Access to the CPCI Thermal Performance Calculator requires you to login. Please provide the credentials you were provided from your registration in the fields below. If you have not registered and would like to, please click here to register for the calculator.
RDH Building Science Inc. and CPCI cannot accept responsibility of any errors or oversights in the use of the tool or in the preparation of architectural or engineering plans. The design professional must recognize that no design guide or tool can substitute for experienced engineering and professional judgment. This calculator is intended for use by professional personnel competent to evaluate the significance and limitations of its contents and able to accept responsibility for the application of the material it contains.
Energy and thermal performance requirements are growing and playing an increasingly significant role in building codes throughout North America. However, understanding and meeting the requirements has also become increasingly complex for building designers. At the same time, it has become clear that important decisions regarding basic enclosure assembly design and window area need to be made early in the design process to achieve the most cost-effective, energy-efficient, and comfortable building.
The Meeting and Exceeding Building Code Thermal Performance Requirements guide provides designers, builders, and building owners with an introduction to compliance options for modern building codes, and suitable methods for quickly estimating, at an early design stage, the thermal performance of precast concrete enclosure wall systems.
When a 'Window-to-Wall Ratio' or 'Window USI-value' are not provided or not known these results will be unavailable.
Overall USI-value: W/m²K
Overall RSI-value: m²K/W
Overall R-value: h-ft²°F/Btu
* Assembly R-value or Centre-of-Cavity is calculated by assuming the assembly is one-dimensional and simply adding the thermal resistance of all layers (e.g. in a precast concrete double-wythe insulated "e;sandwich"e; panel, the outer concrete, insulation, inner concrete, air films).
** Clear Wall R-value (Rcw) accounts for the thermal resistance of the layers (assembly Rvalue) but also includes the two-dimensional effect of standard repetitive framing (e.g. steel studs and tracks), and conductive penetrations (e.g. floors).
DISCLAIMER: Substantial effort has been made to ensure that all data and information in this Thermal Value Calculator is accurate. RDH Building Science Inc. and Canadian Precast/Prestressed Concrete Institute cannot accept responsibility of any errors or oversights in the use of the tool or in the preparation of architectural or engineering plans. The design professional must recognize that no design guide or tool can substitute for experienced engineering and professional judgment. This Thermal Value Calculator is intended for use by professional personnel competent to evaluate the significance and limitations of its contents and able to accept responsibility for the application of the material it contains. Users are encouraged to offer comments to Canadian Precast/Prestressed Concrete Institute and/or RDH Building Science Inc. on the content and suggestions for improvement. Questions concerning the source and derivation of any material in the Thermal Value Calculator should be directed to CPCI at helpdesk@cpci.ca
