COMPLIANCE PATHWAY
COMPLIANCE PATHWAY
Prescriptive Path:
The Prescriptive Path is a traditional method where a building design and construction must comply with specific, pre-established code requirements. This method provides a set of pre-determined guidelines that specify certain materials, design features, and construction techniques that must be used to meet the code requirements. For instance, the prescriptive path may require a specific u-value for a storefront product, a specific type of windows, or a certain size of HVAC unit for a particular size of building.
Performance Path:
The Performance Path is a more flexible approach that allows the building design and construction to meet code requirements by demonstrating that the building will perform as well as or better than the prescriptive requirements. The Performance Path method is more performance-based, and it considers the specific conditions of each building, including location, climate, and site orientation, to determine the energy efficiency and sustainability of the building. For example, instead of requiring specific window u-values, the performance path might require that the building use a certain amount of energy, with the understanding that the building's design must include window that will achieve that energy goal.
In summary, the primary difference between the Prescriptive Path and Performance Path is that the Prescriptive Path follows predetermined requirements, while the Performance Path is more flexible, allowing for a customized approach based on the specific conditions of the building.
Which is more stringent, IECC or ASHRAE 90.1?
In general, ASHRAE Standard 90.1 is considered to be more stringent than the International Energy Conservation Code (IECC) in terms of energy efficiency requirements. This is because ASHRAE 90.1 is specifically focused on energy efficiency for buildings, while the IECC covers a broader range of building safety and performance issues.
ASHRAE 90.1 is updated on a regular basis to reflect advances in building technology and energy efficiency standards. The most recent version of ASHRAE 90.1, published in 2019, includes more stringent requirements for building envelope performance, lighting controls, and mechanical systems than previous versions.
However, it's important to note that compliance with either code can result in significant energy savings compared to buildings constructed without any energy efficiency standards. Both codes are widely used and accepted by building departments and industry professionals throughout the United States.