Flat Roof — Membrane Experts
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.
Signs Your Roof May Need Replacement
Flat Roofing Services Available In
Montreal
- ✓ Ahuntsic-Cartierville
- ✓ Anjou
- ✓ Côte-des-Neiges–NDG
- ✓ LaSalle
- ✓ Lachine
- ✓ Le Sud-Ouest
- ✓ Mercier–Hochelaga-Maisonneuve
- ✓ Outremont
- ✓ Pierrefonds-Roxboro
- ✓ Plateau-Mont-Royal
- ✓ Rosemont–La Petite-Patrie
- ✓ Saint-Laurent
- ✓ Saint-Léonard
- ✓ Verdun
- ✓ Ville-Marie
- ✓ Villeray–Saint-Michel–Parc-Extension
West Island
- ✓ Pointe-Claire
- ✓ Dorval
- ✓ Beaconsfield
- ✓ Kirkland
- ✓ Dollard-des-Ormeaux
- ✓ Sainte-Anne-de-Bellevue
- ✓ Baie-D'Urfé
- ✓ Senneville
Laval
- ✓ Chomedey
- ✓ Sainte-Dorothée
- ✓ Laval-des-Rapides
- ✓ Duvernay
- ✓ Auteuil
- ✓ Sainte-Rose
- ✓ Fabreville
South Shore
- ✓ Longueuil
- ✓ Brossard
- ✓ Saint-Lambert
- ✓ Boucherville
- ✓ La Prairie
- ✓ Candiac
- ✓ Châteauguay
- ✓ Saint-Constant
- ✓ Delson
Vaudreuil Region
- ✓ Vaudreuil-Dorion
- ✓ Saint-Lazare
- ✓ Hudson
- ✓ Rigaud
- ✓ Pincourt
- ✓ Notre-Dame-de-l'Île-Perrot
- ✓ L'Île-Perrot
- ✓ Terrasse-Vaudreuil
Every elastomeric roofing installation by Castelli & Carson Construction is:
Flat Roof FAQ
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