Floor screed

[Leader]

That primer will be fine once you’ve removed the failed levelling compound completely. If laid correctly Renovation screed does not need any further work to tile to. With a porcelain tile you won’t need to decouple although it’s never a ‘bad’ thing to do with tiles this size, but unnecessary in this case.
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No need for one then.

No need for one then.

Cheers for the help Lee i tend to always put a expansion gap in if its over 5sq meters or more in each direction. I dont tend to do really big flooring jobs as i have been working for less than18mths as a tiler and still learning i mainly concentrate on smaller jobs until im 110% confident i can carry out the work to a high standard plus i dont have the speed of others as i like to make sure its correct.