Does Fixit fix it?

[Garald]

)As some people here know by now, I'm renovating a place near Paris. In particular, we will insulate it.

 

On the SES and WSW sides, we will use 145mm of BioFib Trio (hemp-cotton-linen), meaning about 180mm in total, counting air layers and a fireproof panel; this will amount to R=3.80 in insulation alone. (R=3.7 is some magical French threshold.) However, on the NWN, we do not have that kind of space - we do not have it in the staircase, or in the bathroom, or in the toilet, and we'd rather not lose too much space in the bedroom either (though in principle we could).

 

After a lot of looking around, and feedback from this site, my architect proposes the following aerogel-based product:

https://www.fixit-aerogel.com/en/the-innovation

 

Does anybody here have experience with this kind of product?

 

(This is aerogel plaster. Aerogel panels or blankets are not yet available in the French market, for whatever reason. The performance is not at the same level as Spacetherm, but it is still substantially better than BioFib: since the conductivity is lambda=0.028, 80mm would give us R=2.857 (below the norms but already rather reasonable) and 105mm would give us R=3.75. Not sure how thickly one can lay it on, though; my architect suspects it may be brittle.)

 

Is it likely to be safe in the long run for a bedroom? (Fumes?)

 

 

 

[Garald]

(PIR and PUR were thrown about as possibilities, but I would not want to have them in the bedroom because of fire-related reasons. The staircase is the only escape route; of course jumping from a first floor is a no-brainer, but not everybody necessarily feels the same way when under pressure.)