Air leakage / Guides

Air and vapour barriers

Aerobarrier home and attic air-sealing spray

...air seal is thereby created around any openings and cracks in ceilings, walls, windows, plumbing and electrical penetrations. This is an easy way to plug holes in your air barrier that you can’t possibly see - from as small as a human hair to as big as a half-inch wide. The airflow in the home is monitored in real ti...

Living green wall
Healthy indoor air quality

Living walls: what they do and don't do

...air quality. Simply due to the rate of air leakage in most buildings, it would be difficult for anything short of an airtight house and a virtual jungle of plants to see a measurable improvement in air quality. However, from a quality of life and design perspective, these make for very cool living rooms. Having potte...

Thermal image showing where home heat loss is occurring.
Insulation and soundproofing

How insulation works

...air. It can be caused by warm air rising near heating devices and cool air dropping close to cold surfaces, especially windows. Both these effects are known as natural convection, as opposed to forced convection where the wind or the use of ventilators create a greater impact. In homes with significant air leakage,...

Off grid, passively heated and cooled house in the Gatineau Hills, Que
Off-grid and Net-Zero Housing

Off grid living blog, part 2: passively heated, this house in Quebec aims for LEED certification

...air barrier allows it to do what it is intended to do - stop air leakage - which commonly accounts for about a third of the heat loss of a home and the greatest risk for moisture damage inside walls. The insulating value of the wall adds up to R48.8 in total, which is about twice that of most provincial building code...

Heat Recovery Ventilation - Lunos video
HRV and ERV

Lunos ductless air exchanger

...air-sealed high performance home, bringing in fresh air and removing moisture. An HRV uses the heat in stale exhaust air to warm incoming fresh air. Until now, this has meant a centralized heat transfer core and a network of ducts feeding and drawing air throughout the home. With Lunos wall insert air exchangers that i...

How to Vent Roofs - the Methods, Vent Types, Fans
Walls and Roofs

Why Roofs need to be ventilated and how to ventilate a roof properly

...air rises, so there is always more air pressure at the higher points of any house or building, as in the top floor ceiling. And air will find any hole no matter how small it is. Wind pressure as well as interior mechanical ventilation also affects the air pressure in a home and will force air out any breach in your air...

BC Energy Step Code - Builder Design Guide &  Requirements explained
Building codes

The new BC energy step code: builder design guide & requirements explained - Vancouver

...air leakage targets, but that just means being a little more vigilant with the way air barriers are installed and the way breaches in the building envelope are sealed; such as plumbing, electrical and ventilation openings, and how to ensure windows and doors are properly sealed . New BC Energy Step Codes - A Step i...

How to Choose between an HRV and ERV system
HRV and ERV

Choosing between an HRV and an ERV

...air is enough? How much fresh air comes in through the building envelope? What is the difference between an ERV and an HRV? How to choose between an HRV and an ERV? How much fresh air is required in homes and the best way to provide it are important issues. Energy recovery from exhaust air is be...

LEED Homes

The 19 LEED for Homes Prerequisites

...air systems must have air filters with a minimum efficiency reporting value (MERV) ≥ 8 and ensure that air handlers can maintain an appropriate system pressure drop. Air filter housings must be airtight to prevent bypass or leakage. 9.1 Radon-resistant construction: Homes in high-risk radon gas areas must have prot...

Building a Passive House that's LEED Certified too - an Owner's Tale
Passive House

An owner/builder's account of building a Passive House

...air being fed into the air exchanger. For additional heat we installed two little mini-split heat pumps (one head on the ground floor and another upstairs) which can extract heat from the outside air down to temperatures as low as -27.7°C. The air exchanger will then take care of circulating the warm or cool air. T...

Passive House certification - PHI or PHIUS? The Spring House Passive House
Passive House

Everything you need to know about Passive House certification

...airtightness of a building is calculated by measuring leakage - the volume of air (in cubic feet per minute, CFM) entering a building pressurized at 50 Pascals and dividing that measurement by the net air volume of the house. Simple enough. But does it make sense? After all, air leaks happen through a building’s shell ...