Elastomeric Membrane Roof Cost in Montreal

Elastomeric membrane roofing consists of two layers: a base sheet and a cap sheet, both made of SBS (styrene-butadiene-styrene) modified bitumen. The SBS modifier gives the membrane rubber-like elasticity, allowing it to expand and contract with temperature changes without cracking or splitting. This property makes it particularly well-suited to Quebec's climate, where temperature swings between summer and winter can exceed 60 degrees Celsius. The cost of an elastomeric membrane installation depends on roof size, the condition of the existing roof, the number of details and penetrations, and whether additional insulation or slope correction is required. The two-layer system is applied by torch, with each layer heated and adhered to the substrate. Proper torch application requires experienced installers who understand how to achieve full adhesion without overheating the membrane. Existing roof condition is a major cost factor. If the current membrane is in poor condition with multiple patches, ponding areas, or blistering, a full tear-off is typically recommended. If the existing membrane is in reasonable condition, a re-cover may be possible, where new membrane is installed directly over the old. This saves the cost of tear-off and disposal but adds weight to the roof structure. Insulation can be incorporated into the membrane system using rigid insulation boards installed above the roof deck and below the membrane. This approach improves the building's thermal performance and can help create the slope needed for proper drainage. Parapet walls, drains, scuppers, plumbing vents, HVAC penetrations, and skylights all require careful detailing that adds to the project scope. Each detail is a potential failure point if not properly executed. [PRICING DATA TO BE RESEARCHED AND ADDED] Contact us for a free flat roof assessment. We inspect your existing system and recommend the most cost-effective approach.