Building width [m]
Building length [m]
Building area [m2]
Building perimeter [m]
Depth of basement floor below ground level, Z  [m]
Wall thickness [m]
Wall insulation thickness [mm]
Insulation lambda (thermal conductivity) [W/(m K)]
Wall, thermal resistance [m2 K/W]
Floor insulation thickness [mm]
Insulation lambda (thermal conductivity) [W/(m K)]
Floor, thermal resistance [m2 K/W]
Type of ground	Unknown clay or silt sand or gravel homogeneous rock

 

  Wall U-value [W/(m2 K)] 0

  Floor U-value [W/(m2 K)] 0


- for a complete building, P is the total perimeter of the building and A is its total ground floor area. - to calculte the heat loss from part of a building (e.g. for each individual dwelling in row of terraced houses), P includes the lengths of external walls separating the heated space from the external environment and excludes the lengths of walls separating the part under consideration from other heated parts of the building, while A is the ground-floor area under consideration. - unheated spaces outside the insulated fabric of the building (such as porches, attached garages or storge ares) are excluded when determining P and A (but the length of the wall between the heated building and the unheated space is included in the perimeter; the ground losses are assessed as if the unheated spaces were not present).