How to Build a Net Zero Building

Across the globe, industries of every kind are working to reduce the impact they have on the environment, and the construction industry is no different. One of the most pressing issues it faces is the incorporation of green technology and sustainability in new buildings.

The Province of British Columbia has instituted a building code as a means of improving energy efficiency. First introduced in 2008, this has given builders and designers efficiency requirements to follow. In 2017, the BC Energy Step Code was adopted as a regulation and became the new standard intended to lay a course for the future, giving until 2032 for all new construction to become “net-zero energy ready.”

Net-zero-ready buildings are those that are so energy-efficient that they will offset the majority or the entirety of the energy they consume annually. The BC Energy Step Code lays out the standards for new construction, grouped into “steps.” The first few steps are relatively simple, but as they progress, they become more challenging.

Although the deadline for every new building to be Step 5 (net-zero) is 2032, many Step 5 buildings are already being built through a combination of high-performance designs and systems. Some of the ways of reaching Step 5 include:

• Exterior Insulation. This works effectively like a sweater for the building and involves installing 2-6 inches of rigid foam insulation on the outer side of the wall framing. This can also be applied to older homes to make them more energy-efficient. Custom Framing is often required for the additional space needed for insulation.

• Sealing and Insulating the Building. As the means of sealing and insulating buildings improves, the energy required to heat and cool the interior is reduced. Less heat will escape in cold weather and maintaining a cool temperature in summer will be easier. With the building sealed airtight, however, you will need an energy-efficient source of fresh air.

• High-efficiency Heat Recovery System. This is a system that allows for the bringing of fresh air into the building while still regulating the temperature. In winter, for example, warm, stale air is exhausted from the building but some of its heat it retained. As cold fresh air enters, it takes some of that heat energy, reducing the energy needed to maintain the internal temperature.

• Triple Glazed Windows. Triple glazing is roughly 40% more thermally efficient than double glazing, resulting in considerable energy savings. These windows will reflect heat back, reducing heat loss. Even better, they reduce sound so that you can enjoy an afternoon nap even if your neighbour is mowing their lawn.

• Energy-efficient Heating and Cooling System. Even when the building is sealed and insulated, it is still necessary to provide heating and cooling. Systems like mini-split heat pumps are highly efficient, less expensive to install than large air handlers, and are great additions for many zero energy homes and buildings.

• Renewable Energy. One of the most essential means of reaching net-zero energy involves the use of renewable energy sources such as sunlight. Solar energy can help maximize the building’s heating and cooling and reduces reliance on finite energy sources.

Modern technology and building practices are resulting in homes that are highly energy-efficient, and even net-zero. While the cost of reaching Step 5 may be higher, there are many advantages, including increased occupant comfort, reduced energy consumption and energy costs, greater reliability, and a considerably reduced impact on the environment.

To learn more about hitting a high Step target or Net Zero Building in Squamish, West Vancouver, or Whistler, contact First Peak Contracting and we can discuss options to help you create an energy-efficient home.