My barn rebuild is approaching the point where I need to decide the order of laying the floor.
Ultimate finished floor level can be determined by allowing 6'6" below the bottom of the beams. However, advice in here, constructional guidance in books (oldish) and what our builders did varies.
Eg. in 1995 the builders method was compacted hard-core, dpm, 4" over site concrete, 2" polystyrene sheet and 2" floor screed.
My Collins DIY manual has compacted hard-core, dpm, insulation taped at joins (with what?) concrete and then screed.
I plan to use the building as a workshop initially and am concerned that shunting bits of heavy machinery around might damage a floor laid on insulation. Also, leaving the insulation to the future gives better options such as underfloor heating. Reducing thermal mass must be useful for rapid warm up but is there anything else to consider. Do building regs. specify a thickness of underfloor insulation, is this fixed or is this part of an overall calculation? Does insulation come in different load bearing qualities?
Once I know how the floor goes I can sort out damp course levels for the wall.
regards