[Greenbuilding] R-value of crushed stone under slab

[RT]

So, like, AA-man;

Clearly the universe desires to conceal anything having to do with the  
letter "R" from you (noting the "R" that is missing from "No(r)bert's"  
name and in the "A(r)chitecture and Education " in your sigfile and the  
R-value of gravel in your search engine's capabilities and in your  
tattered copy of something-or-t'other.

I just happened to have an inch-pound version of the 1985 ASHRAE Handbook  
of Fundamentals  in my hand and in  23.8  Table 3A, for "Sand and gravel  
or stone aggregate of 140 pcf density" it lists its thermal resistivity  
(ie  R-value per inch thickness) as being:

                   (oven dried)  0.11     and   (not dried)   0.08    in  
units of   h*ft^2*degF/Btu

To convert from Murrican units to SIU, mulitply by 6.934 to convert to    
m*degC/W  (reduced from ( m^2 * degC) / (W*m) )


Me ? I'd be inclined to take maybe 18" of that 24" of crushed stone and  
bring it inside of the thermal envelope where one can take advantage of  
its thermal mass.  It'd only increase the load on top of the foam by less  
than 1.5 psi  ... peanuts eh ?


On Mon, 07 Dec 2015 19:02:15 -0500, Alan Abrams  
<alan at abramsdesignbuild.com> wrote:

> Nobert--
>
> my "look-up" skills may admittedly be deficient, but I could not find

>
>> HELICON WORKS Achitecture and Education
>
> On Mon, Dec 7, 2015 at 5:26 PM, Norbert Senf <norbert.senf at gmail.com>  
> wrote:R-value of gravel is a look-up value............N
>



-- 
=== * ===
Rob Tom T6015O
Kanata, Ontario, Canada

< A r c h i L o g i c at Y a h o o dot C a >

(manually winnow the chaff from my edress if you hit "Reply")
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