Choosing the right insulation starts with understanding R-value. Here is what you need to plan insulation work in Quebec, straight to the point.
What is R-value?
R-value measures a material's thermal resistance: its ability to slow heat transfer. The higher the R-value, the better the material insulates. In Canada, it is expressed in imperial units (R) or metric units (RSI). On a jobsite, the target R-value depends on the building assembly, the climate and the requirements of the Quebec Construction Code. A batt only delivers its rated R-value when it is installed at full thickness, without compression and without air gaps.
Typical Quebec requirements by building assembly
For reference only, here are the orders of magnitude commonly seen in new residential construction in Quebec. Actual requirements vary by building type, municipality and the version of the Code in force.
| Above-grade walls | R-24.5 effective | Effective value of the full wall assembly, thermal bridging included, not just the cavity insulation. |
|---|---|---|
| Roof and attic | R-41 to R-60 | The attic is often the most cost-effective place to add insulation. |
| Foundation walls | R-17 effective | Plan for moisture management before insulating a foundation wall. |
How to choose the right R-value
Start with the assembly you are insulating: walls, attics and foundations have different targets. Then check the space available in the cavity: compressed insulation loses performance. Account for the complete assembly, including the thermal bridging created by the framing. Finally, adjust for the project: new construction, additions and renovations do not always face the same requirements. When in doubt about a code requirement, consult a professional: our job is to get you the right product, at the right price, at the right time.
Browse our insulation batts by R-valueWhy Owens Corning PINK fiberglass
Proven performance
A batt insulation used on North American jobsites for decades, with R-values that hold over time when installed correctly.
Fast installation
Batts sized for standard framing, easy to cut and fit. Your crews move fast, no specialized equipment required.
Non-combustible material
Fiberglass is naturally non-combustible. Check each product's data sheet for exact ratings.
Recycled content
Owens Corning fiberglass insulation contains a significant share of recycled glass. See the data sheets for certified percentages.
The basics of an install that performs
A batt delivers its rated R-value only when it fills the cavity without compression, without voids and without being forced around obstacles like electrical boxes and plumbing. The vapour barrier must be continuous on the warm side, in line with recognized practice and the Code. These principles are general reminders: always follow Owens Corning's installation instructions and the requirements that apply to your project.
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