Long-Lasting Waterproofing for Residential and Commercial Roofs
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Frequently Asked Questions
Roof deck waterproofing is the application of a continuous, fully sealed membrane or coating system over a flat or low-slope roof surface to prevent water from penetrating through to the structure below. In Edmonton, flat roofs and deck roofs face significant waterproofing challenges due to spring snowmelt creating sustained water pooling, freeze-thaw cycling that expands and contracts roofing materials, UV degradation during Edmonton’s intense summer sun, and wind-driven rain. Without a properly installed waterproofing system, water infiltrates through cracks, seams, and flashing failures, causing damage to insulation, roof decking, framing, and interior finishes. CBS Alberta specializes in Flexstone waterproofing systems engineered specifically for Edmonton’s demanding climate.
CBS Alberta’s primary flat and deck roof waterproofing system is Flexstone — a high-performance, 100% waterproof, traffic-rated coating membrane. Flexstone is applied as a liquid coating that cures into a seamless, flexible waterproof layer that bonds directly to the roof substrate. Because it has no seams or joints, it eliminates the primary failure points of traditional felt or membrane roofing systems. Flexstone is UV-stable, slip-resistant, flexible enough to handle Edmonton’s extreme temperature cycling without cracking, and available in multiple colour options. It is suitable for both residential flat roofs and commercial deck roof applications throughout the Greater Edmonton Area.
A professionally installed Flexstone roof deck waterproofing system by CBS Alberta is designed to provide 15 to 25 years of reliable waterproofing protection in Edmonton’s climate. The longevity of the system depends on the quality of the installation, the condition of the substrate at the time of application, and regular maintenance including annual inspections and prompt attention to any edge or flashing details that may require touch-up over time. Compared to traditional modified bitumen or torch-on roofing systems, Flexstone’s seamless membrane eliminates the seam failures and granule loss that commonly lead to earlier replacement needs in Edmonton’s harsh weather environment.
CBS Alberta applies Flexstone waterproofing to a range of flat and low-slope roof types in Edmonton. This includes residential flat roofs over living spaces or walkout basements, rooftop patios and terraces, exposed deck roofs over garages or carports, balconies and covered decks where waterproofing the surface protects the space below, and commercial flat roof applications on low-rise buildings and property developments. CBS Alberta assesses the existing roof substrate, drainage design, and structural condition before recommending the appropriate Flexstone system for each specific application.
Signs your flat or deck roof in Edmonton needs waterproofing attention include water stains or active leaks on interior ceilings below the roof, blistering, bubbling, or cracking of the existing roof surface, visible ponding of water that remains for more than 48 hours after rain or snowmelt, deteriorating flashing at walls and edges, and a roof surface that is approaching or past its expected service life. CBS Alberta offers free roof deck assessments to evaluate the condition of your existing system and determine whether targeted waterproofing, a full Flexstone overlay, or substrate repairs are required before coating can proceed.
In many cases, yes. CBS Alberta can apply Flexstone waterproofing over an existing flat roof surface without a full tear-off, provided the substrate is structurally sound, properly bonded, and free of significant moisture infiltration or rot. Before application, the existing surface must be cleaned, primed, and any failed areas repaired to ensure proper adhesion of the Flexstone membrane. Installing over an existing surface can reduce project cost, minimize disruption, and avoid landfill waste. CBS Alberta’s team assesses your roof during the quoting process to determine if an overlay is appropriate or if substrate remediation is required first.
Yes. CBS Alberta installs Flexstone waterproofing systems on commercial flat roofs and deck roofs throughout Edmonton and the Greater Edmonton Area. Commercial applications include low-rise office and retail buildings, multi-unit residential properties, commercial condominiums, and property developments requiring reliable, low-maintenance flat roof waterproofing. Flexstone’s seamless application, traffic-rated durability, and long service life make it well-suited to commercial roofing requirements, and CBS Alberta works with property managers and developers to schedule installations with minimal disruption to building operations.
Getting a free roof deck waterproofing quote from CBS Alberta is simple. Call 780-399-4998, email info@cbsalberta.com, or fill out the request form at cbsalberta.com/roof-decks/. CBS Alberta will arrange a site visit to inspect your flat or deck roof, assess the substrate condition and drainage, discuss your waterproofing needs, and provide a clear, transparent estimate at no obligation. Their team will explain the Flexstone system in detail and answer any questions about the installation process, timeline, and expected performance life for your specific Edmonton property.