Hi I always use a latex based self level compound on timber floors , it's flexible and contracts and expands with the floor without cracking , also before I pour this I brush on a 50/50 mix of diluted PVA glue , hope this helps Regards Craig Notts renovations
If it's not massively uneven then buy some fibre boards which are about 6 mm thick They are a better job,but like the other guys have said it might pay to buy self levelling compound but make sure your floor is dust free before you pour the leveller out on to floor or it will blow and crack, I hope this helps kind regards david
think about some self levelling compound, mix it up pour it on smoothit out anleave overnight , should have a level floor ,leave a few days to dry thouroghly and off you go
If the floor is concrete then you will need to use a self levelling compound to level out
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