Flat Roof Specialists — SOPREMA & EPDM Systems
Montreal's Leading Flat Roof Installation Specialists
What Is an Elastomeric Membrane Roofing System?
An elastomeric membrane is a high-performance roofing system engineered specifically for flat or low-slope surfaces. The membrane is composed of modified bitumen reinforced with polymer technology — providing exceptional elasticity, superior waterproofing properties, resistance to cracking, and long-term flexibility in extreme temperatures.
This flexibility allows the membrane to accommodate structural movement and seasonal expansion without compromising waterproof integrity — critical in Quebec's demanding climate.
Two-Layer Membrane System Structure
A professional elastomeric roofing system is installed in two integrated layers — each with a critical role in long-term waterproofing performance.
Base Layer — Underlay Membrane
The base membrane ensures structural adhesion to the roof deck while providing foundational waterproofing support. It stabilizes the system and prepares the surface for the protective top layer.
Cap Sheet — Top Membrane
The upper membrane acts as the primary weather barrier, protecting against:
- ✓ UV radiation
- ✓ Snow and ice accumulation
- ✓ Wind-driven rain
- ✓ Thermal expansion and contraction
- ✓ Surface wear and aging
Often finished with mineral granules for enhanced UV resistance and durability.
Advantages of Elastomeric Flat Roofing
Exceptional Longevity
When installed correctly, elastomeric membrane systems can perform reliably for 25 to 30 years or more.
Superior Weather Resistance
Designed for Quebec's climate — protection against heavy snowfall, ice dam formation, intense rainfall, UV exposure, and freeze-thaw expansion.
Structural Flexibility
Polymer-modified bitumen maintains elasticity in both extreme cold and high heat, reducing cracking and seam failure over decades of use.
Efficient Repairs & Maintenance
Flat membrane systems allow for localized repairs when necessary — minimizing long-term maintenance costs and avoiding premature full replacement.
Clean Architectural Appearance
Available in multiple finishes and colors, elastomeric membranes integrate seamlessly with residential extensions, commercial properties, and multi-unit buildings.
Code-Compliant Installation
Every installation completed under RBQ licensing and in strict accordance with Quebec Construction Code requirements — ensuring compliance and structural protection.
Leading Material Manufacturers
We install elastomeric membrane systems from recognized industry manufacturers. All materials installed according to manufacturer guidelines to preserve product warranty eligibility.
Membrane Systems We Install
We install flat roof membrane systems from the most trusted manufacturers in the industry — each selected for proven performance in Quebec's climate.
SOPREMA Sopralene Flam 180 FR
Quebec Industry StandardSBS-modified bitumen membrane applied by torch — Quebec's most trusted elastomeric membrane system. Class A fire-rated, with outstanding cold-temperature flexibility down to -25°C. The Sopralene Flam 180 FR is the benchmark cap sheet for 2-ply flat roof systems on Montreal duplexes, triplexes, and commercial buildings. Superior adhesion, granule finish for UV resistance, and a 20-25 year service life when properly installed.
- ✓ SBS-modified bitumen
- ✓ Torch-applied heat-welded
- ✓ Class A fire-rated
- ✓ Rated to -25°C cold performance
- ✓ Quebec's trusted standard
- ✓ 20-25 year service life
Firestone RubberGard EPDM
50+ Year Track RecordSingle-ply EPDM (ethylene propylene diene monomer) rubber membrane with over 50 years of proven performance. Excellent low-temperature flexibility and UV resistance — EPDM maintains integrity across Montreal's full seasonal temperature range. Ideal for large flat commercial roofs and low-slope residential applications. Available in 45 and 60 mil thicknesses.
- ✓ EPDM rubber single-ply
- ✓ 50+ year track record
- ✓ Superior low-temp flexibility
- ✓ UV and ozone resistant
- ✓ 45 & 60 mil thicknesses
- ✓ Proven on large commercial roofs
Signs Your Roof May Need Replacement
Flat Roofing Services Available In
Every elastomeric roofing installation by Castelli & Carson Construction is: