Passive House Library

BC ENERGY STEP CODE

The BC Energy Step Code standardizes pathways to the next generation of buildings that aim to meet Passive House levels of performance for new construction by 2032.  This is a provincial building regulation that was introduced in April 2017.  Currently, numerous municipalities are already enforcing a specified Step level in the BC Energy Step Code.  Overwhelming news for many Architects as the traditional prescriptive approach in the current BC Building Code would no longer be compliant when adopted by a municipality beyond Step 1.  Essentially, a conventional house design will evolve into Passive House design by 2032 if not sooner.  Click here to learn more about the BC Energy Step Code.


BUILDING ENCLOSURE

A building enclosure is also called an environmental separator in Building Codes.  The building enclosure refers to those parts of the building which separate inside conditioned space from unconditioned or outside space, and includes exterior foundations, exterior walls, windows, doors, roofs and floors.  A building’s enclosure can define its value, performance and architectural expression.  A thoughtfully designed building enclosure can make a new building work more effectively for its owners, occupants and environment.  With a full building enclosure renovation, it can also transform the performance of an existing building.


HEAT RECOVERY VENTILATION (HRV)

Heat recovery ventilation (HRV) requires a mechanical device and air distribution ducts that exchange stale indoor air with fresh outdoor air.  Heat is transferred from the outgoing air to the incoming air by passing the two air streams through a heat-exchange core.  The two air streams are kept separated, and only the heat is transferred to the incoming air, which is then circulated throughout the house.  In most cases, fresh air is delivered to bedrooms and the living room, while stale air is removed from bathrooms, laundry rooms, and the kitchen.

In an airtight house, such as a Passive House, an HRV is much more effective at recovering a large percentage of the heat that would otherwise be lost by means of uncontrolled leaks/drafts through the building enclosure.  This is a mandatory component in a Passive House which provides most or all of the heating demand significantly reducing the operating (utility) costs.  A Certified Passive House requires a HRV with equal to or greater than 75% heat recovery efficiency with a maximum electricity demand of 0.45 Wh/m³.

HRV is absolutely essential for creating a healthy indoor environment and improving indoor air quality.  A highly efficient HRV installed in a Passive House produces numerous benefits including the following:

  • Ensures delivery, distribution and circulation of filtered fresh outdoor air throughout the house
  • Controls indoor air humidity levels to prevent moisture problems such as condensation on windows and mold growth
  • Helps control odours and humidity levels throughout the house
  • Dilutes indoor air contaminants produced from off-gassing building materials and volatile organic compounds (VOC)
  • Provides better comfort by warming incoming ventilation air
  • Filters potentially polluted incoming air from outside

THERMAL BRIDGE

A thermal bridge may be linear or an isolated point of low thermal resistance in a building enclosure.  Thermal bridging results in heat bypassing the insulation (thermal barrier) reducing effective R-value of the entire wall/roof/floor.  Thermal bridges cause localized heat losses and may cause mould growth and structural deterioration.  All thermal bridges must be accounted for when conducting an accurate energy model of a building.  Akira Living personnel have extensive experience with Therm software to analyze any custom building enclosure junction to determine its PSI-value.  Akira Living’s construction drawing details are evaluated with Therm to assess the impact and reduce or prevent thermal bridges.  Thermal bridge assessment is crucial in both Passive House and conventionally constructed buildings.


BLOWER DOOR TEST

A Blower Door Test is conducted by a trained technician to verify the airtightness of the building enclosure to determine how leaky/drafty it is.  This is a crucial test when building a Passive House and is mandatory if pursuing a Certified Passive House.  For Passive House Certification the Blower Door Test must comply with the EN13829 Standard with an airtight building enclosure measured to be equal to or less than 0.6 air changes per hour (ACH) at 50 Pascal.  The test is a simple procedure where a door fan is temporarily installed in an exterior doorway to pressurize and depressurize the building to 50 Pascal.  This differential pressure measurement test corresponds to wind speeds of 15 to 35 km/h that can quickly suck out all the heated air inside a conventional building.  This test should first be conducted when the air barrier system is exposed during the construction stage to help detect/repair air leaks and for quality assurance.


INFRARED THERMOGRAPHY

Thermography is the process of acquisition and analysis of thermal information from a thermal imaging camera (a.k.a. infrared camera). An infrared camera can be used to detect building defects by observing heat flow through the building enclosure.  Infrared thermography surveys are non-invasive and may detect various defects in the building enclosure not visible to the naked eye including but not limited to the following:

  • air leakage at opaque assemblies or at window transitions
  • water ingress or plumbing leaks
  • missing and/or displaced insulation
  • detection of thermal bridges

Other Resources for the Passive House Standard

Organizations & Groups:

International

Passive House Institute (PHI):  The first Passive House Institute in Darmstadt, Germany

http://www.passivehouse.com/

International Passive House Association (iPHA):  A global network for Passive House knowledge working to promote the Passive House Standard worldwide

http://www.passivehouse-international.org/

North American Passive House Network (NAPHN)

http://naphnetwork.org/

Passive House Academy

http://www.passivehouseacademy.com/

 

Canada

Passive House Canada

http://www.passivehousecanada.com/

Canadian Passive House Institute (CanPHI)

http://www.passivehouse.ca/

Canadian Passive House Institute West (CanPHI-West)

http://canphi.ca/

Passive Buildings Canada (PBC)

http://www.passivebuildings.ca/

 

USA

Passive House Northwest (PHnw)

http://www.phnw.org/

New York Passive House (NYPH)

http://nypassivehouse.org/

passivhausMAINE

http://passivhausmaine.org/

Passive House Western Pennsylvania (PHWPA)

http://www.passivehousewpa.org/

Passive House California (PHCA)

http://passivehousecal.org/

 

Find a local Certified Passive House Designer & Consultant

Passive House Canada PHI Certified Professionals Directory

Passive House Canada Membership Directory: Canadian list of Certified Passive House Designers, architects, contractors, builders, etc.

 

VIDEOS

Passive House Explained in 90 seconds

https://vimeo.com/74294955

Passive Passion:  22-minute USA documentary that examines the first Passive House and the standard used in the USA today.

https://vimeo.com/32007211

Introducing Fort St. John’s 1st Passive House Residence:  4-minute tour of a completed Passive House in Fort St. John, BC, Canada.

https://www.youtube.com/watch?v=OHxQsGE1k70

Whistler’s Austria Passive House:  4-minute tour of a completed Passive House in Whistler, BC, Canada.

https://www.youtube.com/watch?v=NgDRKSQp2RI

Alta Lake Passive House Timelapse:  5-minute time-lapse of a large Passive House being constructed in Whistler, BC, Canada.

https://www.youtube.com/watch?v=t7kSIQQqiss

 

TECHNICAL INFORMATION

Passipedia:  The Passive House Resource

http://www.passipedia.org/start

VBBL 2015 1 & 2 Family Homes in Vancouver: Presentation by Chris Higgins, City of Vancouver

 

PUBLICATIONS

Net Zero Energy Buildings, Passive House + Renewables:  This 2015 eBook by NAPHN demonstrates that the Passive House pathway is the best way to reach Net Zero.

Passive House pamphlet:  Introduction of Passive House by iPHA.

Active for more comfort – The Passive House:  Passive House brochure by iPHA.

BRE Passivhaus Primer – Introduction

BRE Passivhaus Primer – Designer’s Guide

BRE Passivhaus Primer – Contractor’s Guide

BRE Passivhaus Primer – Airtightness Guide

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COMFORTABLE

Discomfort is felt when your body radiates heat to colder surfaces around you. This does not happen in a Passive House. Super-insulated building enclosure including high performance windows ensures comfortable interior conditions with no cold surfaces on the walls, floor, or roof. No temperature swings or drafts. The constant interior temperatures provide a new level of comfort – once you experience it you won’t go back.
BETTER INDOOR AIR QUALITY
Heat recovery ventilation (HRV) system delivering constant fresh filtrated air resulting in better indoor air quality, free of mold and lower levels of carbon dioxide, creating a healthy space to live.
SOUNDPROOF
Super-insulated and airtight building enclosure eliminates nearly all street noise when all windows and doors are closed. So you can get back to Netflix in peace and quiet.
DURABLE
Super-insulated and airtight building enclosure that’s thermal bridge free with controlled ventilation prevents condensation from forming on interior surfaces. A structure free of condensation damage will ensure an extraordinary service life.
HIGH PERFORMANCE
Passive House buildings consume 75% to 90% less heating energy than conventional homes. Save money on your monthly expenses by reducing your energy consumption.
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