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 Sentence (3), 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 have even and level bearing and shall have not less than 150 mm length of bearing at end supports. (5) Steel angle lintels supporting masonry shall be prime painted or otherwise protected from corrosion. 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)  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


No Floor Load

None

3 650

7 300

10 950

14 600

18 250

21 900


1 200 mm 

L-90 x 90

L-125 x 90

203

L-90

L-90

L-90

L-100

L-125

L-125

L-125


 

x 90

x 90

x 90

x 90

x 90

x 90

x 90


 

x 6

x 6

x 8

x 8

x 8

x 10

x 13


305

2Ls-90

2Ls-90

2Ls-90

2Ls-90

2Ls-90

2Ls-100

2Ls-100


or less

6

8

 

x 90

x 90

x 90

x 90

x 90

x 90

x 90


 

 

 

 

x 8

x 8

x 8

x 8

x 8

x 8

x 8


1 500 mm

L-90 x 90

L-125 x 90

203

L-90

L-90

L-125

L-125

L-125

L-150

—


 

x 90

x 90

x 90

x 90

x 90

x 90

—


 

x 8

x 8

x 8

x 10

x 13

x 10

—


305

2Ls-90

2Ls-90

2Ls-90

2Ls-125

2Ls-125

2Ls-125

2Ls-125


 

8

8

 

x 90

x 90

x 90

x 90

x 90

x 90

x 90


 

 

 

 

x 8

x 8

x 8

x 8

x 8

x 8

x 10


1 800 mm

L-100 x 90

L-125 x 125

203

L-100

L-125

L-125

L-150

 

 

 


 

x 90

x 90

x 90

x 100

 

 

 


 

x 8

x 8

x 8

x 10

 

 

 


305

2Ls-100

2Ls-100

2Ls-125

2Ls-125

2Ls-125

2Ls-150

2Ls-150


 

8

8

 

x 90

x 90

x 90

x 90

x 90

x 100

x 100


 

 

 

 

x 8

x 8

x 8

x 8

x 10

x 10

x 10


2 100 mm

L-100 x 90

L-125 x 125

203

L-100

L-125

L-150

 

 

 

 


 

x 90

x 90

x 100

 

 

 

 


 

x 8

x 10

x 10

 

 

 

 


305

2Ls-100

2Ls-125

2Ls-125

2Ls-150

2Ls-150

 

 


 

8

8

 

x 90

x 90

x 90

x 100

x 100

 

 


 

 

 

 

x 8

x 10

x 10

x 10

x 10

 

 


2 400 mm

L-125 x 90

L-125 x 125

203

L-125

L-150

 

 

 

 

 


 

x 90

x 100

 

 

 

 

 


 

x 8

x 10

 

 

 

 

 


305

2Ls-125

2Ls-125

2Ls-150

 

 

 

 


 

8

8

 

x 90

x 90

x 100

 

 

 

 


 

 

 

 

x 8

x 13

x 10

 

 

 

 


2 700 mm

L-125 x 90

L-125 x 125

203

L-125

 

 

 

 

 

 


 

x 90

 

 

 

 

 

 


 

x 10

 

 

 

 

 

 


305

2Ls-125

2Ls-150

 

 

 

 

 


 

10

10

 

x 150

x 100

 

 

 

 

 


 

 

 

 

x 10

x 10

 

 

 

 

 


3 000 mm

L-150

L-125 x 125

203

L-150

 

 

 

 

 

 


 

x 100

 

 

 

 

 

 


 

x 10

 

 

 

 

 

 


305

2Ls-150

 

 

 

 

 

 


 

100 x 10

13

 

x 100

 

 

 

 

 

 


 

 

 

 

x 10

 

 

 

 

 

 


Column 1

2

3

4

5

6

7

8

9

10

11 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)  Minimum Angle Size, mm

70 mm Brick

90 mm Brick

100 mm Stone


Vertical Leg

Horizontal Leg

Thickness


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


Column 1

2

3

4

5

6 9.20.6.Thickness and Height