On Wed, 07 Jan 2009 00:51:47 +0000, Tim S wrote:

If we assume:

a) the ground is 5C mean in winter (seems to be bourne out by a rough slab
surface measuremment I took last week),

b) The ground is an infinite heatsink (worst case, but largely ********, but
I don't have data to do better)

There's a 'standard' U value for solid floors of 0.36 from BS5449(1990)



--
John Stumbles -- http://yaph.co.uk

I used to think the brain was the most interesting part of the body
- until I realised what was telling me that