Hi, just stumbled across this forum while looking for an answer regarding removal of flue blocks. I own a new build house with a pre-fabricated flue block chimney, i am in the process of opening up the fireplace to have a woodburner fitted, i need to remove about 1 metre high of flue blocks and put a lintel in but im worried that when i remove the lower blocks the remaining blocks will come tumbling down. I would hope they are tied in with the brick / blockwork but would like some guidance before i start. Thanks in advance. Dave