Insulating a garage floor conversion

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Hi All,

I am converting my garage into a living space (permitted development).

The current floor is an un-insulated concrete slab with a 2" slope

My current plan is as follows:

Damp proof membrane directly on the slab.
Then 50mm foil backed Celotex.
Then a screed to level the floor, 1" at thinnest to 3" at thickest point.
Then 1" battens and 1" Celotex
Then floor boards

I understand that regs call for 1200mm of celotex but their is no way I can raise the floor that much.I have seen multifoil but this is controversial in its effectiveness and also needs an air gap on either side so I will not save muck space. Another option is foil bubble insulation.

Any thoughts and advise would be greatly appreciated.

NB: This conversion is out of necessity as I need to rent out my bedroom if I am to be able to pay the mortgage (thankyou con-dems!). I would like to build to reg's but cant afford to meet them in all areas so the main concern is finding a middle ground between installation costs and running costs while maximizing the final space. I am an amateur and will do as much of the work as possible myself.

Thanks,

Andy
 
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Can't really help with the conversion but trying to flout or 'bend' the building regs could turn out to be much more expensive than it is to adhere to them.

Problems could come back to bite your back side if you can't keep up the mortgage and have to sell or the house is repossessed. New buyers will want to see the paperwork for the conversion and if its not up to spec they may well pull out of the sale.
 
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I am not making any structural changes and the garage is fully detached. I do not see how having an insulated garage will be seen as worse that having an un-insulated garage! It can only be a positive. Keeping the garage doors etc (insulating them though!)

If it did cause a problem at sale I could return it to it's original state within a day.
 
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