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Tape the wall and frame with this :-
https://www.sealantsonline.co.uk/Products/Everbuild-mammoth-professional-blue-masking-tape/EVE1251push some caulk saver in there :-
https://www.sealantsonline.co.uk/ProductGrp/0044003d0002and then :-
https://www.sealantsonline.co.uk/Products/Geocel-201-external-polymer-mastic-sealant/GEO4120
Airhead
I’ve got some French doors around which we are seeing moisture ingress/damp. Inspection immediately reveals why. Am I right in thinking fill with some kind of expanding foam, cut back, mortar over the top? Gap is about 55mm deep, goes up to 8mm at its widest. My usual DIY approach is to pay someone to do things, please instruct me in the simplest possible terms.