Building screed up.

If you wanted to build screed up say to about 25mm how would you go about it to keep cost down and to make it dry quick.
Would you use granno to build up a bag an bottle or maybe a couple coats of 300?

 

Stopgap have a screed called 600 that you can use. Ive used na with aggregate in the past

 

Uzin do one which you cove the whole floor in 25mm pea shingle then you just keep pouring the screed all over the shingle until its disapeared or only just poking through then a final top coat not the quickest process but does work very well.