ASHP & triple glazing

[Joeboy]

https://phstore.co.uk/tescon-profect/
Found a 12/38mm airtight prefolded tape. It has potential to work with the 40mm finishing trim. Would have to find a 12.5mm thick product that doesn't fracture when cut thin as plasterboard does. Hmmn...

Then I found Aerosana Visconn and fell right down the rabbit hole!

https://www.earthwiseconstruction.co.uk ... f1Qem22RFv

That's reads to me as if visconn combined with a quality low expansion foam gets the job done for airtightness?

https://www.dortechdirect.co.uk/catalog ... fREALw_wcB

[Joeboy]

Last one from me for a bit. That was an interesting day. I've found a slow expanding frame fitment tape (for 65mm frames, mail sent to maker re 90mm frames), quality low expanding foam which will add to the r value in a tiny way as well as keeping the air out externally as well as internally and also an airtight membrane to brush onto the low exp foam that can bridge 3mm gaps and remain flexible.

SWMBO reiterated her wish that there be no plastering and minimal dust. Internal tape is right out the window (hah).

I'll see what the surveyor & fitter say but I'll be happy with the low expansion foam and brushable airtight membrane as my solution if there is resistance to the trufit tape. Interesting times ahead in a few weeks.

I'm glad I went hunting and found these products. Good to find that technology and product development keep evolving.

I then had a serious think to myself about tapes, structure, substrate, longevity, various water levels, windspeeds and atmospheric moisture as well as build stability, expansion & contraction, the multiple strategies touted online as best practice and realised that it's all arse. Do what your budget & situation dictate with an eye and hope on longevity. No two same situations.

CP, thank you for your help, very much appreciated.