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  1.  
    Posted By: cbatjesmond
    Well if I don't report back on temperature differences between Kitchen and Sitting Room before the end of January 2009: Fear the worst! :-)
    ...
    Mmmm not sure I'll remember to come back (or even still be around!) in December 2013. I will report back to this thread if anything crops up soon.


    Well nothing's cropped up: I'm late but not fatally so: I'm starting to fit the bookcases that are the main furniture in the room. I hope that the SpaceTherm will support the weight of the books!

    As to temperature, I'm disappointed with myself for not recording outside and room air temperature as well as floor temperature at all stages of the installation: bare boards, SpaceTherm+ply, SpaceTherm+ply+vinyl. All I can really do now is compare floor temperature in different rooms at the same time. It would have been nice to compare outside/floor/air temperatures across a range of conditions.

    Anyway in unheated rooms, the floor with SpaceTherm is 1C warmer than than the kitchen (vinyl on ply on boards) and 1-2C warmer than the dining room (bare boards only). I would have liked a larger difference, but I hope it will make more difference when I get heating back on in the room. So it's not the one-step PassivHaus silver bullet I dream of :-/

    I will be laying the rest of the ST I have in the dining room next and will *think* about using it if/when the hallway gets rebuilt.

    Hope this helps.

    Best wishes
    -- CB
    • CommentAuthorspinkox
    • CommentTimeFeb 7th 2009
     
    <blockquote><cite>Posted By: cbatjesmond</cite>Anyway in unheated rooms, the floor with SpaceTherm is 1C warmer than than the kitchen (vinyl on ply on boards) and 1-2C warmer than the dining room (bare boards only). I would have liked a larger difference, but I hope it will make more difference when I get heating back on in the room.</blockquote>

    The thing is - THEY say only 15% of heat loss from a room is through the floor so even if you had 10 layers of Spacetherm it would not make significant difference to the temperature . . .

    steve
  2.  
    Posted By: spinkoxThe thing is - THEY say only 15% of heat loss from a room is through the floor so even if you had 10 layers of Spacetherm it would not make significant difference to the temperature . . .

    But surely that's THEIR floor: MY floor's different! :-) Anyway, it is/was an experiment I was in a position to try.

    Having just found the u-value calculator at http://www.vesma.com/tutorial/uvalue01/uvalue01.htm I estimate[*] that the u-value of the floor has changed from 2.69 (25mm floorboards) to 0.90 (vinyl, plywood, SpaceTherm, floorboards). Without the SpaceTherm it would have been about 1.94. So it's an improvement: more would be nice but within my constraints (max. 22mm rise in floor level, not pulling-up/climbing-under floorboards), I'm not sure I could have done better.

    A rough calculation assuming 15C temperature difference between inside and outside, ignoring internal walls & ceiling:
    oldfloor wall newfloor
    area 25m^2 15m^2 25m^2
    u-value 2.69 1.40 0.90
    W 1009 315 337

    So for MY floor in THAT room, I'm still losing more heat through the floor than the wall ... but only 1/3 of what I was.

    * The calculator doesn't have SpaceTherm in its list, so I used isocyanurate (resistivity 0.020 W/mK) and multiplied the thickness by 33% to represent SpaceTherm's 0.014-0.013 W/mK.

    The calculator doesn't have numbers on bookcases either: anyone know the thermal resistivity of bookcases? 11m^2 of bookcases against the walls has got to count for something :-)

    Best wishes
    -- CB
    • CommentAuthorspinkox
    • CommentTimeFeb 12th 2009
     
    I suppose - that well known diagram THEY provide that shows percentage heat loss from a property applies to a whole house rather than just one room. It would only apply perfectly to your situation if you had a one room house. Or taking it to the other extreme - if your room was surrounded by heated rooms where there was no temperature difference between them - then you would lose more through the floor! - I think. . .

    steve
    • CommentAuthorJackyR
    • CommentTimeFeb 12th 2009
     
    Using "typical house" percentages is hopeless. This may be "15% in a house with no loft insulation". As soon as you sort out the loft and drafts, the percentage loss through the floor will shoot up - while remaining exactly the same.
    • CommentAuthormellie_man
    • CommentTimeMar 30th 2009
     
    I have been tryig to use the U value calculator
    What humidity do you use!
    I was trying to see U value for 10mm TO10kingspan onto a 15" stone/brick solid wall. I f I put anyway near approaching Regs it indicated condensation rick with the default humidities.

    ?
  3.  
    Posted By: mellie_manWhat humidity do you use!

    I left RH at the defaults, but changed inside/outside temperatures to be more realistic worst-case for me: 18/0C

    Since the calculator is done in JavaScript, you could try a different browser ... FireFox instead of IE ?
  4.  
    This stuff any good for an attic conversion? Or cheaper alternatives?
    • CommentAuthorShevek
    • CommentTimeJul 29th 2014 edited
     
    Posted By: VictorianecoThis stuff any good for an attic conversion? Or cheaper alternatives?

    Too expensive. I'd recommend sprayed/blown insulations such as Icynene or Warmcel. Both are breathable and both also deal well with airtightness. We're spending about £2000 to insulate our loft conversion with Icynene to a thickness of 270 mm.
  5.  
    £2000 to insulate a loft?? Jeez lol
    • CommentAuthorShevek
    • CommentTimeJul 29th 2014
     
    You'd probably add another zero to achieve same u-value in Aerogel.
  6.  
    Posted By: ShevekYou'd probably add another zero to achieve same u-value in Aerogel.

    Aye, the details are dimming, but I see, to remember paying just over £1000 in 2008 for 50m^2 of 9mm SpaceTherm blanket (18 x 2.4m x 1.2m x 9mm). I could have got the same result for about £100 then (£200-300? now) of PUR or mineral wool -- if I'd had 200mm to play with instead of 20mm.

    5 year update: The SpaceTherm just sits there supporting 9' high bookcases. The room is warmer than comparable rooms without -- but it's S-facing and better heated so hard to compare. I've still to lay the remaining 25m^2 of SpaceTherm. I'm now intending to pull up enough floorboards in the dining room to get under the whole of the ground floor and insulate with 200mm of from underneath to get the theoretical u-value down to ~0.15 before relaying the dining room floor. I also intend (after 5 years reading here) to take a lot more care with draught exclusion!
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