Environmental Profiles Of Surface Materials Table 1511

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RULES OF READING

The estimates and evaluations are made per m2 layerand a house lifespan of 50 years.

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 structural properties, are not included.

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

The environmental evaluations are rated best = 1, average = 2 and worst alternative = 3.The Environmental potential columns indicate potentialsfor recycling and local production. The final environmental profile is suggested on the basis of subjective judgement from the authorand are open to debate. On the basis of information inTable 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 forenvironmental impact.

Table 15.11a Roofing

Environmental evaluations

Table 15.11a Roofing

Environmental evaluations

Material

Durability (years)

Loss factor (%)

Quantity of material needed (kg/m2 50 years)

Global warming potential GWP (kg CO2-equ./m2

Effects on resources

Effects of pollution

potential

Env. profile

50 years)

Materials

Energy

Production and use

As waste

Recycling

Local production

Corrugated galvanized steel sheeting from ore, 6.8 kg/m2

30

15

13

29

3

3

3

3

H

3

Corrugated aluminium sheeting from ore, 2.4 kg/m2

50

15

2.8

42

3

2

3

2

H

3

Copper sheeting from ore, 5.4 kg/m2

50

12

6.0

36

3

3

3

3

H

3

Concrete tiles, 50 kg/m2

50

3

52

7.3

2

2

2

2

H

2

Corrugated fibre reinforced cement slabs, 13 kg/m2

35

10

20

6.5

2

2

2

2

H

2

Slate, 85 kg/m2

50

5

90

1.3

1

1

1

1

H

H

1

Fired clay tiles, 35 kg/m2

50

3

36

6.8

2

2

2

1

H

H

2

Bitumen sheeting, 5.2 kg/m2

25

10

12

14

3

3

3

3

3

Polyvinyl chloride sheeting, 2 kg/m2

25

10

4.4

19

3

3

3

3

3

Timber, untreated, 18 kg/m2

15

20

69

8.0

2

2

1

1

H

2

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