Phius Certified Rater

Phius Certified Raters deliver on-site quality assurance and oversight for residential Phius projects.

The Role of a Rater

Phius Certified Rater training is geared toward professionals with experience testing and commissioning single-family, townhome, and low-rise multifamily buildings. This designation is built upon the RESNET HERS Rater.

For a project pursuing Phius Certification, the Rater is responsible for 3rd party quality assurance, on-site inspections and performance testing throughout the construction process and at final construction.

These professionals are critical to ensure that the building is built and operating to the plans and specifications that are design certified by Phius.

Phius Certified Rater Program Overview

View the Phius Certified Rater Training Schedule

Learn about the Phius Certified Rater Exam

Meet the Phius Certified Rater Instructors

View the Phius Certified Rater Manual

Key Competencies of a Phius Certified Rater

Building Science

Phius professionals learn how controlling moisture, heat, and airflow in buildings define best practices in building design for comfort, efficiency, durability, and air quality.

High-Performance Building Enclosures

From moisture control strategies to thermal-bridge-free design strategies, passive building places emphasis on getting the enclosure right. Phius Certified Raters inspect the enclosure and quality of insulation installed.

High-Performance Mechanical Systems

Balanced ventilation and high-performance heating, cooling, and domestic hot water systems are critical elements of passive building design. Raters must understand how to commission and test high performance equipment.

Airtightness Testing Protocol & Troubleshooting

An airtight enclosure is cornerstone to passive building. Phius Certified Raters understand testing protocols and how to inspect and troubleshoot an air control layer in the building enclosure.

Phius Certification Requirements

Raters are responsible for ensuring the project meets all inspectable, mandatory requirements and have a deep understanding of the Phius Certification program requirements.

Co-Requisite Program Requirements

The third party co-requisite programs such as Energy Star, EPA Indoor airPLUS and DOE Zero Energy Ready Home build the foundation for Phius' set of quality assurance requirements. Raters hold the knowledge of these foundational programs for residential construction.

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I’m very proud of my Phius Rater credential and experience. Phius’ training, technical support, passionate colleagues, and continuing education opportunities have helped position me and our company as go-to partners for sustainable design in our region.

Chris Dwyer , Vice President, Energy, Sol Design+Consulting

The credentials give us the credibility for our understanding of high-performance building beyond the baseline building science knowledge of other professional certifications. We've received a multitude of inquiries solely because of Phius' directory.

Greta Tjeltveit , Senior Project Associate, Evergreen Certified