Wood quantities

 

Table 47  Wood quantities: Sawn, planed and tongue & groove timber. Linear metre per square metre (excl. waste).

Sawn timber

Planed timber

T&G timber

(thickness 12–33 mm)

Width (B)

Width (B)

Coverage width (C)

Width (B)

(mm)

Wood quantity

(lm/m2)

Width (B)

(mm)

Wood quantity

(lm/m2)

Width (C)

(mm)

Wood quantity

(lm/m2)

50

20.00

  45

22.22

63

15.87

58

17.24

75

13.33

70

14.29

60

16.67

100

10.00

  95

10.53

85

11.76

125

  8.00

120

  8.33

110

  9.09

150

  6.67

145

  6.90

135

  7.41

175

  5.71

170

  5.88

160

  6.25

200

  5.00

195

  5.13

225

  4.44

220

  4.55

250

  4.00

245

  4.08

Example: Tongue & groove timber
A wall area of 10 m2 is to be clad in tongue & groove boards that have a coverage width of 85 mm.
The amount needed will be 11.76 lm/m2, i.e. 10 m2 x 11.76 = 117.6 lm (excl. waste)..

 

Table 48  Wood quantities: Board and batten: back board and cover batten or board on board: back board and front board, 20 mm overlap
Linear metre per square metre (excl. waste).

Back board (BB)/Cover batten (CB)

Width (mm)

Wood quantity (lm/m2)

BB

70

CB

45

13.33

BB

95

CB

45

10.00

BB

120

CB

45

8.00

BB

145

CB

45

6.67

BB

170

CB

45

5.71

Back board (BB)/Front board (FB)

Width (mm)

Wood quantity (lm/m2)

BB

70

FB

70

10.00

BB

95

FB

70

8.00

BB

95

FB

95

6.67

BB

120

FB

70

6.67

BB

120

FB

95

5.71

BB

120

FB

120

5.00

BB

145

FB

70

5.71

BB

145

FB

95

5.00

BB

145

FB

120

4.44

BB

145

FB

145

4.00

BB

170

FB

70

5.00

BB

170

FB

95

4.44

BB

170

FB

120

4.00

BB

170

FB

145

3.64

BB

170

FB

170

3.33

 

avt-sid146-1-en.jpg

avt-sid146-2-en.jpg


Example: Board on board: back board (BB) and front board (FB)

A wall area of 20 m2 is to be clad in board on board, with back boards (BB) 22 x 145 and front boards (FB) 22 x 120.

The amount needed will be 4.44 lm/m2 of each size, i.e. 20 m2 x 4.44 = 88.8 lm of 22 x 145 and 88.8 lm of 22 x 120 (excl. waste).

 

Table 49  Wood quantities: Studs, counter battens, battens. etc
Linear metre per square metre (excl. waste).

Centre spacing (mm)

Wood quantity (lm/m2)

200

5.00

300

3.33

400

2.50

500

2.00

600

1.67

800

1.25

1,000

1.00

1,200

0.83

Note
The length of one stud or batten must be added to the total linear metres (lm).

Example: Vertical studs
Vertical studs with a centre-spacing of 600 mm, for a wall area of height 3 m and length 12 m.
The amount needed will be 1.67 lm/m2, i.e. 3 x 12 = 36 m2 x 1.67 = 60.12 lm + height 3 m = 63.12 lm (excl. waste).

avt-sid147-en.jpg

Example: Horizontal nailing battens

Horizontal nailing battens with a centre-spacing of 600 mm, for a wall area of height 3 m and length 12 m.

The amount needed will be 1.67 lm/m2, i.e. 3 x 12 = 36 m2 x 1.67 = 60.12 lm + height 12 m = 72.12 lm (excl. waste).

 

Table 50  Wood quantities: Fencing
No. of pickets or boards per linear metre (excl. waste).

Width of pickets

(mm)

Picket spacing (mm)

 

0

20

30

40

50

60

70

80

90

100

110

120

130

140

150

 

Wood quantity (lm/m)

45

22.22

15.39

13.33

11.76

10.53

9.52

8.70

8.00

7.41

6.90

6.45

6.06

5.71

5.41

5.13

70

14.29

11.11

10.00

9.09

8.33

7.69

7.14

6.67

6.25

5.88

5.56

5.26

5.00

4.76

4.55

95

10.53

8.70

8.00

7.41

6.90

6.45

6.06

5.71

5.41

5.13

4.88

4.65

4.44

4.26

4.08

120

  8.33

7.14

6.67

6.25

5.88

5.56

5.26

5.00

4.76

4.55

4.35

4.17

4.00

3.85

3.70

145

  6.90

6.06

5.71

5.41

5.13

4.88

4.65

4.44

4.26

4.08

3.92

3.77

3.64

3.51

3.39

170

5.88

5.26

5.00

4.76

4.55

4.35

4.17

4.00

3.85

3.70

3.57

3.45

3.33

3.23

3.13

Note
The amount of waste varies a great deal depending on the length of the pickets.

avt-sid148-1-en.jpg
Example: Vertical pickets
The width of the pickets is 95 mm, the spacing between them is 20 mm, their length is 0.80 m and the fence is 40 m long.
The number of pickets per linear metre is 8.70.
The amount needed will be 0.80 x 40 x 8.70 = 278.4 lm (excl. waste).

avt-sid148-2-en.jpg

Example: Horizontal boards

The width of the boards is 45 mm, the spacing between them is 20 mm, and the fence is 0.8 m high and 40 m long.
The number of boards per linear metre is 15.39.
The amount needed will be 0.80 x 40 x 15.39 = 492.5 lm (excl. waste).

 



Table 51  Wood quantities and minimum edge-to-edge spacing: Decking
No. of linear metres per square metre (excl. waste)

Type of decking

Width (mm)

Edge-to-edge spacing (mm)

Wood quantity (lm/m2)

Treated pine decking

Wood preservation class: NTR A or NTR AB

Colour: green or brown

45

48

20.83

70

74

13.51

95

100

10.00

120

126

7.94

145

152

6.58

Untreated heartwood decking

Wood species: pine or larch

120

126

7.94

145

152

6.58

Impregnated and linseed oil, pressure and heat pigmented decking, e.g. using the Royal method.

95

100

10.00

120

126

7.94

145

152

6.58

Heat-treated decking

92

95

10.53

105

109

9.17

118

122

8.20

142

147

6.80

Acetylated decking

140

143

6.99

190

193

5.18

195

198

5.05

Furfurylated decking

95

101

9.90

120

125

8.00

145

151

6.62

Silicon treated decking

95

100

10.00

120

127

7.87

145

154

6.49

170

181

5.53

Western red cedar (Thuja plicata) decking

141

147

6.80

193

202

4.95

Example: Treated decking
A deck of 40 m2 is to be laid with treated decking, wood preservation class NTR AB, that has a width of 120 mm and will be installed with an edge-to-edge spacing of 126 mm. The amount needed will be 7.94 lm/m2, i.e. 40 2 x 7.94 = 317.6 lm (excl. waste).

avt-sid149-en.jpg

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