[Greenbuilding] R-value of crushed stone under slab

[Frank Tettemer]

I would consider the 24" of gravel as a steady, 24/7 heat loss.  In 
fact, in a colder climate, (like Eastern Ontario, Canada), there would 
be little consideration of trying to heat that gravel. Any heat going 
into it from the house would continue traveling down and out, and the 
heat added to the stone would never return to the house. Unless you 
opened all the windowsand doors to quickly chill the place. Then for a 
short while, the cool stones would give offtheir relative heat to the room.

In other words, dee-coupling from the stones, with at least R-25 
insulation, would be a Good Idea.  If you were a Passiv Haus enthusiast, 
you would insulate with R-45 or more, to prevent heat loss to those stones.

Frank Tettemer
Living Sol ~ Building and Design
www.livingsol.com
613 756 3884




On 07/12/2015 5:26 PM, Norbert Senf wrote:
> Right, I was only addressing the "heat capacity expressed as MJ(m^3K)" 
> part of the question. R value of gravel is a look-up value............N
>
>
> On Mon, Dec 7, 2015 at 2:42 PM, Nick Pine <nick_pine at verizon.net 
> <mailto:nick_pine at verizon.net>> wrote:
>
>
>     Norbert Senf <norbert.senf at gmail.com
>     <mailto:norbert.senf at gmail.com>> writes:
>
>         ... the specific heat would be .14 MJ/m3-K
>
>
>     I'm afraid that has nothing to do with R-value.
>
>     Nick
>
>
>
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> -- 
> Norbert Senf
> Masonry Stove Builders
> 25 Brouse Road, RR 5
> Shawville Québec J0X 2Y0
> 819.647.5092
> www.heatkit.com <http://www.heatkit.com>
>
>
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