have not less than 150 mm length of bearing at end supports, and

(b) bear on masonry, concrete or steel.

(5) Steel angle lintels supporting masonry shall be primed or painted or otherwise protected from corrosion.

(6) Steel beams supporting masonry veneer and wood stud walls above openings shall conform to Table 9.20.5.2.C.

(7) Steel beams described in Sentence (6) shall be supported at each end by a steel column, and have a minimum 6 mm plate welded to the flange to support the masonry veneer.

Notes toTable 9.20.5.2.C.:

(1) These spans assume that the beam supports the veneer, a wood stud wall and a maximum specified roof live load of 2.3 kN/m.

(2) Where the steel beam carries floor loads or larger roof loads, refer to Article 9.23.4.3.v1

Editor's note

This map follows the as-filed text of O. Reg. 350/06, whose notes to Table 9.20.5.2.c. read '(1) these spans ...' (with a space after the note number) and whose steel-angle dimensions use the letter 'x' (e.g. '82 x 250'). The e-Laws consolidation editorially renders these as '(1)these' (no space) and with the multiplication sign '×'; no amending regulation makes these changes.

Text · e-Laws consolidated snapshot

Table 9.20.5.2.A. Loose Steel Lintels for Masonry – No. & Size of Angles Required(7) Forming Part of Sentence 9.20.5.2.(2)

Column 1

Column 2

Column 3

Column 4

Col. 5

Col. 6

Col. 7

Col. 8

Col. 9

Col. 10

Col. 11

Clear Span⁽¹⁾⁽³⁾

Exterior Angles

Wall Thickness,mm

Interior Angles

for Brick

for Stone

Maximum Floor Loads per Metre of Span in Newtons^(2)(4)(5)

100 mm

100 mm + 50 mm stone facing

None

3 650

7 300

10 950

14 600

18 250

21 900

No Floor Load

1 200 mm or less

L-90 × 90 × 6

L-125 × 90 × 8

203

L-90

L-100

L-125

x 90

x6

x8

x10

x13

305

2Ls-90

2Ls-100

x 90

x 8

1 500 mm

L-90 × 90 × 8

L-125 × 90 × 8

203

L-90

L-125

L-150

—

x 90

—

x8

x10

x13

x10

—

305

2Ls-90

2Ls-125

x 90

x 8

x 10

1 800 mm

L-100 × 90 × 8

L-125 × 125 × 8

203

L-100

L-125

L-150

x 90

x 100

x 8

x 10

305

2Ls-100

2Ls-125

2Ls-150

x 90

x 100

x 8

x 10

2 100 mm

L-100 × 90 × 8

L-125 × 125 × 8

203

L-100

L-125

L-150

x 90

x 100

x 8

x 10

305

2Ls-100

2Ls-125

2Ls-150

x 90

x 100

x 8

x 10

2 400 mm

L-125 × 90 × 8

L-125 × 125 × 8

203

L-125

L-150

x 90

x 100

x 8

x 10

305

2Ls-125

2Ls-150

x 90

x 100

x 8

x 13

x 10

2 700 mm

L-125 × 90 × 10

L-125 × 125 × 10

203

L-125

x 90

x 10

305

2Ls-125

2Ls-150

x 150

x 100

x 10

3 000 mm

L-150 × 100 × 10

L-125 × 125 × 13

203

L-150

x 100

x 10

305

2Ls-150

x 100

x 10

Notes to Table 9.20.5.2.A.:

⁽¹⁾See Sentence 9.20.5.2.(4).

⁽²⁾Omit floor load in lintel when distance to bottom of floor construction is greater than width of opening.

⁽³⁾Interior and exterior angles in 200 mm walls and interior angles in 300 mm walls are bolted together when clear span is over 1 800 mm.

⁽⁴⁾When masonry lighter than brick is used over interior angles floor load may be increased by the difference in weight per square metre times the width of the opening. Not generally available.

⁽⁵⁾Interior angles have been designed for floor load plus brick masonry of height equal to width of opening.

⁽⁶⁾fs = 138 Mpa., Deflection maximum = 1/700 span.

⁽⁷⁾The figures in the Table indicating wall thickness and angle cross-section are in mm.

Table 9.20.5.2.B. Maximum Allowable Spans for Steel Lintels Supporting Masonry Veneer, m Forming Part of Sentence 9.20.5.2.(3)


Column 1	Column 2	Column 3	Column 4	Column 5	Column 6
Minimum Angle Size, mm			70 mm	90 mm	100 mm
Vertical Leg	Horizontal Leg	Thickness	Brick	Brick	Stone
90	75	6	2.55	—	—
90	90	6	2.59	2.47	2.30
100	90	6	2.79	2.66	2.48
125	90	8	3.47	3.31	3.08
125	90	10	3.64	3.48	3.24
125	90	13	3.82	3.59	3.33
150	90	10	4.06	3.82	3.54
150	90	13	4.32	4.07	3.77
150	100	13	4.37	4.12	3.82
180	100	10	4.57	4.30	3.99
180	100	13	4.87	4.59	4.25

Table 9.20.5.2.C. Maximum Allowable Spans for Steel Beams Supporting Masonry Veneer, m(1), (2) Forming Part of Sentence 9.20.5.2.(6)

Column 1	Column 2	Column 3	Column 4
Section	70 mm Brick	90 mm Brick	100 mm Stone
W 150 × 22	4.23	4.09	3.92
W 150 × 30	4.68	4.52	4.32
W 200 × 27	5.26	5.08	4.84
W 200 × 31	5.57	5.37	5.11
W 200 × 36	5.70	5.49	5.23

9.20.5.

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