"Andy Hall" wrote in message
...
On Sun, 4 Jan 2004 15:22:15 -0000, "John Stumbles"
] wrote:

Anybody got any figures for these (and ideally pointers to sources of
such
figures)? I can't find them in Part L or BS5449(1990). The BS has values
for
floors with Bare boards and "Parquet, lino, rubber" (rubber?!): I
wouldn't
have expected them to have laminate in 1990, but I'm sure we had carpets
even back in those days!

There are tables in the help files of the Myson and the Barlo heatloss
calculating software. If you want the Myson one (their web site is
under construction) I can mail it to you.

Yes please; I thought I had a copy somewhere but can't find it now I need it
:-(

The Barlo one's tables seem to be cribbed straight from the BS.

There is also a good table and sets of numbers the HVCA Central
Heating Design Guide.

"Domestic Heating Design Guide", £20, treeware perhaps?

For the roof, the main factor is going to be the amount of insulation.

Figures I have are 2.04 for uninsulated, 0.80 for 25mm and 0.54 for
50mm. Probably after that, the figure is going to tend towards the
U value of the insulation and the rest becomes almost irrelevant.

I'd expect it to have 100mm glass fibre but I'd need to ask the guy who put
it up. I'll shoot for 0.5 which should be close enough for jazz.


For the floor, you have to take into account the perimeter/area factor
if it is a ground floor so there are tables of numbers rather than
single figures.

The BS just has a couple of fudge factors for different floor areas of solid
floors (reflected in Barlo's 110sqm, 50sqm and Terraced house options).



--
John Stumbles
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Thank God I'm an atheist