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!
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% so at best
adding another 25 mm will take it to the same level as a normal room
without UFH.

Just for the understanding.. if you double the temperature difference
you double the loss. If you double the insulation you halve the loss.


And this is the calibre of mind that thinks staying in the EU is the
right thing to do.

For him it probably is. Unable to think coherently for himself, and must
always buy 'microwave ready' pre-cooked opinion from the Guardian...

Whats the Guardian? ;-)