Building Elements - Heat Loss and Thermal Resistivity

Thermal resistance in common building elements as walls, floors and roofs above and below the ground

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The thermal resistance in some common building elements can be found in the table below. The values can be used to calculate Heat Loss from Buildings.

Thermal Resistance Inside and Outside Walls Resistivity (m2K/W)
Ri = 1/fi 1) Ro = 1/fo 1) Ri+ Ro
Building parts against the surrounding environment 0.13 0.04 0.17
Building parts others 0.13 0.13 0.26

building heat loss through ground

Thermal Resistance for Building Elements against Earth Resistivity (m2K/W)
Re
Floors 0.5 m above to 0.5 below earth bound, 0-1 m from inside outside wall - without cold bridge protection 0.2
Floors 0.5 m above to 0.5 below earth bound - with cold bridge protection 1.0
Centerfield above 1 m from inside outside wall 1.5
Basement floors 0.5 m below earth bound 2.0
Basement walls under earth bound, the whole wall against the earth, where h is the basement floors level below the earth bound (m) 0.2 + 0.3 h
Basement walls under earth bound, basement floor against the earth and partly against air 2.0

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  • Insulation - Heat transfer and heat loss from buildings and technical applications - insulation methods and coefficients to reduce energy consumption

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