Fixing sloping floor with cut insulation board

TomThumb123

The concrete floor in my dining area slopes fairly significantly to one end, about a 120mm drop over maybe 3.5 meters. I was thinking that instead of pouring more concrete or self-levelling compound I could lay some rigid foam insulation board cut at an angle so the final surface is level, then install wooden flooring on top of the insulation. Can anyone think of any reason why this wouldn't work?

Thanks very much!

debtdebt

You’ll never get a completely level run and the insulation board will compress and /or collapse leaving you with an unsound base and the wood flooring failing at the joins.

Just get the job done properly.

TomThumb123

Thanks for your advice. Sorry to be persistent but do you think it would work if I installed a timber frame to level and support the floor and then just filled the spaces in between frame members with insulation foam?

-taff

You'd have to be very very good at cutting shallow angles to compensate for a drop over 3.5 metres.


It wil be much much easier to get some self levelling compound. The floor is conrete?

Andy123.

Why would you use self levelling compound when it drops off by 5 inches???

naf123

self levelling is expensive. Maybe mix up concrete (cheap!) as a base with a finishing touch of self levelling compound screeding

pmartin86

Id be more concerned at why the floor has "dropped" 120mm on one side :O

TomThumb123

Thanks for advice all.

Pmartin - Floor has dropped due to historical subsidence. Not something to worry about according to the building survey I had done when I bought the place :-/. Maybe an argument for not putting a load more concrete down though...

Also, I've read than concrete takes several weeks to dry before you can walk on it, obviously it wouldn't be ideal to not be able to use that room for so long. Am I right to worry about this or can you get quicker drying stuff?