How to raise sloping garage floor

Joined
2 Jan 2015
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Location
Cheshire
Country
United Kingdom
Hi everyone,

I need to raise a garage floor that is sloping. The floor currently is concrete and I want to build up with insulation boards and then concrete screed.
Lowest end needs to be raised 180mm and shallow end by 125mm. What is the best thickness boards and screed to achieve this?
Do I level the existing floor first or can I lay say 100mm thick boards on the slope and just make level with screed?
Many thanks
 
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