I am in the middle or a garage conversion and I am looking at bricking up the garage door way, no window. I have had building control round, and there are a couple of ways I can do it such as outer leaf brickwork stud inside, or a cavity wall. BC aren't overly concerned with any damp issue etc as the garage door area is quite sheltered by the house / garage roof overhang. Basically left it to my preference / risk. My question is if I want to do it it in a typical cavity wall manner, i.e outer leaf in brick to match existing, 100mm cavity with insulation, inner leaf of solid dense block. Can I just wall tie into the pier at either side? As in, anyone foresee much issue with damp transferring through the solid pier to the internal at either end. Piers are about 325mm thick/deep, and i presume solid. Also a timber beam supporting the garage roof sits across the doorway, resting on the piers, hence I want try and avoid propping the beam and rebuilding the piers to open up a cavity. Any advice / experience would be much appreciated. Oh, and internal wall will be dot and dabbed, or battened and plaster boarded. Space will be new kitchen area.