Roof Insulation Cost in Montreal

Roof insulation costs depend on the type of insulation, the method of installation, the amount of coverage needed, and whether the work is being done as part of a re-roofing project or as a standalone upgrade. For pitched roofs with accessible attic spaces, the most common insulation methods are blown-in cellulose or fiberglass, fiberglass batt installation, and spray polyurethane foam. Blown-in insulation is effective for filling existing attic cavities and can be installed over existing insulation to increase the total R-value. Spray foam provides both insulation and air sealing in a single application, making it particularly effective for stopping heat loss and preventing ice dams. For flat roofs, insulation is typically installed as rigid board above the roof deck during a membrane replacement. Polyisocyanurate (polyiso), extruded polystyrene (XPS), and expanded polystyrene (EPS) are the common rigid insulation materials used in flat roof assemblies. Tapered insulation systems can serve double duty by adding thermal resistance and creating the slope needed for proper drainage. The current Quebec building code specifies minimum insulation values for roof assemblies, and these requirements have increased over time. When a roof is being replaced, it is often required or strongly recommended to bring the insulation up to current code levels. This adds cost to the roofing project but delivers long-term energy savings and improved comfort. Ice dam prevention is one of the most important benefits of proper roof insulation in Quebec. Ice dams form when heat escaping through the roof melts snow on the upper portion of the roof, and the meltwater refreezes at the cold eaves. Adequate insulation and ventilation keep the roof surface cold and uniform, preventing this cycle. [PRICING DATA TO BE RESEARCHED AND ADDED] Contact us to discuss insulation options for your roof. We assess your current insulation and recommend the most effective upgrade path.