
Hygrothermal for Phius
Phius staff members James Ortega, Al Mitchell and Isaac Elnecave break down the do's and don'ts of hygrothermal for Phius projects.

ASHRAE 227 Passive Building Standard Released for Public Comment
Phius Senior Scientist Graham Wright provides details on the release of ASHRAE Standard 227 - Passive Building Design for public comment.

Passive House Murder Mystery Part IV: Phius Goes Mainstream
In the fourth and final installment of the Passive House Murder Mystery blog series, Phius Co-Founder & Executive Director Katrin Klingenberg recounts the rise of Phius into mainstream building codes.

PHIUS+ 2018 Standard Setting Documentation
Technical write-up of the research and methodology used to create the PHIUS+ 2018 passive building standard.

Phius 2021 Standard Setting Documentation
Technical write-up of the research and methodology used to create the Phius 2021 passive building standard.

How Phius is Leading the Charge to Zero
With Net Zero Buildings Week on the horizon, we take a look at the Phius ZERO standard and what makes Phius the best path to net zero.

Phius Single-Family Quality Assurance Workbook
This workbook combines the requirements of all of Phius' co-requisite programs and includes all of Phius' quality assurance requirements. It is to be completed by the Phius Certified Rater on the project and submitted fully filled out to Phius for final certification.

A Sneak Preview of Phius REVIVE Pilot Ahead of Phius Retrofit Summit 2023
Phius Senior Scientist Graham Wright provides a glimpse inside the process of creating the new Phius REVIVE program for retrofits that is currently under development.

Phius Multifamily Quality Assurance Workbook
The multifamily workbook combines the requirements of all Phius' co-requisite program requirements for Phius Certification and includes all of Phius' quality assurance requirements. It is to be completed by the Phius Certified Verifier on a multifamily project and submitted fully filled out to Phius for final certification.
Below are links to download v2.2 and v2.3, read further to determine which applies to your project.
Phius Window Comfort & Condensation Risk Assessment
The window comfort and condensation risk criterion applies to all projects, regardless of size. Use the calculator below to determine the requirements to ensure comfort and minimize condensation risk for your project.