R15 Batts Between 2x4@16 Wall Joists, Joist Thermal Shorts.ods
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R15R15R15R15R15R15R15R15R5R1R0.4R0.004
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Full Contact1% Out Of Contact5% Out Of Contact10% Out Of Contact20% Out Of Contact30% Out Of Contact70% Out Of Contact100% Out Of ContactFull ContactFull ContactFull ContactFull Contact
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Percent Insulation Decrepitude015102030701000000
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Input Values
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No-Coverage R-Value000000000000
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Joists R-Value. 0.94 per inch3.33.33.33.33.33.33.33.33.33.33.33.3
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Batts R-Value1515151515151515510.100.10
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Area Fraction, Joists0.10.10.10.10.10.10.10.10.10.10.10.1
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Area Fraction, Missing Insulation00.0090.0450.090.180.270.630.90000
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Computed Area Fraction, Working Batts0.90.8910.8550.810.720.630.2700.90.90.90.9
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Computed U-Values
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Note: Each is 1/(R-value + 3)
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U Joists0.1590.1590.1590.1590.1590.1590.1590.1590.1590.1590.1590.159
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U missing insulation0.3330.3330.3330.3330.3330.3330.3330.3330.3330.3330.3330.333
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U batts0.0560.0560.0560.0560.0560.0560.0560.0560.1250.2500.3230.323
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Note: U eff is the sum of area fractions times computed U-values.
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U eff0.06590.06840.07840.09090.11590.14090.24090.31590.12840.24090.30620.3062
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Note: R eff = 1/U eff, minus 3.
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R eff12.1811.639.768.005.634.101.150.174.791.150.270.27
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Sim, up to three components:
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R1000000000000
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%100.94.59182763900000
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U10.0002.25011.25022.50045.00067.500157.500225.0000.0000.0000.0000.000
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R23.33.33.33.33.33.33.33.33.33.33.33.3
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%2101010101010101010101010
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U23.0303.0303.0303.0303.0303.0303.0303.0303.0303.0303.0303.030
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R31515151515151515510.40.004
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%39089.185.581726327090909090
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U36.0005.9405.7005.4004.8004.2001.8000.00018.00090.000225.00022500.000
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Sim U-Average0.0900.1120.2000.3090.5280.7471.6232.2800.2100.9302.280225.030
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Sim R-Average11.078.915.003.231.891.34.62.444.761.07.44.00
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