Environmental Profiles Of Structural Materials Reading Guidelines For Table 138

The estimates and evaluations are made per m2 off loor space andahouse lifespanof 50 years. All materials are assumed to last this long without renewal.

The volumes of materials and the loss factors are estimated on the basis of conventional practice.

The effects of additional material properties, such as thermal storage capacity and thermal conductivity, are not included.

Calculation of global warming potential GWP include carbonatation (50 years), storing of carbon dioxide (50 years) and emissions from final incineration of products based on fossilfuels.The storing of carbon is calculated from net weight of material (exclusive losses).

The environmentalevaluationsareratedwith best = 1,average = 2andworstalter-native = 3.The Environmental potential columns indicate potentials for recycling and local production.The final environmental profile is suggested on the basis of subjective judgement from the author and is open to debate. On the basis of information in Table 1.4 and Table 2.8 alternative evaluations can be made. Also note the results in the GWP column, since global warming potential is often considered as a relevant overall indicator for environmental impacts.

Table 13.7 The impact of building weight on energy demand for heating, location in Central Europe

Outer/inner structure

Single family dwelling %

Multi family dwelling %

Office building (with cooling) %

Light/light

100

100

100

Light/heavy

85

94

94

Heavy/light

95

100

98

Heavy/heavy

103

103

93

Table 13.8 Environmental prefiles of structural materials

Material

Compressive Tensile Loss Quantity Global warming strength strength factor needed potential GWP

50 years) m2 50 years)

Environmental evaluations

Effects on resources

Effects of pollution

Environmental potential

Environmental profile

Effects of pollution

Environmental potential

Environmental profile

Materials

Energy

Production and use

As waste

Recycling

Local production

Horizontal structures

Steel beams, recycled

5400

5400

5

40

42

3

2

2

3

H

2

Aluminium beams, 85% recycled

4300

4300

5

15

49

3

3

3

3

3

In situ concrete, reinforced

150-700

7.5-35

15

460

73

2

3

2

2

H

2

Precast concrete elements

150-700

7.5-35

7

405

66

2

2

2

2

H

H

2

Aerated concrete elements

30

4-5

7

135

34

2

3

2

2

H

2

Light aggregate concrete elements

30

4-5

7

200

62

2

3

3

2

H

3

Wood beams, untreated

450-550

900-1040

15

47

-21

1

1

1

1

H

H

1

Wood beams, laminated

470

1040

7

37

2

1

1

2

2

2

Massive wood elements, untreated

450

900

7

110

-53

1

2

1

1

H

H

1

Vertical structures

Steel studwork, recycled

5400

5400

5

30

31

3

2

2

3

H

2

Aluminium studwork, 85% recycled

4300

4300

5

10

32

3

2

3

3

3

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