Understanding and optimizing the heat transfer through the walls is important in high performance building design.  Using thermal mass and insulation to your advantage with passive design strategies can help reduce the amount of energy that active systems need to use.

Dive Deeper


Thermal insulation is a material that blocks or slows the flow of heat through the building envelope. Insulation is vital to most green building design because it allows spaces to retain what heat they have, while avoid gaining excess heat from outside. Learn how to measure insulation and about different types of insulation.

Total R-Values and Thermal Bridging

In order to know the building’s true thermal performance, you must calculate overall R-values for assemblies like walls, roofs, floors, and glazing. Thermal resistance adds differently if it is in series or parallel.