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Hi
Had a new window installed and looking for any advice on whether to close this cavity or not? Seems to be pros for both.
Secondly would you tape internal window joins to the brick or to new stud work, behind insulation?
Looking at Using Siga Fentrim IS2, or Illbruck Duo Membrane/ME316 tapes?
Lastly there’s a hell of a draft coming down my internal lintels, is it ok to pop insulation/thermal foam in between them?

Had a new window installed and looking for any advice on whether to close this cavity or not? Seems to be pros for both.
Secondly would you tape internal window joins to the brick or to new stud work, behind insulation?
Looking at Using Siga Fentrim IS2, or Illbruck Duo Membrane/ME316 tapes?
Lastly there’s a hell of a draft coming down my internal lintels, is it ok to pop insulation/thermal foam in between them?
