Convert back to garage to utility - insulation thickness

10 May 2011
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West Midlands
United Kingdom
After a couple of years thinking about adding a conservatory, I think I have finally worked where to put it! Part of the plan is to convert the back of the garage to an utility room. The wall is single skin brick, with uninsulated flat roof, and concrete floor.

What is the thinnest insulation that can be used to bring insulation up to current values?

A stud wall will need to be put in between the utility and garage, what type/thickness insulation is required.

The floor needs to be raised by around 18cm - therefore a suspended timber floor can be put in. What is the best way to provide insulation, or would it be better to put in a insulated concrete floor.
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