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Some of us EuroBaleHeads are indeed aware of the test you mention
;-) . We talked about it with 'Murrican' David Eisenberg during the
last European gathering in Belgium as he was involved in that
particular testing. I understood that there was a considerable space
between the bales and the gypsum board and that he believes that
this air-space increases tremendously the convection that is common
in fibrous insulation materials. If I understood him correctly he
does not consider it a problem to put a bale tightly agains a panel
but strongly advices against an airspace between the bales and a
panel. <br>
<br>
Herbert, has any testing been done on your finished panels or is
'your' R value based on a theoretical accumulation of the different
matérials you use?<br>
<br>
Bye,<br>
André <br>
France<br>
<br>
<br>
===========================<br>
<blockquote cite="mid:op.vner3gvs4f5a3n@owner-b0bdc4ac6" type="cite">
<pre wrap="">This is the Note Below
I don't know if EuroBaleHeads are aware of the first set of thermal
resistance tests that were performed on SB wall panels at the Oak Ridge
National Laboratory (ORNL) back in the previous millennium which resulted
in alarmingly low thermal resistance values for the SB walls tested.
I forget what the actual test results were (something like R-10
ft^2*hr*degF/Btu (or RSI -1.76 m^2*degC/W in metric units) or less if I
recall correctly ? (Hoping someone will correct me with the actual number)
... but I do recall that it was lower than the thermal resistance of a
conventional wood-framed/fibre batt-insulated wall using skinny 2x4 (38 x
89 mm) studs.
I also remember that the reason for the disgustingly low thermal
resistance value of those first SB test wall panels was attributed to
their being clad with gypsum board sheathing rather than wet-applied
plaster and that since the board sheathing could not conform to the
irregular surface of the SB, allowed air movement to occur at the
cladding/SB interface so that thermal resistance-lowering convection
currents occurred within the SB wall.
I suspect that the identical process would occur when OSB is substituted
for gypsum board sheathing.
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