Tag: understanding sampling
Posted by: DuctTesters | on June 21, 2016
The real number of sampled versus inspected homes cannot be pre-determined by simply dividing. Sampling protocol criteria as set forth by the California Energy Commission (CEC) must be followed. Sampling protocol requires to first conduct a HERS verification of one of every single plan type and option variation (based on square footage), then set those aside as the modeled plans. Then the HERS verification continues to inspect production homes to make sure there are not any recurring non-compliance issues. Once it is determined that the trades are installing according to the energy codes without recurring issues, then the spot-checking (aka sampling protocol) begins.
The CEC gives HERS Raters two options: Open Groups (1 in 5) and Closed Groups (1 in 7).
- Open group sampling is performed in batches of 5 to process and provide documents as each home nears permit sign off. Basically, documents are processed and provided for each home that has CF2R trade forms completed without having to wait for the other homes in that group.
- Closed group sampling is performed in batches of 7, however no documents for any of those 7 homes can be processed until all CF2R trade forms are uploaded to the registry by the subcontractors. Basically, the HERS Verification gets held up and cannot provide CF3R documents on any homes in that group until all 7 houses have CF2R trade forms completed. Then the entire group of 7 at one time is processed and provided.
In situations where there may be issues, DuctTesters always works with the subcontractor trades to help educate them of the energy codes and testing requirements. DuctTesters does not and can not make changes or adjustments, however DuctTesters will work with the trades to help them trouble shoot and learn moving forward.
The DuctTesters team of Certified Energy Analysts and Certified Home Energy Rating System (HERS) Raters are dedicated to quality work that ensures that the energy features proposed on paper are what actually gets installed during the construction process. Behind the scenes is a friendly office staff that supports it all and is eager to please each client. The office staff handles all the paperwork, also attends industry training, sends out accurate bid proposals with no hidden costs, and can handle the industry jargon and tough questions.
**Please note this is DuctTesters interpretation. It is the responsibility of anyone utilizing this information to ensure that it is in compliance with the CEC and CA Title 24 Standards.**