Planning notes INTELLO
The 60/2 rule
respectively 60/10 rule - using the g-value
or: 60/1.64 rule - using water vapor permeance
There is increased humidity in new buildings, kitchens and bathrooms. The diffusion resistance of a vapour retarder should be selected in such a way that a
- diffusion resistance (sd-value) of at least 2 m
- diffusion resistance (g-value) of at least 10 MN·s/g
- diffusion permeability (perm rate) of at most 1.64 US perms
is achieved even at 60 % average relative humidity. The structure will then be sufficiently protected against the entry of moisture from the indoor air and against mould formation.
INTELLO and INTELLO PLUS have a sd-value of approx. 4 m, a g-value of approx. 20 MN·s/g
and a perm rate of approx. 0.82 US perms at 60 % r.h.
The 70/1.5 rule
respectively 70/7.5 rule - using the g-value
or: 70/2.2 rule - using water vapor permeance
There is very high humidity in buildings during the construction phase when walls are being plastered or screed is being laid. The diffusion resistance of a vapour retarder should be greater than 1.5 m (sd-value) or 7.5 MN·s/g (g-value), resp. lower than 2.19 US perms (perm rate) at 70 % average relative humidity in order to protect the structure against excess entry of moisture from the building site climate and against mould
formation. A high degree of protection against
moisture is particularly necessary when there are wood-based panels on the outside of the building structure.
INTELLO and INTELLO PLUS have an sd-value of 2 m, an g-value of 10 MN·s/g
and a perm rate of approx. 1.64 US perms at 70 % relative humidity.