Have been replacing 1930s floorboards and discovered that a partition
wall made of breezeblock has been built directly on top of the old
boards - probably in the 80s when a lot of bodging was done. This is in
an upstairs bedroom. Before now I've successfully tucked the new board
under any other walls as they've been safely built off joists but I'm
worried there wont be enough of the old board to bear this 'orrible
wall's weight. The wall is in the right place so don't want to knock it
down if poss.



80's is too late for genuine breezeblock, perhaps it is lightweight
blocks which helps a bit. (But it may be standard medium density
concrete blocks). Is the floorboard parallel to the wall, or
perpendicular? If perpendicular, you should be OK doing one at a time.
If parallel, can you just extract sections over each joist (Bosch
multitool?) and replace them a bit at a time?[/quote]

The floorboard is parallel to the wall so your suggestion to replace individual sections between joists is very welcome. Thanks