In article ,
sm_jamieson writes:
Forget the term breeze block - it means different things to different
people.

Real breeze blocks haven't been used since 1920-1930's.
Both breeze blocks and clinker blocks which replaced them can leach
out nasty chemicals when they get wet. Breeze eventually fall to
bits if kept wet (depends what particular chemical process ash/effluent
was used to make them, and how much soluable material was present).

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]