Civil Engineering Reference
In-Depth Information
Table 14.15:
Technical properties of secondary climatic materials
Technical properties
Specific
Specific
thermal
thermal
Specific vapour
conductivity
capacity
penetration
(1)
Material
(W/mK)
(kJ/kg K)
(mg/m
2
h Pa)
Metals:
Steel
58
0.4
Vapour-proof
Non-metallic minerals:
Lime sandstone
0.7
0.88
0.6
Lime render
0.9
0.96
0.4-1
Lime cement render
1.05
0.2-0.5
Cement render
1.15
0.92
0.03-0.4
Concrete
1.75
0.92
0.03-0.4
Stone:
Granite
3.5
0.8
Limestone
2.9
0.88
Brick:
Light/medium fired
0.65
0.92
1.4
Well-fired: solid
0.7
0.92
Well-fired:
perforated
0.6
0.92
Earth (pisé and adobe):
With fibre 10 kg/m
3
0.96
1
Approx. 1.5
With fibre 40 kg/m
3
0.615
1
Approx. 2
With fibre 70 kg/m
3
0.420
1.05
Approx. 2
Timber:
Pine/spruce perpendicular to the fibres
0.12
2.6
0.05-0.09
(2)
Parallel with the fibres
0.35
2.6
Oak/beech perpendicular to the fibres
0.165
Parallel with the fibres
0.35
Notes:
(1) This is the vapour penetration through a 1 mm-thick layer.
(2) A 15 mm thick piece of spruce panelling has a vapour penetration of 0.35 mg/m
2
h Pa.
poisonous additives, however, makes it necessary to dump the waste at special
depots. The pure products can and should be composted, as normal dumping
will lead to increased nutrients seeping into the ground water from the tip.
Materials based on recycled textiles
Products have been introduced in recent years based on unspecified recycled
plastic-based and natural fibres. Melted down fibres of polyester are added
(12-15 per cent by weight) to produce mats for thermal insulation.
