Table 16 Diffusion Resistance Factors
|
Material
|
Diffusion Resistance Factor
|
|
|
|
|
Brick (common)
|
6.7 - 10
|
|
Brick (sand lime)
|
8.6 - 71
|
|
|
|
|
Cement mortar
|
37.5 - 50
|
|
Concrete (pumice)
|
5.8 - 30
|
|
Concrete (gas)
|
5.1 - 11.9
|
|
|
|
|
Cork slab
|
2.5 - 15
|
|
Hardboard
|
80 - 200
|
|
|
|
|
Insulating board
|
2.4 - 6
|
|
Lime mortar
|
8.6 - 9.8
|
|
Mineral wool (bituminised)
|
1.55 - 1.75
|
|
|
|
|
Plaster
|
7.0 - 12
|
|
|
|
|
Plywood
|
210 - 670
|
|
Wood-wool slab
|
2.5 - 5.1
|
