RICS - Open cell spray foam

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So I've seen this
https://www.mortgagestrategy.co.uk/news/rics-launches-guidance-on-the-use-of-spray-foam/
And I guess that's their "latest advice" What do people here think of that? I take it as there's still no definitive answer from mortgage vendors as an industry
They've mentioned what Nationwide say but there's no things there to say the wider mortgage companies say x
https://www.mortgagestrategy.co.uk/news/rics-launches-guidance-on-the-use-of-spray-foam/
And I guess that's their "latest advice" What do people here think of that? I take it as there's still no definitive answer from mortgage vendors as an industry
They've mentioned what Nationwide say but there's no things there to say the wider mortgage companies say x
0
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The only thing that seems to be missing, and I don't think it should actually be in this document, is a Guide on how to retrofit UK properties with spray insulation correctly. This sort of guidance needs input from Building Control, manufacturers, building scientists and industry experts and RICS. I do think it sits in a seperate document, but the RICS Guide above could reference this document.
Unless ofc a surveyor would simply want to make sure it was "installed correctly" as per their documentation on whether it will impact the valuation of your house?
FWIW, the quote that I've got from a nationwide company with apparently all the relevant certifications is £1750
Regarding the above, I guess mortgage companies wouldn't have an issue provided it's properly installed?
I think you are still left with talking to individual mortgage companies, and this means that applying spray foam to your own home is quite likely to make it unmortgageable - your company might accept it, but this doesn't guarantee that any mortgage company in future would accept it.
Likewise, insulation applied to the roof timbers under the tiles, by whatever means, will not work unless you block all the existing ventilation to the loft and also unless you insulate the gable end walls of your loft. But insufficient ventilation will turn your house into a bit of a sauna, damp and steamy.
If you are not receiving these same warnings from your architect then you are being lead astray.