Polyurethane Insulation for Cathedral Roofs
A cathedral-style roof presents unique insulation challenges: the limited space between the interior finish and the exterior covering leaves little room for error. Poorly installed insulation can lead to energy inefficiency, condensation issues, or even structural damage due to inadequate ventilation.
Toiture Simon Lefebvre specializes in the complete renovation of cathedral roof insulation using spray polyurethane foam, an insulator that offers superior performance and waterproofing.
Your cathedral roof deserves insulation that matches the value of your investment.
Let’s discuss your project.
A Comprehensive Process,
from Roofing to Insulation
Unlike simply adding insulation, this type of project requires a complete roof renovation to access the space to be insulated and ensure proper ventilation.
Removal
We remove the existing roof covering (shingles, metal sheeting, or membrane), the underlying plywood or boards, and the existing insulation (wool, Styrofoam, etc.).
Bringing Ventilation up To Code
We double the rafters in the roof trusses to create an air gap of at least 2.5 inches, in accordance with Section 9.19.1.3 of the Construction Code. We then install fibreboard at the base of the ceiling.
Insulation Application
Spray-applied polyurethane is sprayed to a thickness of 6 to 7 inches, ensuring continuous insulation and excellent airtightness.
Closure and Waterproofing
The roof is closed off with half-inch-thick Aspenite sheets. We then fabricate custom aluminum starter strips to compensate for the roof’s pitch, as well as a custom-made ventilated ridge extending 24 inches on each side for optimal ventilation. A high-performance Résisto membrane is then installed over the entire surface.
Finishing and Cleanup
We install the final roofing material (shingles, metal roofing, or low-slope membrane, depending on your choice), followed by a thorough cleanup of the site and disposal of debris.
The Benefits of Sprayed Polyurethane Foam
- Superior energy efficiency
- Better airtightness
- Reduced risk of condensation
- Optimized ventilation, compliant with the Construction Code
Frequently Asked Questions About Cathedral Roof Insulation
What Sets Spray Polyurethane Apart From Traditional Insulation Materials Like Wool or Styrofoam?
Spray-applied polyurethane conforms perfectly to surfaces and seals gaps, providing better airtightness than traditional insulation materials. This reduces heat loss and improves the roof’s overall energy efficiency.
Why Is an Air Gap Necessary in a Cathedral Roof?
The air gap allows for proper ventilation between the insulation and the roof covering, which prevents moisture buildup and complies with Construction Code requirements.
Does This Service Include Replacing the Roof Covering?
Yes! Since accessing the space to be insulated requires removing the existing roofing material, our service includes a complete roof renovation, including the installation of new roofing material at the end of the project.
How Long Does a Cathedral Roof Insulation Renovation Project Take?
The duration varies depending on the roof’s surface area and the scope of the work. We establish a clear timeline from the start so you can plan accordingly.
Your Polyurethane Insulation Expert
The Toiture Simon Lefebvre team combines our expertise in roofing and insulation to provide you with a high-performance, long-lasting result. Throughout a 30-km radius of Sainte-Agathe-des-Monts, we are your trusted partner.
