Cold Storage.
A cold room inverts the assumption the code is written around. The warm side of that assembly is the building, not the room — which changes where vapour control belongs and makes it a design question rather than a default.
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Warehouse envelopes fail at the openings and cold rooms fail at the vapour direction. Neither failure is about R-value, and both are cheaper to think about before the panel goes up than after the floor starts heaving.
A warehouse kept just above freezing is a semi-heated building, and NECB reads the envelope table at a different degree-day base for those — the Zone 7A and Zone 6 figures side by side make the difference easy to see.
What Governs a Cold or Large Space.
Most of this is NECB 2020 rather than Part 9, and several of the relevant clauses are ones that never come up on a house.
- Above-ground assemblies, Zone 7A: walls at maximum U 0.215 (about R-26.4 effective), roofs at U 0.121 (about R-46.9), floors at U 0.138 (about R-41.2), from Table 3.2.2.2.
- The semi-heated route: Sentence 3.2.2.2.(2) has semi-heated buildings read the same table at a 15 °C degree day base. Red Deer's 4 570 HDD15 puts them in Zone 6 — walls 0.240, roofs 0.138, floors 0.156.
- Assemblies in contact with the ground, Zone 7A, from Table 3.2.3.1: below-grade walls and roofs at maximum U 0.284 (RSI 3.52), floors at U 0.757 over a 1.2 m perimeter strip (RSI 1.32).
- Sentence 3.2.3.1.(3): below-grade wall insulation extends 2.4 m down from ground level or to the bottom of the wall, whichever is less. Sentence 3.2.3.1.(5): where the top of footing is less than 0.6 m below grade, the same level goes on the top or bottom of the floor for at least 1.2 m from the perimeter.
- The vapour direction question. Sentence 9.25.4.3.(1) has vapour barriers protect the warm side, and Sentence 9.25.4.3.(3) requires a product serving as both insulation and vapour barrier to sit close enough to the warm side to prevent condensation at design conditions. In a cold room the warm side is the building, not the room — which is a design decision for whoever stamps the assembly, not a default we would apply on site.
- Closed-cell foam's material properties in this context: air permeance around 0.002 L/(s·m²) at 25 mm against a 0.020 limit, vapour permeance at or under 60 ng/(Pa·s·m²) at 50 mm, water absorption capped at 4 percent by volume.
- Airtightness by whole-building test at 1.50 L/(s·m²) at 75 Pa or by the 0.2 L/(s·m²) assembly route, with overhead doors at 2.0 and loading docks required to carry weather seals that seal the truck box to the building.
- The walk-in cooler and freezer exception in Sentence 9.10.17.10.(2), which excludes factory-built cooler and freezer panels from the thermal barrier requirement that applies to field-applied foam.
Scoping a Cold or Large Space.
- 01
Classify the building
Heated, semi-heated or refrigerated changes which column of Table 3.2.2.2 applies and, in the refrigerated case, which side of the assembly is warm. Getting this wrong at design stage is expensive to unwind.
- 02
Work the ground contact separately
Table 3.2.3.1 has its own numbers and its own extent rules — 2.4 m down the wall, 1.2 m in from the perimeter at the floor. Slab edge and perimeter detailing is where cold storage buildings most often lose the argument.
- 03
Deal with the openings
Dock doors, overhead doors and the truck-box interface are where a large building's air leakage actually is. NECB sets them explicitly, including the requirement for dock seals against the truck box.
- 04
Sequence around the refrigeration
Substrate temperature, dew point and moisture content have to be inside the product's range at the moment of spraying. In a space that is being brought down to temperature, timing that against the refrigeration commissioning is part of the scope.
Frequently Asked Questions About Cold Storage & Warehouse Insulation
Does a warehouse need as much insulation as an office?
It depends how it is conditioned. A fully heated Part 3 building in Red Deer reads NECB Table 3.2.2.2 at Zone 7A — walls at maximum U 0.215, roofs 0.121, floors 0.138. A semi-heated building, as defined in Sentence 1.2.1.2.(2), reads the same table at a heating degree day base of 15 °C under Sentence 3.2.2.2.(2), which for Red Deer is 4 570 HDD15 and therefore Zone 6: walls 0.240, roofs 0.138, floors 0.156. That is a real and rarely mentioned relaxation for warehouse and shop space kept above freezing but not to comfort temperature.Which side of a cold room does the vapour barrier go on?
The warm side, and in a cold room that is the outside — the building, not the room. The code language is direction-neutral: Sentence 9.25.4.3.(1) says vapour barriers shall protect the warm side of the assembly, and Sentence 9.25.4.3.(3) requires a product acting as both insulation and vapour barrier to be positioned close enough to the warm side to prevent condensation at design conditions. Working out where that is for a specific refrigerated assembly is a design question for the person responsible for the assembly. We will build what the design says; we will not assume the house-shaped answer applies.How far down does below-grade insulation have to go on a cold storage building?
Under NECB Sentence 3.2.3.1.(3), below-grade wall insulation extends 2.4 m down from ground level or to the bottom of the wall, whichever is less, at a maximum U of 0.284 W/(m²·K) for Zone 7A — RSI 3.52. Where the top of the footing is less than 0.6 m below grade, Sentence 3.2.3.1.(5) requires the same insulation level on the top or bottom of the floor for at least 1.2 m in from the perimeter. The floor itself is a perimeter-strip requirement rather than a whole-slab one: U 0.757 for 1.2 m.Is closed-cell foam suitable in a refrigerated space?
Its material properties suit the application — air permeance around 0.002 L/(s·m²) at 25 mm, vapour permeance at or below 60 ng/(Pa·s·m²) at 50 mm, water absorption capped at 4 percent by volume, and a rated service range from -60 to +80 °C. The engineering question is not whether the material is capable but where it sits in the assembly, because a low-permeance layer on the wrong face of a refrigerated wall is exactly how you build a condensing plane. That is settled on the drawing.Do walk-in coolers need the foam covered?
Factory-built walk-in cooler and freezer panels are excluded from the Article 9.10.17.10 thermal barrier requirement by Sentence (2). Field-applied foam in a room used as cold storage is not covered by that exception and is subject to the ordinary requirement to be protected from adjacent space, unless it sits in a genuinely concealed assembly. Which of the two you have is worth establishing before the insulation is specified.