levelling v uneven floor

[emmaf]

We have just moved into a 1930s house that has been extended to the hilt. In the main room it seems 3 rooms have been knocked into one, thus under the carpet there are very noticeable ridges where walls have been taken out. Our plan was to lay hardwood flooring in this room (9 x 6m) and into the kitchen (7x6m) but the flooring chap that came round said the ONLY way to level the floor is to use screed at £27/m2........The original floor is concrete and there is at least a 1cm difference in heights.....is multiple layers of screed the only option or is there a cheaper way of getting a flat floor ie wood/concrete base with screed on top????
thanks

 

[crazydaze]

You could batten the floor out and lay a new floor ontop, but screeding will be faster, easier and less expensive. It's very important that you check the sub floor for residual moisture before you commit to screeding the floor. If there is some residual moisture in the floor, it will be fairly straight forward to put a liquid DPM down before the screed. Alternatively, if there is damp or moisture, there are specialist underlay products that will allow airflow under the floor without the need for a liquid DPM i.e. Pergo Moisture Bloc Extreme.