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A friend was looking at a house with spray insulation under the roof tiles. It had no fire certificate that I could find from the manufacturer and the installer wouldn’t cooperate with producing one. You’d have to destroy the roof to get it off and roofs are designed to breathe so the thing probably would have rotted. Proper sketchy stuff.
The cork wall spray does look to have a fire cert though.
I just can’t see that such a tiny amount of insulation will make a difference. 50mm of PIR is the minimum I’d say to notice a difference. Then vapour barrier and 25mm batons on top then plasterboard, but you’ll be coming 80mm into the room so you’ll need to mess about with wiring and window reveals and what not. A great deal more effort than squirting something on the wall.
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Hefty
There are definitely methods for making board insulation snug, but part of me really worries about any spray on insulation. Especially after so many people basically ruined their houses with it, lol.
https://www.mortgagesolutions.co.uk/news/2021/12/21/rpsa-warns-250000-homes-could-be-unmortgageable-due-to-spray-foam-insulation/