Insulating a concrete floor for an office floating or joists ?

[mdnorth]

Hello

I am converting part of my detached garage into an insulated office, it has a concrete floor, I have put a 1000 dpm on the slab, and have been told to use 100mm of insulation on the floor which is roughly 4m squared. I have then been advised to either use floating floor 100mm of polystyrene and 8'x2' interlocking 22mm boards ?? Or joists 4"x2" at 16" centres with 100mm polystyrene in the gaps with 18mm boards on top. There does appear to be a significant cost advantage in the floating approach however are joists better ??? Many thanks

 

[endecotp]

With joists you can support more weight and have things like kitchen units that are fixed to the floor.
No joists and a floating floor should be easier and cheaper and be warmer.
Your choice really.
There are better-insulating materials than polystyrene, though they may cost a bit more.
See e.g. page 5 of http://www.kingspaninsulation.co.uk...22-97bb-5861799ab02a/Thermafloor-TF70-pdf.pdf

 

[mdnorth]

That's great nothing too heavy desk and a couple of chairs thanks for the reply