When the Building Materials version of the predefined Heat and Moisture Transport () interface is added (found under the Heat Transfer branch () of the Model Wizard or Add Physics windows), it combines the Heat Transfer in Building Materials and the Moisture Transport in Building Materials interfaces to model coupled heat and moisture transport in building materials, by taking into account heat and moisture storage, latent heat effects, and liquid and convective transport of moisture.

As a predefined multiphysics coupling, Heat Transfer in Building Materials and Moisture Transport in Building Materials interfaces are added to the Model Builder. In addition, a Multiphysics node is added, which automatically includes the Heat and Moisture multiphysics coupling feature.

The Heat Transfer in Building Materials interface provides features for modeling heat transfer by conduction, convection, and radiation. The Building Material model, active by default in all domains, provides in addition the functionality for moisture content dependency of thermodynamics properties and latent heat effects.

The Moisture Transport in Building Materials interface provides features for modeling moisture transfer by liquid transport (capillary flow) and vapor diffusion. A Building Material model is active by default on all domains.

The Heat and Moisture multiphysics coupling is also available when there is at least one of each of the following interfaces with the specified model activated: