Civil Engineering Reference
In-Depth Information
Table 15.7:
Environmental profiles of roof coverings
Pollution effects
Ecological potential
Quantity of
Environ-
Effect on resources
material used
Extraction and
Building
In the
As
Re-use and
Local
mental
Material
(kg/m
2
)
Materials
Energy
Water
production
site
building
waste
recycling
production
profile
Galvanized steel,
from ore
6
3
2
2
3
1
2
2
✓
3
Aluminium, 50%
material recycling
4
2
3
3
3
1
2
2
✓
3
Copper from ore
6
3
3
3
3
1
3
3
✓
3
Concrete tiles
50
1
2
2
2
1
1
1
(1)
✓
✓
2
Sheets made of
cellulose-reinforced
concrete
13
1
2
2
1
1
1
1
✓
✓
1
Slate
85
1
1
1
1
1
1
1
✓
✓
1
Fired clay tiles
35
1
2
2
2
1
1
1
(1)
✓
✓
2
Polyester roofing
felt with bitumen
2
3
2
3
2
1
2
3
PVC sheeting
1.5
3
2
3
1
3
3
3
Timber boarding,
without impregnation
18
1
1
1
1
1
1
1
✓
1
Timber boarding,
impregnated
16.5
2
1
2
2
2
3
3
✓
3
Turf roof on poly-
ethylene sheeting
300
2
2
2
1
1
2
✓
✓
2
(3)
Straw thatch
25
1
1
1
1
2
(2)
1
1
1
Notes:
(1) Certain colour pigments with heavy metals make it necessary to give the material a lower evaluation as a waste product.
(2) Exposure to dust.
(3) Higher score when used in urban areas, due to very positive effect on air quality
