"dennis@home" wrote in message
web.com...
On 14/06/2016 13:59, The Natural Philosopher wrote:
On 14/06/16 13:38, dennis@home wrote:
On 14/06/2016 12:05, The Natural Philosopher wrote:
On 14/06/16 11:56, dennis@home wrote:
On 14/06/2016 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?

Nowhere near what is lost through the roof and walls before
insulation.
I would guess at less than 10% before any insulation for a solid
floor.
With 25mm of insulation that will take it down to about 2% another
25mm
will take it down to about 1%. Unless the insulation is really cheap
and
labour free it will never pay for itself.

Confirming once again that Denise cant read a post before replying.

And has no understanding of heat loss in buildings or why its different
with UFH.

You really don't understand physics do you!

I do understand physics

If you put pipes onto and they are at 55C that will only about double
the heat loss through the floor and that loss is only the 1%

No, its noth8ng like as low as that

Of course it is,

Nope. It wouldnt be as low as 2% with 25mm of insulation.

just read what I said

That was always wrong.

and think about it.

Did that, you are wrong.