PHIUS+ 2018 Passive Building Standard Certification Guidebook Version 2.0 15 February 2019 Passive House Institute US (PHIUS) 116 West Illinois Street, Suite 5E Chicago, IL 60654 (312) 561-4588 www.phius.org © Passive House Institute US (PHIUS) | PHIUS+ Certification Guidebook Contents 1. ABOUT PHIUS+ 2018 .....................................................................................................................................................................7 1.1 INTRODUCTION .................................................................................................................................................................................................... 7 1.2 WHY CERTIFY? .................................................................................................................................................................................................... 8 1.3 ABOUT THIS GUIDE .............................................................................................................................................................................................. 9 1.4 THE PROJECT TEAM ............................................................................................................................................................................................ 9 1.5 TYPES OF PROJECTS ......................................................................................................................................................................................... 10 1.5.1 Single-family Residential Projects ................................................................................................................................................ 10 1.5.2 Multifamily Residential Projects ................................................................................................................................................... 10 1.5.3 Campus/Community Certification ................................................................................................................................................ 10 1.5.4 Commercial/Non-Residential Projects ....................................................................................................................................... 10 1.5.4.1 Dorms & Hotels/Motels ...................................................................................................................................................................................... 11 1.5.5 Mixed-Use Projects .............................................................................................................................................................................. 11 1.5.6 Retrofit Projects ................................................................................................................................................................................... 16 1.5.7 Buildings with Seasonal Use ........................................................................................................................................................... 16 2. GENERAL NOTES/GUIDANCE ................................................................................................................................................... 17 2.1 GENERAL CHALLENGES ASSOCIATED WITH ENERGY EFFICIENT BUILDINGS ......................................................................................... 17 2.2 “YELLOW FLAG” ITEMS ................................................................................................................................................................................... 17 2.3 TIPS TO DESIGN A LOW-COST PASSIVE BUILDING ...................................................................................................................................... 17 2.4 TIPS ON ASSEMBLIES ....................................................................................................................................................................................... 17 2.5 TIPS ON ASSEMBLY R-VALUES ....................................................................................................................................................................... 19 3. BUILDING CERTIFICATION REQUIREMENTS ..................................................................................................................... 19 3.1 OVERVIEW/SPACE CONDITIONING ............................................................................................................................................................... 19 3.1.1 Main Performance Criteria for Certification ............................................................................................................................ 19 3.1.2 Summary of Other Requirements .................................................................................................................................................. 19 3.1.3 Optional Additional Certification Badges .................................................................................................................................. 20 3.1.4 Window Recommendations ............................................................................................................................................................. 20 3.2 AIRTIGHTNESS CRITERION .............................................................................................................................................................................. 20 3.3 NET SOURCE ENERGY CRITERION ................................................................................................................................................................. 22 3.3.1 Non-Residential Buildings ............................................................................................................................................................... 23 3.3.2 Residential Buildings: Low-Rise and High-Rise ....................................................................................................................... 23 3.3.3 Mixed-Use Buildings ........................................................................................................................................................................... 23 3.3.4 Renewables Credits ............................................................................................................................................................................. 24 3.3.5 Tip: Determining the Equivalent Source Energy Allowance in kBTU/ft2.yr................................................................ 25 3.3.6 Co-Generation ....................................................................................................................................................................................... 25 3.4 MOISTURE DESIGN CRITERIA FOR ASSEMBLIES AND DETAILS ................................................................................................................. 25 3.4.1 Minimum Interior Surface Temperature for Thermally-Bridged Construction Details .......................................... 25 3.4.2 Window Condensation Resistance ................................................................................................................................................ 26 3.4.2.1 Other Condensation Resistance Ratings ..................................................................................................................................................... 27 3.4.3 Limiting Moisture Risk in Assemblies .......................................................................................................................................... 27 3.4.3.1 Climate-Appropriate Wall and Roof Assemblies .................................................................................................................................... 27 3.4.3.2 Masonry Walls and Freeze-Thaw .................................................................................................................................................................. 28 3.4.3.3 Floor/Slab Components...................................................................................................................................................................................... 28 3.5 QUALITY-RELATED PRESCRIPTIVE DESIGN REQUIREMENTS (QA/QC CHECKLIST ITEMS FOR CPHC/DESIGNER) ...................... 28 i 3.5.1 Fireplaces ............................................................................................................................................................................................... 29 3.5.2 Building Envelope ............................................................................................................................................................................... 29 3.5.3 Ventilation.............................................................................................................................................................................................. 31 3.5.3.1 Fresh Air Supply ..................................................................................................................................................................................................... 31 3.5.3.2 Ventilator Defrost .................................................................................................................................................................................................. 31 3.5.3.3 Balanced Ventilation Requirements ............................................................................................................................................................