Dear Chris,

Thanks for the very useful information in your message.

On 15 Jun, 14:24, Chris George wrote:
I now know it is on the first floor
I assume as you dont say otherwise that the two side walls are level
with each other. Ipso facto any "subsidence" is on and partition wall
in the midspan on the floor below - which is not uncommon if plonkers
take them out or more likely they are not so well founded as the
perimeter walls or worse still not founded at all but resting on floor
boards of the GF!

I'm not sure I have to check that. There are two floors below mine and
I know that the floor below has the same partition wall as mine. I'm
not sure about the lower ground flat, as I have never been there.
Could the house be in danger?

If you are putting on sheet material then you can cross
batten much much quicker but make sure it is done at good centres and
that you have them accurately marked on the skirtings or you wil have
a hellofajob in nailing down!

I was planning to batten above the joists and place the sheets on top
of the battens (i think this would be quicker).

I deal with listed buildings all the time and such floors are not
allowed to be levelled without consent as it is all part of the rich
tapestry of history of the building so think about whether you
actually need a floor to be straight!

My building is not listed and not in a conservation area either. To be
honest with you, I'd love to keep the original boards and I don't mind
the slope. However, the original boards are in a very bad state and
have big gaps - I have restored old boards in the past, and these are
the worst I have seen. I'm not keen on carpet either. This is the
first reason. The second one is that I had to level other parts of the
flat: the kitchen, utility room and bathroom had to be levelled before
installation. This created a "step" down the hall and living area.
Even if I were to put carpet on top of the existing floor, I couldn't
avoid the step and new wood flooring wouldn't go well with the slope,
so I can't see an alternative!

Marcos