R19 Batts Between 2x6@24 Floor Joists, Joist Thermal Shorts.ods
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ABCDEFGHIJKLMNOPQRSTUVWXYZ
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R19R19R19R19R19R19R38R38R38
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100% Contact100% Contact95% Contact90% Contact85% Contact80% Contact
100% Contact
90% Contact80% Contact
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Input ValuesBad HatchNo Hatch
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Batts R-Value191919191919383838
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Joists R-Value. 0.94 per inch5.25.25.25.25.25.25.25.25.2
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No-Coverage R-Value000000000
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Area Fraction, Joists0.0650.0650.0650.0650.0650.0650.0650.0650.065
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Area Fraction, Missing Insulation000.050.10.150.200.10.2
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Area Fraction, Hatch0.0050
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Computed Area Fraction
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Area Fraction, Working Batts0.930.9350.8850.8350.7850.7350.9350.8350.735
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Computed U-Values
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Note: Each is 1/(R-value + 3)
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U batts0.0450.0450.0450.0450.0450.0450.0240.0240.024
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U Joists0.1220.1220.1220.1220.1220.1220.1220.1220.122
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U missing insulation0.3330.3330.3330.3330.3330.3330.3330.3330.333
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U hatch0.3330.3330.3330.3330.3330.3330.3330.3330.333
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Note: UA Sum is the sum of area fractions times computed U-values.
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UA Sum0.05190.05040.06480.07920.09360.10800.03070.06160.0925
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Note: R eff = 1/U eff, minus 3.
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R eff16.2816.8312.439.627.686.2629.5413.237.81
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Sim, up to three components:
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R1000000000
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%10.50510152001020
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U11.2500.00012.50025.00037.50050.0000.00025.00050.000
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R25.25.25.25.25.25.25.25.25.2
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%26.56.56.56.56.56.56.56.56.5
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U21.2501.2501.2501.2501.2501.2501.2501.2501.250
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R3191919191919383838
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%39393.588.583.578.573.593.583.573.5
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U34.8954.9214.6584.3954.1323.8682.4612.1971.934
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Sim U-Average0.0740.0620.1840.3060.4290.5510.0370.2840.532
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Sim R-Average13.5216.205.433.262.331.8126.953.521.88
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Ri%Ui
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00.51.250R-Average
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13.52
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5.26.51.250
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U-Average
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19934.8950.074
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