I've stripped some plaster to bare brick and noticed a few black blocks at the base of the brickwork on the inner leaf of the outside walls. They don't feel very strong (I can drill trough far easier than in bricks), so out of interest how can they be so strong as to support the weight of all the bricks above???
They look like breeze blocks but in black so cannot be made out of concrete (and are nowhere as firm). Just wondering what could they be made of?
In pic 01 I could not remove all plaster, pic 02 is from the chimney breast.
Many thanks!
They look like breeze blocks but in black so cannot be made out of concrete (and are nowhere as firm). Just wondering what could they be made of?
In pic 01 I could not remove all plaster, pic 02 is from the chimney breast.
Many thanks!