[Greenbuilding] Passive solar home--concrete overlay re thermal mass

[Peter Kidd]

Between different materials! Is it anyone's experience that simply 
layering materials achieves significant resistance to heat loss? (that's 
not the same as "wear layers") If that works we have a new world of 
compact insulation solutions ahead of us. The followup comment about 
tile or other "overlays" versus an intimately bonded new layer was about 
there being no air gap or other materials to add a little resistance in 
the latter case. And earth vs non-earth, that is a philosophical choice 
not an issue of "thermal mass". Am I correctly recalling that the 
original "slab" was two inches as well? It is seriously cracked, and you 
are wondering if adding a second relatively thin, apparently (also?) 
un-reinforced layer may cause problems. What is under the current 
concrete layer?


On 13-05-13 10:06 AM, Vadurro, Rob, EMNRD wrote:
>
> I believe the concern is the transfer of heat between different 
> materials. I can't remember where I saw it, but there was a table 
> showing the transferring heat between base and finish materials, say 
> tile to concrete slab below in passive solar conditions and the rate 
> of transfer was much less than one might think. The joint between the 
> two impeded the heat transfer, in other words. I would think an 
> acrylic additive may impede the transfer even more. The best is always 
> to not cover the slab, only color it, if heat retention in the slab is 
> the goal.
>
> Rob Vadurro, AIA
>
> Park Architect
>
> New Mexico State Parks
>
> 1220 South Saint Francis Drive
>
> Santa Fe, NM 87505
>
> 505-476-3383
>
> 505-476-3361 fax
>
> *From:*Greenbuilding 
> [mailto:greenbuilding-bounces at lists.bioenergylists.org] *On Behalf Of 
> *Topher
> *Sent:* Monday, May 13, 2013 8:39 AM
> *To:* Green Building
> *Subject:* Re: [Greenbuilding] Passive solar home--concrete overlay re 
> thermal mass
>
> On 5/13/2013 1:07 AM, KTOT (g) wrote:
>
>     Does anyone have experience or knowledge about this? Using or not
>     using a concrete overlay product for the top layer of a floor for
>     thermal mass, vs. a plain darkly stained concrete slab
>
>
> A concrete overlay product is likely to be roughly similar in thermal 
> characteristics to a concrete slab.  Meaning that you will just have a 
> thicker thermal mass.  It seems unlikely that you should be worried 
> about /too much/ thermal mass in a passive solar house.  The overlay 
> product might have a lower specific heat, or conductivity, wither of 
> which will reduce it's effectiveness somewhat.  Remember to stick with 
> a dark color.
>
> Thank You Kindly,
>
> Corwyn
>
> -- 
> Topher Belknap
> Green Fret Consulting
> Kermit didn't know the half of it...
> http://www.GreenFret.com/
> topher at greenfret.com  <mailto:topher at greenfret.com>
>
>
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