The Alberta insulation code, written out with the clause numbers attached.
7 reference pages for builders, designers, facility managers and producers working in central Alberta. Every value is transcribed from the National Research Council electronic editions of NBC(AE) 2023 and NECB 2020, from Alberta STANDATA, from CCMC evaluations or from manufacturers’ Canadian technical data — and every one is rendered with the clause, table or report it came from, so you can check it rather than take it on trust.
- Climate zone
- 7A · HDD18 5550
- Codes in force
- NBC(AE) 2023 · NECB 2020
- Adopted tier
- Tier 1 · since 1 May 2024
Seven questions this market answers badly.
The Zone 7A compliance page is the spine — it carries the prescriptive minimums that every other page refers back to. The rest each settle one question that comes up on a permit, in a specification, or in an argument about whether something can be sprayed in January.
NBC(AE) 2023 Tables 9.36.2.6.-A/-B and 9.36.2.8.-A
Alberta Code Compliance for Insulation — Climate Zone 7A
The prescriptive RSI minimums that apply in Red Deer under NBC(AE) 2023 Section 9.36 and NECB 2020, clause by clause, with RSI and R-value shown side by side.
Read Zone 7A code complianceSTANDATA 23-BCV-017 (September 2025)
Unvented Roofs in Alberta — STANDATA 23-BCV-017
Alberta now permits unvented Part 9 roof assemblies province-wide without a per-project engineering letter. What the variance requires, and the worked Zone 7A assembly behind it.
Read Unvented roofs (23-BCV-017)NBC(AE) 2023 · 9.25.4.2.(1) and (8)
How Thick Does Closed-Cell Foam Have to Be to Be a Vapour Barrier?
50 mm. The clause chain that gets you there, the measured permeance of nine Canadian products, and why open-cell never qualifies at any buildable thickness.
Read Vapour barrier thicknessCAN/ULC-S705.2 · CCMC 14230-R
Spraying Foam Through an Alberta Winter — Substrate Limits
Published substrate ranges by product grade, the dew-point and frost rules, pass-thickness limits — and the measured result showing winter grade loses essentially no R-value.
Read Winter application limitsNBC(AE) 2023 · 9.36.2.9 / 9.36.2.10 · NECB 2020 · 3.2.4
Alberta Air Barrier Requirements — Material vs Assembly
NBC(AE) 9.25.3.2 carries no numeric threshold. The material requirement arrives through 9.36.2.10.(1) and CAN/ULC-S741 — and NECB's commercial route is different again.
Read Air barrier requirementsNBC(AE) 2023 Division A · 1.1.1.1.(4)(a)
The Alberta Farm Building Exemption — and When You Lose It
Low-human-occupancy farm buildings are exempt from Alberta's building, energy and fire codes. Which means there is no code argument for barn insulation — only operational ones.
Read Farm building exemptionProgramme status verified 26 August 2026
Insulation Rebates in Red Deer — the Honest 2026 Position
Most of what competitors still list is closed. Every programme here carries a status label and a last-verified date, including the ones that pay nothing in Red Deer.
Read Rebates and incentives
Three rules, applied to every page.
01
Primary sources, not summaries
Code values are transcribed from the free NRC electronic editions. Several widely-copied “Canadian code” pages quote Ontario Building Code or NBC 2015 wording that Alberta no longer uses — the air barrier threshold being the best-known example. Where a figure comes from a secondary source, it is marked as such on the page.
02
Unverified facts are not published
The research behind these pages tags every fact verified, secondary or unverified. Anything that could not be confirmed against a primary source was left out rather than softened — including several figures that would have been convenient to publish.
03
Dated, because codes change
Every page shows the date its sources were last checked. Code editions get adopted, STANDATA are superseded, and incentive programmes close without notice. A technical page with no verification date is asking to be trusted longer than it should be.
These pages describe the code, the material standards and published test data. They are not a permit approval, not an engineering opinion, and not a statement about any particular contractor’s credentials. The authority having jurisdiction interprets and applies the code.
Bring the section drawing, not the brochure.
Framing depth, spacing, sheathing, finishes, whether there’s an HRV, and what the building is used for. That is enough to work the assembly against the clause and tell you where it lands — or to tell you that spray foam is the wrong answer for it.