[Greenbuilding] cardboard r-value
ArchiLogic at yahoo.ca
Tue Sep 8 16:00:10 CDT 2009
On Tue, 08 Sep 2009 13:59:36 -0400, Benjamin Pratt <prattb at uwstout.edu>
> Looking for the insulation value (r-value) of ...corrugated paperboard.
When looking for the properties of materials (ie vapour permeance,
densities, thermal conductivity/resistivity etc.) chances are pretty good
that the ASHRAE Handbook of Fundamentals (found in any university library)
will have them listed. It has values for both cardboard and pumice.
But a quick Google for "Thermal properties corrugated cardboard" yielded
the following hit
and on page 5 (looking at the HTML version of the above document)
"Table 2: Physical properties for corrugated cardboard
Property Value and Reference
k 0.064 W/m·K  "
Converting the above to Murrican units, 0.44 Btu*inch/hr*ft^2*degF
and converting the latter to R-value, R-2.25 per inch thickness
or for the "about 3/16 inch or .5 cm" thickness mentioned by Ben, R-0.42.
Obviously, the R-value of the cardboard being negligible, will do very
little to enhance thermal comfort of an occupant of a cardboard shelter. I
suspect that its primary benefit is to provide some shelter from
=== * ===
Kanata, Ontario, Canada
< A r c h i L o g i c at ChaffY a h o o dot C a >
(manually winnow the chaff from my edress in your reply)
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