What Is the Passive House (PHIUS) Certification Process?
PHIUS certification verifies the building meets the passive-house performance — the ultra-low energy use (the heating/cooling demand caps), the airtightness (0.06 CFM50/sq ft), and the comfort criteria — through the design review, the construction verification, and the testing. The process: the pre-certification (the energy model approved), the construction (the verified details), and the final certification (the blower-door and the documentation). The accountability making the passive house perform.
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The performance targets
Heating/cooling demand (the climate-specific caps — the kBtu/sq ft/yr limits; the peak loads — the 3-5 Btu/hr/sq ft enabling the simplified HVAC), the source energy (the total — the cap including the plug loads), and the airtightness (the 0.06 CFM50 per square foot of enclosure — the blower-door test; the mid-construction test catching the leaks). The comfort (the temperature uniformity — the no-draft, no-cold-spot criteria).
The certification steps
Pre-certification (the WUFI Passive model — the energy model; the design documents — the enclosure details, the window specs, the ventilation; the PHIUS rater's review and the approval before the construction), the construction verification (the rater's site visits — the air-barrier inspections, the insulation verification, the window installation; the mid-construction blower-door), and the final (the final blower-door — the 0.06 target; the ventilation commissioning — the balanced HRV/ERV verified; the documentation — the certification issued).
Design implications
The enclosure (the superinsulation — the R-40+ walls, the R-60+ roofs; the thermal-bridge-free — the details eliminating the bridges; the triple-pane windows — the U-0.15 typical), the ventilation (the HRV/ERV — the 80%+ heat recovery; the balanced — the commissioning), and the cost (the 3-8% premium — the enclosure and the windows; the HVAC savings — the tiny loads needing the tiny systems; the operating savings — the 60-80% energy reduction). The PHIUS+ Source Zero (the renewables offsetting — the net-zero path).
The bottom line
PHIUS certification (WUFI modeling, 0.06 airtightness, construction verification) delivers 60-80% energy savings at a 3-8% premium — the enclosure, the triple-pane windows, and the HRV/ERV.
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