Insulating from the outside: wood fibre vs rockwool vs perforated polystyrene

[Garald]

1 hour ago, Mike said:

At least one - https://www.propassif.fr/. But the database in international - https://database.passivehouse.com/en/components/list/ventilation_small? - and Efficiency Ratio is the key number.

 

I see a lot of units. What is really important (beyond getting a quiet unit with a high efficiency rate, I know) is to find a unit that can be installed at all, and an installer who can install it! Remember that this is an old house. There are the conduits for the PIV (not extremely broad, and only one "mouth" per floor) and the old chimney conduits. I think the installation will be easy in the ground floor, thanks to a false ceiling, but I'm not sure of how it would be done in the other floors.

 

(I take the 'heart' of the unit could go in the garage, which is inside the house?)

 

So really what I want is good MVHR installer who is technically wily and also frank about what can and cannot be done.

[Mike]

24 minutes ago, Garald said:

(I take the 'heart' of the unit could go in the garage, which is inside the house?)

Yes, ideally in an insulated cupboard.

 

26 minutes ago, Garald said:

the old chimney conduits.

If you can get some insulated duct through them, and if the adjacent flues are dead, then it's a possibility - preferably the intake down one and the exhaust up another, so that the air from the latter doesn't contaminate the former. Though if connecting to a unit in the garage you'd ideally you'd take them through the garage wall / roof.