This model adds another element for the roof. Roofs commonly
  exhibit the same excitations as exterior walls but have different coefficients
  of heat transfer due to their orientation. Adding an extra element for the roof
  might lead to a finer resolution of the dynamic behaviour but increases
  calculation times. The roof is parameterized via the length of the RC-chain
  nRoof,
  the vector of capacities CRoof[nRoof], the vector of resistances
  RRoof[nRoof] and remaining resistances RRoofRem.
  
The image below shows the RC-network of this model.
   
  
massDynamics.nExt to nRoof for
RRoof and CRoof
alphaRoof to hConRoof,
alphaRoofConst to hConRoof_const