Laying parquet Oak floor on uneven surface

[binstown]

I am laying a new oak parquet floor over the kitchen floor which is sloped at 1.5 to 2 inches deep. I need 1 inch only for the parquet.

The floor is moist.

Should i install a surface DPM and then use a self leveling water based compound ....

or do i need to

first put down a sand and cement base to level floor to 1.5 inch and then do the above?

Thanks!

 

[tall_tone]

Follow the manufacturers instructions.
A difference in level of 35-40mm is probably beyond most leveling compounds. Sand cement would be the best bet then as most levelling compounds are NOT moisture tolerant you should DPM and then level. Check for compatability between DPM and Leveling compound, many suggest a broadcast of fine sand on the second coat of DPM before leveling.
Regards
TT