Insulating existing brick veneer walls

G'day In these wintr'y days, one's thoughts turn to insulation, lots of it. My specific problem is that part of the house is brick veneer, but when it was built terracotta vents were inserted into the wall ABOVE the floor line, i.e. there was no significant ventilation direct under the floor, venting was into the cavity only. I've now solved that problem, Aleta vents under the subfloor. The next task is to insulate the walls. 2 questions arise: 1. What';s the best way to get the...

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