Effects different insulating materials have on heat transfer through exterior house walls
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Effects different insulating materials have on heat transfer through exterior house walls. Tim Doot and Sabin Gautam. Wall Detail. Thermal Resistance of wall components. Gypsum Sheathing - (13 mm) - 0.079 K·m 2 /W Gypsum Wallboard - (50 mm) - 0.085 K·m 2 /W

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Effects different insulating materials have on heat transfer through exterior house walls

Effects different insulating materials have on heat transfer through exterior house walls

Tim Doot and Sabin Gautam


Wall detail
Wall Detail through exterior house walls


Thermal resistance of wall components
Thermal Resistance of wall components through exterior house walls

  • Gypsum Sheathing - (13 mm) - 0.079 K·m2/W

  • Gypsum Wallboard - (50 mm) - 0.085 K·m2/W

  • Brick Veneer - (100 mm) - 0.66 K·m2/W

    Insulation materials

  • Fiberglass/cellulose insulation - (90 mm)- 11.2 K·m2/W

  • Mineral Wool insulation - (90 mm) - 10.85 K·m2/W

  • Sprayed foam insulation - (90 mm) - 15.75 -> 22.75 K·m2/W


Total heat transfer equation
Total heat transfer Equation through exterior house walls

  • Q = -A·(ΔT/Rtot)

  • Toutside = -7°C

  • Tinside = 20°C

  • Thermal Resistance (R) = L/K·A

  • Rtot = Rbrick + Rsheathing +Rinsulation +Rwallboard

  • Rtot = 0.66 K·m2/W + 0.079 K·m2/W + Rinsulation + 0.085 K·m2/W

  • Rinsulation (Fiberglass)= 12.024 K·m2/W

  • Rinsulation (Mineral Wool)=11.674 K·m2/W

  • Rinsulation (Sprayed Foam)=16.574 -> 23.574 K·m2/W


Heat transfer for different insulations
Heat transfer for different insulations through exterior house walls

  • Fiberglass/Cellulose

    • Q = 27 K/12.024 K·m2/W

    • Q = 2.25 W/m2

  • Mineral Wool

    • Q = 27 K/11.674 K·m2/W

    • Q = 2.31 W/m2

  • Sprayed Foam

    • Q = 27 K/(16.574 K·m2/W) –> 27/(23.574 K·m2/W)

    • Q = 1.63 -> 1.15 W/m2


Conclusions
Conclusions through exterior house walls

  • The calculations show that the sprayed foam insulation can be up to twice as effective as the fiberglass insulation in reducing heat transfer through an exterior house wall

  • It would be worth it to spend the extra 30% in costs to install the sprayed foam insulation and save on energy costs than to install the fiberglass insulation for a reduced initial cost


References
References through exterior house walls

  • http://www.gobrick.com/BIA/technotes/t28_files/image001.jpg

  • http://www.american-sprayfoam.com/residental

  • http://www.fao.org/docrep/006/y5013e/y5013e08.htm


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