[Strawbale] straw clay insulation values

[Rob Tom]

On Wed, 02 May 2007 23:37:16 -0400, Daniel Priest <danielpriest at gmail.com>  
wrote:

> Anyone have any info on the insulation value of straw-clay?

Daniel;

The following values are from a chart in "Lehmbau-Handbuch"  by Gernot  
Minke.
If the table gets buggered-up by your email program or the List software,  
when reconstructed you should have five columns of values.

In the original chart, there are two columns of values, the first being  
for "density" and the second for conductivity, both in SIU (kg per cu  
metre  and Watts/metre-degree(Celsius) respectively.  The conversions for  
the corresponding Imperial units and R-value are mine.
(R-value = inverse of conductivity).

Below the chart of values are some empirical observations made by John  
Cruikshank (aka Sunny John).

				

Density		Conductivity		Resistivity	
SIU	Imperial	SIU	Imperial	Imperial	
kg/m^3	lbs/ft^3	W/mK	Btu*in/hr-ft^2	R-val per inch	

300	18.73	0.1	0.69	1.44	
400	25	0.12	0.83	1.20	
500	31	0.14	0.97	1.03	
600	37	0.17	1.18	0.85	
700	44	0.21	1.46	0.69	
800	50	0.25	1.73	0.58	
900	56	0.3	2.08	0.48	
1000	62	0.35	2.43	0.41	
1100	69	0.41	2.84	0.35	
1200	75	0.47	3.26	0.31
1300	81	0.53	3.68	0.27
1400	87	0.59	4.09	0.24
1500	94	0.65	4.51	0.22
1600	100	0.73	5.06	0.20
1700	106	0.81	5.62	0.18
1800	112	0.91	6.31	0.16
1900	119	1.01	7.00	0.14
2000	125	1.25	8.67	0.12
2100	131	1.4	9.71	0.10
				
straw just covered then lightly placed (ie ceiling insulation)  20 pcf				
straw coated to point where it is *just* covered then form tamped (normal  
wall) 40 pcf				
straw just covered, then same amount of additional clay slip added then  
form tamped (high mass wall) 70 pcf				



-- 
=== * ===
Rob Tom
Kanata, Ontario, Canada
< A r c h i L o g i c  at   C h a f f Y a h o o  dot  C a  >
(winnow the chaff from my edress in your reply)