This is picture of my floor to ceiling window where it meets the floor. I am about to lay the insulation boards for below the ufh(example board cut in photo) but I am unsure how to finish off this area from the floor across to the window. Should I just leave as is per photo and just run the concrete screed straight across from here to meet the cavity insulation board? Alternatively do I knock that last course of brick out and run the insulation right through to meet the cavity insulation therefore all ufh within the insulation.
Also I am using paper backed insulation boards rather than foil with a standard concrete screed. Do I need to a plastic sheet over the top of this prior to screed going down or tape the joins?
thanks
Stephen