Resource Library

This is a "performance criteria" protocol for assessing moisture risk in opaque assemblies. It is referred to as a compliance path in the Certification Guidebook, section B-1. The current version mainly pertains to WUFI Pro.

Phius Certification Manager Al Mitchell answers questions about the WUFI Passive energy modeling software.

The Phius Certification Guidebook is the one-stop-shop for all things related to the Phius project certification program.

Use this estimator to determine if a building targeting Phius Certification is required to provide a dedicated make-up air system when using intermittent direct exhaust systems such as exhaust dryers or exhaust kitchen range hoods.

This calculator can be used to determine psi-values for 2-D thermal bridges in combination with THERM.

Phius Certification Manager Al Mitchell utilizes energy modeling tools to examine the future of building construction through the lens of passive building.

Phius Certification Manager Al Mitchell answers questions about REVIVE 2024 modeling.

WUFI Passive takes a conservative approach to DHW modeling for non-residential projects. Phius has developed this tool to estimate the effective DHW modeling inputs for non-res projects using WUFI or METr.

This calculator should be used to determine the 'Mechanical Room' temperature when a mechanical ventilation device is located outside of the thermal envelope. (eg. the roof) This version includes the ability to input custom climate data.

Phius Certification Program Director James Ortega fields questions on WUFI Passive.