Question

Identify the circumstancesWhen 'User specified' R/RSI values can be used for building assemblies

A)When default values are not available
B) Always use default values
C)When the building is older than 50 years
D) Only for commercial buildings

Answer 1

User specified R/RSI values for building assemblies can be used when default values are not available, for buildings with unique characteristics, or for commercial buildings where default values may not apply. These are applied specifically to ensure accurate thermal resistance evaluation.

Step-by-step explanation:

To identify the circumstances when 'User specified' R/RSI values can be used for building assemblies, it is important to understand the specific building codes and guidelines in place. Typically, 'User specified' R/RSI values are utilized under specific conditions, such as:

1. When default values are not available, and alternative values need to be determined based on actual building materials and methods used.
2. For buildings with unique characteristics where default values may not adequately represent the actual thermal resistance, such as historical buildings or unique architectural designs.
3. In the case of commercial buildings where custom or high-performance materials are often used and the default values may not be applicable.

It is not correct that 'User specified' R/RSI values should always use default values or only when the building is older than 50 years without regard to other factors that might necessitate a specific evaluation of the building's thermal properties.