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Hello all,

I was wondering how concerning is inward vapour drive in a cold/temperature cloudy and rainy climate.

The Wall I have in mind is comprised by brick, 2´´ unventilated air cavity and steel framed wall. The steel framed wall is the following:
– External 4´´ rockwool insulation
– Cement board sheathing
– 4.7´´ Rockwool batt insulation
– 2 layers of gypsum plasterboard
– Possibly vapour open painting on the interior

I obviously have a reservoir cladding (brick) which will see a lot of rain water. However, in this climate, 90% of the day is cloudy and practically no indoor cooling is used. On top of that I will not have a vapour barrier on the inside.

Although I acknowledge that having a reservoir cladding, coupled with a non-vented cavity and vapour open assembly can be risky. Is really that risky when the inward vapour drive forces/ diffusion (solar radiation, cooled interior) is low and there is no vapor barrier on the inside? Is this a risky wall assembly?

Thank you in advance

CP