On 14/06/16 11:04, Tim Lamb wrote:
Underfloor heating.

Insulation thoughts... the existing ground floor has 25mm Jablite topped
with 22mm chip. Recommendation is to over fit 25mm of pre-grooved
insulation and a further set of flooring: chip + Vinyl or engineered
hardwood.

Downside is loss of height in doorways.

What is the real energy loss in heating a relatively uninsulated floor
slab in a roughly square building? For 24 hour occupation, doesn't it
come down to what is lost at the edges?


Mm. Its a very very complicated calculation as you have to take the mean
path through a variable soil conductivity to the outside air.

And it isn't dominated by edge effects at all.

Plus remember that the hotter the floor is in comparison to the room the
worse will be the heat loss through it.

Don't think 25mm poly is anywhere near enough.

You must have that extra 25mm, and even then Id say its gonna be lossy.



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