Afternoon, Looking for some advice with regards leveling a garage floor out. Initially was due to start last summer however delayed until this summer. We have however in the mean time found out we are due a child in July. This has brought the project forward. Originally was due to put a DPM,130mm TF70 then screed to bring it up to FFL. However due to drying time on the screed this isn’t going to work for us. The floor level goes from 155mm to 260mm across 4m. Was wondering if anyone had used the following method; DPM, tapered firrings set at 400mm centres with sharp sand in between, 130mm TF70 kingspan then 22mm weyrock. Not sure if this will suffice because of the timbers or the sharp sand? Any advice is appreciated. TIA.