|Sample R-Value Guidelines||R-value ranges|
|1||Miami, FL or Honolulu, HI||19 - 27||44 - 60||2ft R-8 vertical perim|
|2||Jasonville, FL or Phoneniz, AZ||19 - 27||30 - 70||Uninsulated|
|3||Charleston, SC or Sacramento, CA||15 - 31||30 - 60||Uninsulated, or 2-4ft R-8 vertical perim|
|Marine 3||San Francisco, CA||19 - 23||30 - 80||4ft R8-20 vertical perim|
|4||Baltimore, MD or Amarillo, TX||31 - 51||49 - 80||2-4ft R8-20 vertical perim|
|Marine 4||Salem, OR or Seattle, WA||31 - 43||60 - 70||4ft R-20 vertical perim, or whole-slab R-20|
|5||Providence, RI or Flagstaff, AZ||31 - 43||60 - 70||4ft R-20 vertical perim, or whole-slab R-20|
|6||Burlington, VT or Bilings, MT||39 - 51||70 - 90||whole-slab R20-28|
|7||Duluth, MN or Edmonton, AB||49 - 65||80 - 90||whole-slab R28-40|
|8||Fairbanks, AK||89||120||whole-slab R-40|
|* Actual values will vary by project|
Hitting the Performance Target
A Certified Passive House Consultant (CPHC®) employes a combination of principles to achieve the PHIUS+2015 performance goal
Continuous insulation at high levels throughout the entire envelope. Passive buildings have thicker-than-usual walls.
Elimination of thermal bridges
Any place a building component penetrates the envelope from the exterior to the interior is called a thermal bridge. In conventional buildings, multiple bridges add up to significant energy lost. In passive buildings, they are designed out.
Passive building envelopes are much tighter than conventional code building, preventing energy loss through infiltration, and ensuring building durability.
High performance windows/doors
Passive buildings use high performance windows and doors that minimize energy loss.
Optimize solar gain
Through orientation and shading methods, designers get the most out of passive solar heating in heating season, and minimizes its impact during cooling season.
In an airtight building, mechanical ventilation is designed to assure continuous fresh air. Typically, the designer employees a balanced heat and moisture recovery ventilator. Energy Recovery Ventilators (ERVs) use heat exchange technology that allows intake air to scavenge energy from the already-conditioned exhaust air.
The result – a building that provides:
- Superior comfort and indoor air quality
- Low energy bills
- Resilience – in a power outage passive buildings maintain comfort for days
- Durability – designed to minimize risk of moisture and other issues