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

[John Salmen]

The bonding of a tile or dissimilar material to a concrete slab usually
requires a separation or slip sheet of some sort as well as a trowel pattern
that will create air pockets. This is different that simply a concrete
resurfacing material. Resurfacing is typically a very finely graded cement
product with modifiers to allow for bonding and movement. The density of
these materials would be typically high possibly exceeding the concrete
slab. I can't see an issue that would involve removing a slab unless it is
totally f_____ for other reasons.

 

From: Greenbuilding [mailto:greenbuilding-bounces at lists.bioenergylists.org]
On Behalf Of Vadurro, Rob, EMNRD
Sent: May-13-13 8:07 AM
To: topher at greenfret.com; Green Building
Subject: Re: [Greenbuilding] Passive solar home--concrete overlay re thermal
mass

 

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
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