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Insulation
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ThermalAdmittance
(W/m
2
K)theabilityofamaterialtoexchangeheatwiththeinternalspacedue
toachangeintemperatureoveraperiodoftime(usually24hours).
measuredinW/m2 K
(temperatureisthedifferencebetweenthemeanvalueandactual
valuewithinthespaceataspecificpointintime)
It s g or eavywe g tconstruct on,an ow or nsu at on
ThermalAdmittanceisinfluencedby:
Thermalcapacity
Conductivity
Density
Surfaceresistance
heattransferfromthematerialssurfacetotheadjacentair though
thiscanbeincreasedthroughventilationprovidingconvectiveheat
transfer.
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InsulationEnvelope Heat Flow:
TheRvalue=resistancetoheatflow.Resistance (R Values)
Superinsulate, Build Tight, Ventilate RightResidential
Insulationzones
R-3R-6
R-5
R-5
R-5
R-5
R-4R-4 R-4
R-3
R-2
-R-3
R-2R-2
R-2
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InsulationResidential InsulationRecommendations(R Values)
R-values are given in units of ft F x h /btu
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InsulationR Values (U-factor or coefficient of heat
transmission)
NonResidential
nsu a onzones
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InsulationNonResidentialInsulationRecommendations
(RValues)
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Resistancevaluesof
InsulationTypeR perinch
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InsulationU Values (U-factor or coefficient of heat
transmission)
a measure of the flow of heat through an insulating or
building
material: the lower the U-value, the better the insulating
ability.
expressed in units of Btu/hr- sq ft F.
quoted for windows and doors.To reduce U-factors, manufacturers
apply a low-emitance coating to glazing surfaces
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InsulationU Values (U-factor or coefficient of heat
In the US, values are normally given forASHRAE winter conditions
of
0F outdoor temperature
indoor temperature15 mph windno solar load
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Resistanceofselectedinsulationtypes
R-23 SSIC Wall Section
Cascadia Prototype House, ESBL
R-34 Straw Bale Wall Section
Guest House, Sonoita, AZ, Bill Cook
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SeasonalInsulation
nsu at ngw t water:snow
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Moveableinsulation
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Ni htinsulationinsolarhouses
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BreathableinsulationRoof
battens and counter battens
bitumen impregnated fiberboard
9/16 plasterboard
Interlocking clay pantiles
8 cellulose insulation
Walls
1 vertical timber board and batt
Vapor control sheathing
cladding on battens and counterbattens
Breather paper
bitumen impregnatedfiberboard
8 cellulose insulation
1/8 medium board sheathing
9/16 plasterboard
