Dave

Any reason for wanting to apply a scratch coat.....if floor is out a bit then surely a latex leveller would be better.. very little increase in floor height and faster set time than scratch coating....seems alot of expense to go too......

1 : clean tiles..

2 : apply metal lath sheets...or similar..

3 : apply scratch coat.....10mm to 25mm

4: leave 48 hrs to tile....

Will easier to self level and tile next day....hope this helps...........dave...