Casey Grey went from a high-school construction class to a seven-year apprenticeship to founding one of Ottawa’s most-cited high-performance home builders. In 58 minutes on the Atlantic Construction Podcast, he maps the entire Canadian green-building certification stack — and argues that the bigger problem isn’t certifications, it’s that most builders have never been trained to read the stack at all.
If you have ever had a client wave the words net zero at you without being sure what they mean, this episode is the reference you needed. Casey Grey, founder of The Conscious Builder in Ottawa, does something rare on a construction podcast: he draws the full certification ladder in plain terms, from the legal floor to the performance ceiling, and explains exactly what each rung requires of the builder’s wall assemblies, windows, and mechanical systems. Then he makes a harder case — that Canada’s 2030 net-zero code trajectory will technically arrive on the back of solar panels, and that the existing housing stock and the training gap are the real problems nobody is funding.
The episode is dense with building science. Here is what a contractor takes from it.
Building code is the floor, not the target
Every conversation about high-performance building starts in the same place, and Casey names it plainly: “the building code is the worst home that you're allowed to build by law”. That’s the baseline. Energy Star sits roughly 20% above it. LEED adds a materials-and-process layer on top of energy (and skews heavily toward commercial). The Canadian Home Builders’ Association Net Zero program (CHBA) targets 30–40% better than code. R-2000 sits around 50%. Passive House — certified by the Passivhaus Institut (PHI) in Germany or Passive House Institute US (PHIUS) in North America — reaches roughly 80% or better.
The point isn’t to memorize percentages. It’s that each rung is third-party verified, not self-declared, and each one makes specific demands on how you build the envelope and spec the mechanical systems. Knowing where your client actually wants to land — and what that requires — is the whole job.
Canada’s building code is on a confirmed trajectory to reach net-zero energy-ready standards by 2030, through a five-tier National Building Code pathway established in 2020. Casey’s argument is that most builders will clear that bar via photovoltaic capacity added on top of a conventionally built shell, not because they’ve fundamentally changed how they frame, insulate, and seal — and that the mismatch between the code’s ambition and the industry’s actual skill set is the gap worth closing.
Orientation is a design variable, not a given
One of the more concrete lessons from Casey’s passive-house work: “if you were to take that house and put it on the other side of the road… it would not have got passable certification”. The same wall assembly, on a north-facing lot, fails certification without upgrading windows and R-values. South-facing orientation is not a nice-to-have in a passive-house design — it’s a variable that determines whether the thermal model closes at all.
This has practical implications at the site-selection and design phase. If your client is committed to passive-house certification, orientation needs to be settled before you spec the assembly, not after. Moving the house across the street on paper is free; upgrading to passive-certified window frames and higher R-values after the design is fixed is not.
On multi-unit buildings, the physics actually help: “the larger the building, the easier it is to get passive-house certification… it's a volume thing”. Interior party walls reduce exposed envelope; the volume-to-surface ratio improves with scale. If a passive-house project is on the table and it happens to be multi-unit, the certification math is meaningfully more forgiving than it is for a detached house.
The wall assembly is a moisture problem first
The certification numbers tell you the performance target. The assembly details are where things go wrong in the field, and Casey’s framing is useful: “it has to be something that can get wet and dry, not lose its R-value, not have mould”. In a thick double-stud wall, the assembly must be vapour-permeable and able to dry in both directions. Sealed foam inside a high-R double-stud wall traps moisture. That’s how you get mould behind a wall that passed inspection.
On windows, the variables that matter for high-performance certification are solar heat gain coefficient (SHGC), thermal breaks, and frame material — fiberglass frames are generally preferred over vinyl for passive-certified applications because of their thermal performance and dimensional stability in cold climates. On ICF, Casey is direct: “don't take the word from the ICF company about the fact that they have an R-50 wall assembly — it doesn't actually calculate that way”. Run the assembly through your energy advisor’s modelling software. Verify that the studs are thermally continuous during installation. Manufacturer R-value claims and as-built thermal performance are two different numbers.
Your envelope is skin; the ERV is lungs
The ventilation framing Casey uses is worth keeping: “we want to allow our envelope our skin to perspire but not breathe”. The envelope manages incidental moisture transfer. The ERV or HRV handles controlled fresh-air exchange. These are two different functions, and conflating them — by punching bathroom fans and oversized exhaust penetrations through a tight envelope — defeats the air-tightness strategy.
The range-hood number makes the point concrete. At −25°C, a 1,000-CFM kitchen range hood running full blast expels about 89,000 BTU/hr — the verified calculation from standard HVAC physics. “you lose 89,000 BTUs per hour by running that thousand-cfm range hood”. That is nearly five times the peak heating demand of a 4,000-sq-ft passive house, exhausted through a single penetration. In a tight house with fuel-burning appliances, an oversized exhaust fan is also a combustion-safety concern. The correct approach in a high-performance design is to size the kitchen exhaust to what the cooking load actually needs, not to the maximum the homeowner might imagine they want, and to eliminate redundant penetrations.
The EPA has ranked indoor air quality among the top five environmental health risks to the public — a fact that shapes how Casey talks about high-performance buildings with clients. The mechanical systems in a tight house are not a compromise on comfort; they are the reason the air inside is better than it would be in a leaky one.
Tell clients what the model says — and what reality will do
High-performance buildings behave differently from conventional ones, and some of those differences surprise clients post-occupancy. Passive houses can overheat on clear winter days when solar gain is high and the heating load is already nearly zero. Casey’s practice is to disclose this before the client moves in: “in theory what's going to happen but in reality this is likely what's going to happen based on our experience”. A client who opens a window on a sunny January afternoon because the house is too warm has already been told that will happen. A client who discovers it on their own posts it online.
The Integrated Design Process (IDP) is the mechanism for closing the gap between modelled and built performance. “you because everybody brings a different skill to the table… you need the whole team on board” — energy advisor, building scientist, contractor, and architect working from the same model from day one, not sequentially handing off a design that becomes progressively harder to change. What looks right on the architect’s energy model is often impractical or expensive for the framing crew to execute. Getting those conversations earlier is cheaper.
The training problem is bigger than any single project
The episode’s most pointed argument is about scale. The Conscious Builder builds a couple of high-performance houses per year — that’s the capacity constraint of a specialty residential builder. Casey’s view is that training other contractors is the higher-impact intervention: “we can only do a couple houses a year… the biggest potential is to help other contractors like us”. That thinking is what produced The Conscious Builder Academy, an online education platform for construction business owners covering high-performance building, business systems, and growth.
On association membership, the framing is similarly direct: “the guys sitting around that table weren't my competition… the guys that weren't a part of the association undercutting everyone”. The certified, trained, association-affiliated contractors at the table are not your competition. The operators who have never heard of vapour permeability and are quoting a fifth less because they don’t understand what they’re building — those are the competitive pressure. Association membership filters the comparison set.
The businesses doing this work
The Conscious Builder is an Ottawa-based custom home builder and renovator specialising in high-performance residential construction — Net Zero, Net Zero Ready, Passive House, off-grid, R-2000, and energy-retrofit homes. Through The Conscious Builder Academy, Casey also offers courses, handbooks, and group coaching for construction business owners who want to build and run high-performance shops.
Homesol Building Solutions is the building-science and energy-conservation consultancy mentioned in the episode — providing energy modelling, blower-door testing, EnerGuide ratings, and certification support for residential new construction and retrofits across Ontario and Atlantic Canada. Ross Elliott, a 40-year veteran of green building and energy advising who taught the Certified Passive House Consultant course at Ryerson University, formerly owned the firm.
If you are a builder in Atlantic Canada pricing your first high-performance project, the certification ladder Casey walks through is a practical reference — not because every client will want Passive House, but because knowing the full stack tells you what they’re actually asking for when they say net zero, and what it will cost to deliver it honestly.
Guest: Casey Grey, Founder, The Conscious Builder Inc. and The Conscious Builder Academy. Episode 22 of the Atlantic Construction Podcast. Watch the full episode. Also featured: Homesol Building Solutions. Source for the 2030 net-zero code trajectory: National Research Council Canada. Range-hood BTU calculation: Green Building Advisor. IAQ ranking: EPA Science Advisory Board studies.