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OBC 2006 › Division B

9.37.3.1.

Version 1 — in force 1 January 2010

In force · amended
Verified · covered Verified against the 2010-01-01–2010-03-31 consolidation, whose range covers the query date. How to read this

Provenance

OBC 1997 · continues from 9.37.3.1. — Pro

Base · O. Reg. 350/06 · ext v0 →

O. Reg. 503/09, cl. 200 · ext ← current

In force 2010-01-01

OBC 2012 · continues as 9.37.3.1. — Pro

9.37.3.1. — Support Over Openings

(1) Logs placed in vertical position shall be supported over window and door openings by lintels meeting the requirements of Tables A-12 to A-16.

Text · e-Laws consolidated snapshot

Table A-12 Maximum Spans for Built-up Ridge Beams and Lintels Supporting the Roof and Ceiling Only – No. 1 or No. 2 Grade Forming Part of Sentences 9.23.4.2.(4), 9.23.12.3.(1) and 9.37.3.1.(1)

Column 1

Column 2

Column 3

Column 4

Column 5

Column 6

Column 7

Commercial Designation

Beam or Lintel Size, mm

Maximum Span, m(1)(2)(3)

Specified Snow Load, kPa

1.0

1.5

2.0

2.5

3.0

Douglas Fir – Larch (includes Douglas Fir and Western Larch)

3 – 38 × 184

2.65

2.28

2.03

1.85

1.71

4 – 38 × 184

3.06

2.64

2.35

2.14

1.97

5 – 38 × 184

3.43

2.95

2.62

2.39

2.21

3 – 38 × 235

3.25

2.79

2.49

2.26

2.09

4 – 38 × 235

3.75

3.22

2.87

2.61

2.41

5 – 38 × 235

4.19

3.60

3.21

2.92

2.70

3 – 38 × 286

3.77

3.24

2.88

2.62

2.43

4 – 38 × 286

4.35

3.74

3.33

3.03

2.80

5 – 38 × 286

4.86

4.18

3.72

3.39

3.13

Hem – Fir (includes Western Hemlock and Amabilis Fir)

3 – 38 × 184

2.78

2.39

2.13

1.94

1.79

4 – 38 × 184

3.21

2.76

2.46

2.24

2.07

5 – 38 × 184

3.59

3.09

2.75

2.50

2.31

3 – 38 × 235

3.40

2.93

2.61

2.37

2.19

4 – 38 × 235

3.93

3.38

3.01

2.74

2.53

5 – 38 × 235

4.39

3.78

3.36

3.06

2.83

3 – 38 × 286

3.95

3.40

3.02

2.75

2.54

4 – 38 × 286

4.56

3.92

3.49

3.18

2.94

5 – 38 × 286

5.10

4.38

3.90

3.55

3.28

Spruce – Pine – Fir (includes Spruce (all species except Coast Sitka Spruce) Jack Pine, Lodgepole Pine, Balsam Fir and Alpine Fir)

3 – 38 × 184

2.88

2.48

2.21

2.01

1.86

4 – 38 × 184

3.30

2.86

2.55

2.32

2.14

5 – 38 × 184

3.55

3.10

2.82

2.59

2.40

3 – 38 × 235

3.53

3.03

2.70

2.46

2.27

4 – 38 × 235

4.07

3.50

3.12

2.84

2.62

5 – 38 × 235

4.54

3.91

3.49

3.17

2.93

3 – 38 × 286

4.09

3.52

3.13

2.85

2.63

4 – 38 × 286

4.72

4.06

3.62

3.29

3.04

5 – 38 × 286

5.28

4.54

4.04

3.68

3.40

Notes to Table A-12:

(1)Beam and lintel spans are calculated based on a maximum supported length of 4.9 m. Spans may be increased by 5% for supported lengths of not more than 4.3 m, by 10% for supported lengths of not more than 3.7 m, and by 25% for supported lengths of not more than 2.4 m.

(2)For ridge beams, supported length means half the sum of the rafter, joist or truss spans on both sides of the beam. For lintels, supported length means half the sum of truss, roof joist or rafter spans supported by the lintel plus the length of the overhang beyond the lintel.

(3)Provide a minimum bearing length of 76 mm.

Table A-13 Maximum Spans for Douglas Fir – Larch Lintels – No. 1 or No. 2 Grade -Non-Structural Sheathing(1) Forming Part of Sentences 9.23.12.3.(1) and (3) and 9.37.3.1.(1)

Column 1

Column 2

Column 3

Column 4

Column 5

Column 6

Column 7

Column 8

Lintel Supporting

Lintel Size, mm(2)

Maximum Span, m(3)(4)

Exterior Walls

Interior Walls

Specified Snow Load, kPa

1.0

1.5

2.0

2.5

3.0

Limited attic storage and ceiling

2 – 38 × 89

This Area Intentionally Left Blank

1.25

2 – 38 × 140

1.78

2 – 38 × 184

2.17

2 – 38 × 235

2.65

2 – 38 × 286

3.08

Roof and ceiling only (tributary width of 0.6 m maximum)(5)

2 – 38 × 89

2.68

2.34

2.13

1.97

1.86

1.97

2 – 38 × 140

4.21

3.68

3.34

3.10

2.92

3.10

2 – 38 × 184

5.50

4.84

4.39

4.08

3.84

4.08

2 – 38 × 235

6.61

5.97

5.56

5.21

4.88

5.21

2 – 38 × 286

7.66

6.92

6.44

6.09

5.66

6.09

Roof and ceiling only (tributary width of 4.9 m maximum)(6)

2 – 38 × 89

1.25

1.07

0.96

0.87

0.80

0.87

2 – 38 × 140

1.78

1.53

1.36

1.24

1.15

1.24

2 – 38 × 184

2.17

1.86

1.66

1.51

1.40

1.51

2 – 38 × 235

2.65

2.28

2.03

1.85

1.71

1.85

2 – 38 × 286

3.08

2.64

2.35

2.14

1.98

2.14

Roof, ceiling and 1 storey(3)(6)(7)

2 – 38 × 89

0.96

0.88

0.82

0.77

0.73

0.68

2 – 38 × 140

1.37

1.26

1.17

1.10

1.04

0.97

2 – 38 × 184

1.67

1.53

1.42

1.34

1.26

1.18

2 – 38 × 235

2.04

1.88

1.74

1.63

1.54

1.44

2 – 38 × 286

2.37

2.18

2.02

1.90

1.79

1.67

Roof, ceiling and 2 storeys(3)(6)(7)

2 – 38 × 89

0.86

0.81

0.77

0.73

0.70

0.61

2 – 38 × 140

1.23

1.16

1.09

1.04

0.99

0.87

2 – 38 × 184

1.50

1.41

1.33

1.27

1.21

1.06

2 – 38 × 235

1.84

1.72

1.63

1.55

1.48

1.30

2 – 38 × 286

2.13

2.00

1.89

1.80

1.72

1.51

Roof, ceiling and 3 storeys(3)(6)(7)

2 – 38 × 89

0.81

0.77

0.73

0.71

0.68

0.57

2 – 38 × 140

1.15

1.10

1.05

1.01

0.97

0.82

2 – 38 × 184

1.40

1.33

1.28

1.22

1.18

1.00

2 – 38 × 235

1.71

1.63

1.56

1.50

1.44

1.22

2 – 38 × 286

1.99

1.89

1.81

1.74

1.67

1.41

Notes to Table A-13:

(1)Where structural sheathing is used, lintel spans may be increased by 15%. Structural sheathing consists of a minimum 9.5 mm thick structural panel conforming to CSA O121-M, CSA O151, CAN/CSA-O325.0 or CSA O437.0 fastened with at least two rows of fasteners to the exterior face of the lintel, and a single row to the top plates and studs. Fasteners shall conform to Table 9.23.3.5.

(2)A single piece of 89 mm thick lumber may be used in lieu of 2 pieces of 38 mm thick lumber on edge.

(3)If floor joists span the full width of the building without support, lintel spans shall be reduced by 15% for “Roof, ceiling and 1 storey”, by 20% for “Roof, ceiling and 2 storeys”, and by 25% for “Roof, ceiling and 3 storeys”.

(4)For ends of lintels fully supported by walls, provide minimum bearing length of 38 mm for lintel spans up to 3 m, or minimum bearing length of 76 mm for lintel spans greater than 3 m.

(5)Spans for 0.6 m tributary width are calculated for lintels in end walls that support only a 0.6 m width of roof and ceiling, but do not support roof joists, roof rafters or roof trusses.

(6)Lintel spans are calculated based on a maximum floor joist, roof joist or rafter span of 4.9 m and a maximum roof truss span of 9.8 m. Lintel spans may be increased by 5% if rafter and joist spans are not more than 4.3 m and roof truss spans are not more than 8.6 m. Spans may be increased by 10% if rafter and joist spans are not more than 3.7 m and roof trusses are not more than 7.4 m.

(7)Spans apply only where the floors serve residential areas as described in Table 4.1.5.3., or the uniformly distributed live load does not exceed that specified for residential areas as described in Table 4.1.5.3.

Table A-14 Maximum Spans for Hem – Fir Lintels – No. 1 or No. 2 Grade – Non-Structural Sheathing(1) Forming Part of Sentences 9.23.12.3.(1) and (3) and 9.37.3.1.(1)

Column 1

Column 2

Column 3

Column 4

Column 5

Column 6

Column 7

Column 8

Lintel Supporting

Lintel Size, mm(2)

Maximum Span, m(3)(4)

Exterior Walls

Interior Walls

Specified Snow Load, kPa

1.0

1.5

2.0

2.5

3.0

Limited attic storage and ceiling

2 – 38 × 89

This Area Intentionally Left Blank

1.31

2 – 38 × 140

1.87

2 – 38 × 184

2.27

2 – 38 × 235

2.78

2 – 38 × 286

3.23

Roof and ceiling only (tributary width of 0.6 m maximum)(5)

2 – 38 × 89

2.68

2.34

2.13

1.97

1.86

1.97

2 – 38 × 140

4.21

3.68

3.34

3.10

2.92

3.10

2 – 38 × 184

5.50

4.84

4.39

4.08

3.84

4.08

2 – 38 × 235

6.61

5.97

5.56

5.21

4.90

5.21

2 – 38 × 286

7.66

6.92

6.44

6.09

5.82

6.09

Roof and ceiling only (tributary width of 4.9 m maximum)(6)

2 – 38 × 89

1.31

1.13

1.00

0.91

0.84

0.91

2 – 38 × 140

1.87

1.61

1.43

1.30

1.20

1.30

2 – 38 × 184

2.27

1.95

1.74

1.58

1.42

1.58

2 – 38 × 235

2.78

2.39

2.13

1.92

1.71

1.92

2 – 38 × 286

3.23

2.77

2.47

2.17

1.94

2.17

Roof, ceiling and 1 storey(3)(6)(7)

2 – 38 × 89

1.01

0.93

0.86

0.81

0.76

0.69

2 – 38 × 140

1.44

1.32

1.23

1.14

1.05

0.95

2 – 38 × 184

1.75

1.61

1.47

1.34

1.23

1.12

2 – 38 × 235

2.14

1.96

1.76

1.60

1.48

1.35

2 – 38 × 286

2.49

2.22

2.00

1.82

1.69

1.55

Roof, ceiling and 2 storeys(3)(6)(7)

2 – 38 × 89

0.91

0.85

0.80

0.76

0.72

0.60

2 – 38 × 140

1.29

1.21

1.13

1.05

0.98

0.82

2 – 38 × 184

1.57

1.44

1.33

1.24

1.16

0.98

2 – 38 × 235

1.90

1.73

1.60

1.49

1.40

1.19

2 – 38 × 286

2.15

1.97

1.82

1.70

1.60

1.37

Roof, ceiling and 3 storeys(3)(6)(7)

2 – 38 × 89

0.85

0.81

0.77

0.74

0.69

0.55

2 – 38 × 140

1.21

1.14

1.06

1.00

0.95

0.76

2 – 38 × 184

1.43

1.33

1.25

1.18

1.12

0.91

2 – 38 × 235

1.72

1.60

1.50

1.42

1.35

1.10

2 – 38 × 286

1.95

1.82

1.72

1.63

1.55

1.27

Notes to Table A-14:

(1)Where structural sheathing is used, lintel spans may be increased by 15%. Structural sheathing consists of a minimum 9.5 mm thick structural panel conforming to CSA O121-M, CSA O151, CAN/CSA-O325.0 or CSA O437.0 fastened with at least two rows of fasteners to the exterior face of the lintel, and a single row to the top plates and studs. Fasteners shall conform to Table 9.23.3.5.

(2)A single piece of 89 mm thick lumber may be used in lieu of 2 pieces of 38 mm thick lumber on edge.

(3)If floor joists span the full width of the building without support, lintel spans shall be reduced by 15% for “Roof, ceiling and 1 storey”, by 20% for “Roof, ceiling and 2 storeys”, and by 25% for “Roof, ceiling and 3 storeys”.

(4) For ends of lintels fully supported by walls, provide minimum bearing length of 38 mm for lintel spans up to 3 m, or minimum bearing length of 76 mm for lintel spans greater than 3 m.

(5)Spans for 0.6 m tributary width are calculated for lintels in end walls that support only a 0.6 m width of roof and ceiling, but do not support roof joists, roof rafters or roof trusses.

(6) Lintel spans are calculated based on a maximum floor joist, roof joist or rafter span of 4.9 m and a maximum roof truss span of 9.8 m. Lintel spans may be increased by 5% if rafter and joist spans are not more than 4.3 m and roof truss spans are not more than 8.6 m. Spans may be increased by 10% if rafter and joist spans are not more than 3.7 m and roof trusses are not more than 7.4 m.

(7)Spans apply only where the floors serve residential areas as described in Table 4.1.5.3., or the uniformly distributed live load does not exceed that specified for residential areas as described in Table 4.1.5.3.

Table A-15 Maximum Spans for Spruce – Pine – Fir Lintels – No. 1 or No. 2 Grade – Non-Structural Sheathing(1) Forming Part of Sentences 9.23.12.3.(1) and (3) and 9.37.3.1.(1)

Column 1

Column 2

Column 3

Column 4

Column 5

Column 6

Column 7

Column 8

Lintel Supporting

Lintel Size, mm(2)

Maximum Span, m(3)(4)

Exterior Walls

Interior Walls

Specified Snow Load, kPa

1.0

1.5

2.0

2.5

3.0

Limited attic storage and ceiling

2 – 38 × 89

This Area Intentionally Left Blank

1.27

2 – 38 × 140

1.93

2 – 38 × 184

2.35

2 – 38 × 235

2.88

2 – 38 × 286

3.34

Roof and ceiling only (tributary width of 0.6 m maximum)(5)

2 – 38 × 89

2.55

2.23

2.02

1.88

1.77

1.88

2 – 38 × 140

4.01

3.50

3.18

2.96

2.78

2.96

2 – 38 × 184

5.27

4.61

4.18

3.88

3.66

3.88

2 – 38 × 235

6.37

5.76

5.34

4.96

4.67

4.96

2 – 38 × 286

7.38

6.67

6.21

5.87

5.61

5.87

Roof and ceiling only (tributary width of 4.9 m maximum)(6)

2 – 38 × 89

1.27

1.11

1.01

0.93

0.87

0.93

2 – 38 × 140

1.93

1.66

1.48

1.35

1.25

1.35

2 – 38 × 184

2.35

2.02

1.80

1.64

1.52

1.64

2 – 38 × 235

2.88

2.47

2.20

2.01

1.84

2.01

2 – 38 × 286

3.34

2.87

2.56

2.33

2.09

2.33

Roof, ceiling and 1 storey(3)(6)(7)

2 – 38 × 89

1.05

0.96

0.89

0.84

0.79

0.74

2 – 38 × 140

1.49

1.37

1.27

1.19

1.13

1.02

2 – 38 × 184

1.82

1.67

1.55

1.44

1.33

1.20

2 – 38 × 235

2.22

2.04

1.89

1.73

1.59

1.45

2 – 38 × 286

2.58

2.36

2.15

1.96

1.81

1.66

Roof, ceiling and 2 storeys(3)(6)(7)

2 – 38 × 89

0.94

0.88

0.83

0.79

0.76

0.64

2 – 38 × 140

1.34

1.26

1.19

1.13

1.06

0.88

2 – 38 × 184

1.63

1.53

1.44

1.33

1.25

1.05

2 – 38 × 235

1.99

1.87

1.72

1.60

1.50

1.27

2 – 38 × 286

2.31

2.12

1.96

1.82

1.71

1.45

Roof, ceiling and 3 storeys(3)(6)(7)

2 – 38 × 89

0.88

0.83

0.80

0.77

0.74

0.59

2 – 38 × 140

1.25

1.19

1.14

1.08

1.02

0.81

2 – 38 × 184

1.52

1.44

1.35

1.27

1.21

0.97

2 – 38 × 235

1.86

1.73

1.62

1.53

1.45

1.17

2 – 38 × 286

2.11

1.96

1.84

1.74

1.66

1.35

Notes to Table A-15:

(1)Where structural sheathing is used, lintel spans may be increased by 15%. Structural sheathing consists of a minimum 9.5 mm thick structural panel conforming to CSA O121-M, CSA O151, CAN/CSA-O325.0 or CSA O437.0 fastened with at least two rows of fasteners to the exterior face of the lintel, and a single row to the top plates and studs. Fasteners shall conform to Table 9.23.3.5.

(2)A single piece of 89 mm thick lumber may be used in lieu of 2 pieces of 38 mm thick lumber on edge.

(3)If floor joists span the full width of the building without support, lintel spans shall be reduced by 15% for “Roof, ceiling and 1 storey”, by 20% for “Roof, ceiling and 2 storeys”, and by 25% for “Roof, ceiling and 3 storeys”.

(4)For ends of lintels fully supported by walls, provide minimum bearing length of 38 mm for lintel spans up to 3 m, or minimum bearing length of 76 mm for lintel spans greater than 3 m.

(5)Spans for 0.6 m tributary width are calculated for lintels in end walls that support only a 0.6 m width of roof and ceiling, but do not support roof joists, roof rafters or roof trusses.

(6)Lintel spans are calculated based on a maximum floor joist, roof joist or rafter span of 4.9 m and a maximum roof truss span of 9.8 m. Lintel spans may be increased by 5% if rafter and joist spans are not more than 4.3 m and roof truss spans are not more than 8.6 m. Spans may be increased by 10% if rafter and joist spans are not more than 3.7 m and roof trusses are not more than 7.4 m.

(7)Spans apply only where the floors serve residential areas as described in Table 4.1.5.3., or the uniformly distributed live load does not exceed that specified for residential areas as described in Table 4.1.5.3.

Table A-16 Maximum Spans for Glued-Laminated Timber Lintels – 20f-E Stress Grade – Exterior Walls – Roof and Ceiling Load Only Forming Part of Sentences 9.23.12.3.(1) and (3) and 9.37.3.1.(1)

Col. 1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

Lintel Size, mm

Maximum Span, m(1)(2)(3)

Specified Snow Load, kPa

1.0

1.5

2.0

2.5

3.0

Supported length, m(4)(5)

Supported length, m(4)(5)

Supported length, m(4)(5)

Supported length, m(4)(5)

Supported length, m(4)(5)

2.4

3.6

4.8

2.4

3.6

4.8

2.4

3.6

4.8

2.4

3.6

4.8

2.4

3.6

4.8

130 × 304

6.23

5.63

5.24

5.63

5.09

4.73

5.24

4.73

4.40

4.95

4.48

4.17

4.73

4.28

3.87

80 × 380

6.52

5.89

5.48

5.89

5.32

4.96

5.48

4.96

4.52

5.19

4.69

4.11

4.96

4.39

3.80

130 × 342

6.80

6.15

5.72

6.15

5.56

5.17

5.72

5.17

4.81

5.41

4.89

4.55

5.17

4.67

4.35

80 × 418

7.00

6.33

5.89

6.33

5.72

5.32

5.89

5.32

4.96

5.57

5.03

4.52

5.32

4.81

4.18

130 × 380

7.36

6.65

6.19

6.65

6.01

5.59

6.19

5.59

5.21

5.86

5.29

4.92

5.59

5.06

4.70

80 × 456

7.48

6.76

6.29

6.76

6.10

5.68

6.29

5.68

5.29

5.95

5.37

4.93

5.68

5.13

4.56

130 × 418

7.91

7.15

6.65

7.15

6.46

6.01

6.65

6.01

5.59

6.29

5.68

5.29

6.01

5.43

5.05

80 × 494

7.94

7.17

6.68

7.17

6.48

6.03

6.68

6.03

5.61

6.31

5.71

5.31

6.03

5.45

4.94

80 × 532

8.39

7.58

7.06

7.58

6.85

6.38

7.06

6.38

5.93

6.67

6.03

5.61

6.38

5.76

5.32

130 × 456

8.44

7.63

7.10

7.63

6.89

6.41

7.10

6.41

5.97

6.71

6.07

5.65

6.41

5.80

5.39

Notes to Table A-16:

(1)Spans are valid for glued-laminated timber conforming to CAN/CSA-O122-M and CAN/CSA-O177-M.

(2)Provide a minimum bearing length of 89 mm. (Alternatively, the bearing length may be calculated in accordance with Part 4.)

(3)Top edge of lintel assumed to be fully laterally supported.

(4)Supported length means half the length of trusses or rafters, plus the length of overhang beyond the wall.

(5)For intermediate supported lengths, straight interpolation may be used.