RE: Re: Zoned Heating Control

["Neil Ball" <neilball@xxxxxxxxxxxxxxx>]

Anhydrous screeds such as Gylon & Superflo are not suitable for
use as the
wearing surface according to their respective datasheets so some kind of
floor covering will be required. In the 7 months since my screed went down
it has worn quite a bit where it was unprotected. I'd suggest speaking to
your Gylon/Superflo rep to see if there is any way of finishing the screed
as a finished floor surface in a domestic situation.



You can glue the flooring to the screed as long as you leave the expansion
gap which can be filled with cork strips or sealant. I've supplied controls
in many homes where wooden flooring is installed over underfloor heating,
both fully floating and bonded to the screed. In either case the system
works very well. I'm putting some laminate & engineered wood fully
floating
in a number of rooms and have no worries about this at all.



If you fit tiles you should also leave a 5mm expansion gap at room edges
and
within doorways according to the BAL adhesives guidelines - I've just
completed 120 m2 at the new house and followed the guidelines to the letter
as I've been paranoid about the tiles staying stuck!



I would not be worrying about the flood, if the worst happens it is likely
to cause damage regardless unless you tank the floor/walls and install
drains, in essence making each room a wet room.



Neil B.





_____

From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf Of
Chris Hunter
Sent: 29 April 2007 09:49
To: ukha_d@xxxxxxx
Subject: Re: [ukha_d] Re: Zoned Heating Control



Richard -

thanks ... interesting ...

rather than temperature gradient, I guess it'll be rate of heat
supply, that would be the constant, for a given room, with a higher
temperature gradient between UFH pipe & air in the room being needed
to drive the heat through if there's more resistance, because of
carpet or underlay, say ... and the higher temperature in the pipes
that that would need would lead to some loss of efficiency, thanks to
greater heat losses upstream from the UFH and basic thermodynamics
(small temperature differences being more efficient in any
thermodynamic / heat-cycle, IIRC) ...

'must say, I'm edgy about loose-floating the wooden covering &
leaving a gap at the edge .... noise issues & what happens if there's
a flood ! Plus, we intend not having skirting boards !

when we started our build, we had floor-grade hardboard on our list
of options ... didn't sound a good idea, until I got a sample of the
material ... it's still an option (suitably sealed) !

'wonder if it would be possible to leave the screed (anhydrous)
uncovered ('might have to be sealed, I guess) ... or if an epoxy
paint could be good ??

if it was up to me, I think I'd go for welded linoleum, but 'wife
wants wood !

Chris





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