Environmental Profiles Of Climatic Materials Table 1411

RULES OF READING

The volumes of materials and the loss factors are estimated onthe 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 dioxide (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 onthe 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 impact.

THERMAL INSULATION

The estimates and evaluations are made per m2 of insulation layer with R-value 3.75 (=150 mm with specific thermal conductivity 0.04 W/mK) and a house lifespan of 50 years. All insulation materials are assumed to last this long without renewal, except straw bales which must be renewed once.

WIND BARRIERS, VAPOUR MEMBRANES/AIR BARRIERS, DAMP-PROOF COURSES AND FLASHINGS

The estimates and evaluations are made per m2 layer and a house lifespan of 50 years. With the exception of most flashings all materials are assumed to last this long without renewal.This might however be a too optimistic approach.

Table 14.11a Thermal insulation

Material

Specific Specific Loss Quantity needed Global warming thermal thermal factor for thermal potential GWP

conductivity capacity [%] resistance [kg COs-equ./m2

50 years]

Still air

0.024

1.0

-

-

-

Water

0.5

4.2

-

-

-

Dry snow

0.05

-

-

-

Wet snow

0.47

-

-

-

Aerated concrete blockwork, 500 kg/m3

0.08

1.0

10

165

68

Expanded perlite, untreated, 80 kg/m3

0.05

1.0

1

15

8.5

Foam glass boards, 110 kg/m3

0.043

1.1

10

20

25

Glasswool, 18 kg/m3

0.038

1.0

5

2.5

4.5

Rockwool, 30 kg/m3

0.038

1.0

5

4.5

7.5

Expanded clay pellets, 450 kg/m3

0.11

1.0

1

185

66

Foamed polystyrene EPS, 20 kg/m3

0.038

1.5

10

3.1

22

Foamed polystyrene XPS with HCFC's, 30 kg/m3

0.036

1.5

10

4.5

113

Foamed polyurethane, 35 kg/m3

0.028

1.2

10

4.1

68

Cork boards, untreated, 130 kg/m3

0.04

1.7

10

21

4.0

Wood shavings, refined, 80 kg/m3

0.045

2.1

1

14

7.5

Wood fibre, loose fill, 45 kg/m3

0.039

1

6.9

1.5

Woodfibre matting with starch glue, 45 kg/m3

0.039

2.1

5

7.2

1.5

Environmental evaluations

Effects on resources

Effects of pollution

Env. potential

Env. profile

Materials Energy

Production and use

As waste

Recycling Local production

- - -

- - -

- - -

- - -

3 3

2

2

3

2 2

2

1

V

2

2 3

2

2

2

2 2

3

3

2

2 2

3

3

2

3 3

2

1

V

3

3 3

3

3

3

3 3

3

3

3

3 3

3

3

3

1 3

1

1

1

1 1

1

1

V V

1

1 2

1

1

V

2

1 2

1

1

2

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