In article , Dave Plowman
writes
In article ,
Steve Firth wrote:
Done this in Italy where I simply pointed over the foam using lime
mortar, and a frenchman to ensure a neat finish. It's lasting well.

Interesting. The rather limited instructions with the windows caution
against using mortar because of expansion of the frame - it's UPVC.
Ok, so how about 2mm thick of frame sealant applied in the same way, it'll
get a nice key of the open cell foam.
--
fred