I need to raise the floor level of an area about 2.5 by 1.5 metres which is a covered area between the back door and the outside toilet and store which have the same floor height as the kitchen
The base is slabs on hardcore which have been in place for 60+ years and are flat and level
The area has been enclosed for years with wooden frames and doors and windows which I have removed
The infill will be 125 mm total
My plan is 100mm concrete on top of dpm laid on the slabs
construct new frames from 75 x 50 studding on top of this and enclose
Finish with 25 mm of screed to get finished level
from what I have read the screeding wont be easy but it is only a small area and dead flat is not necessary
I am looking at 4.5 sharp sand to 1 cement and a fairly dry mix ( it has been some 25 years since I last did any screed so any tips appreciated)
Does this sound ok or should I reduce the concrete thickness and increase the screed thickness?
Regards