Hi, I have a house built in 1964 with blocks+bricks cavity on the ground floor (cavity has been insulated in the past with blow-in fiber insulation) and the blocks + blocks + Rosemary tiles cavity wall on the first floor. This cavity has been left uninsulated for some reasons. I guess, because it's not easy to remove tiles. My question is: can the cavity be insulated by drilling from the inside? Or, any other suggestions?
Thank you,
Sergey