Self levelling compound onto of existing screed self-levelling.

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Hi I have a floor that I am hoping to lay down some parquet flooring I am painstakingly in the process of cleaning block by block.

The floor where I want to lay it is a concrete slab with two layers (separated by a red member - might just be thick/gloss paint) of screed/self levelling compound.

The issue I have is that this top layer whilst smooth is neither flat nor level. It has dips and undulations in it. I am simply not going to risk laying the parquet on this.

I am going to use angle irons to establish parallel "tracks" on the floor that a level to each other. And then fill them in with self level (any other suggestions here?) compound and smooth it down the tracks using a straight edge - creating a smooth, flat and level surface.

Now there is quite a different between the highest point in the room and the lowest. maybe as great as an inch (it's a long rectangular room so it's not so shocking).

I was hoping to just remove the the existing self level at the high points in the room, and leave the existing stuff at the lower points - meaning I can use less self levelling and have less of the old surface to take to the skip.

Is this sensible, or should I just pull the whole lot up?
 
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