I am using HERF so a 2mm is allowed. But the entrance has a gradient due to tiles in living room and HERF in bedrooms. So i order to level it, I was told to hack the old cement screed (10 yrs old) and then lay the normal cement and self-leveling cement before using HERF. My contractor actually said if I can find a cheaper quote then let others do but he used to quote us $1080 for 432sqft then $1512 for normal cement screeding cos of his miscalculation though we signed a contract so out of good will we help him . Then now, he said $2,000. So just want to get a quote. But we already signed contract with him