In-depth information to help you make informed decisions about strata roofing for your property.
Flat Roof Systems: SBS, TPO, and EPDM Compared
Flat roofs dominate commercial and multi-story Strata buildings in the Lower Mainland, and selecting the right membrane system is critical to achieving decades of leak-free performance. The three most common flat roofing systems each have distinct characteristics that make them suitable for different applications. SBS (Styrene-Butadiene-Styrene) modified bitumen is the most widely used commercial roofing system in BC, valued for its excellent waterproofing performance, puncture resistance, and proven track record spanning 40+ years. SBS membranes are applied in multiple layers using torch application or self-adhesive installation, creating a robust, redundant waterproofing system. Most SBS systems carry manufacturer warranties of 15-20 years, with properly maintained roofs often lasting 25-30 years. TPO (Thermoplastic Polyolefin) single-ply membrane has gained significant market share in recent years due to its energy-efficient white surface, chemical resistance, and relatively fast installation. TPO seams are heat-welded, creating homogeneous bonds that are stronger than the membrane itself. TPO systems are lighter than SBS, making them suitable for buildings with limited structural capacity. EPDM (Ethylene Propylene Diene Monomer) rubber roofing is valued for its flexibility, UV resistance, and very long service life — EPDM membranes installed 40+ years ago remain in service today. EPDM is particularly well-suited to roofs with complex shapes or numerous penetrations, as its flexibility accommodates building movement and makes detail work straightforward.
Roof Maintenance Programs: Protecting Your Investment
A comprehensive roof maintenance program can extend the service life of a roofing system by 5-10 years, deferring the significant capital expense of roof replacement and protecting the building from the costly water damage that results from neglected leaks. Our maintenance programs include semi-annual inspections (spring and fall), with additional inspections after major weather events. Spring inspections focus on identifying winter damage, clearing debris from drains and gutters, and evaluating membrane condition after freeze-thaw cycles. Fall inspections prepare the roof for winter by ensuring all drains are clear, flashings are secure, and the membrane is in good condition to handle the heavy rainfall season. Maintenance activities typically include clearing vegetation and debris from roof surfaces and drains, re-securing loose flashings and edge metal, sealing minor membrane cracks or blisters before they become leaks, re-caulking sealant joints around penetrations, clearing and testing roof drains and overflow devices, and documenting overall roof condition with photographs and condition ratings. For Strata corporations, our maintenance programs provide the documentation needed for reserve fund planning, insurance renewals, and council reporting. Annual condition reports track the roof's deterioration over time, enabling accurate projections of remaining service life and replacement timing.
Understanding Roof Drainage and Why It Matters
Proper drainage is the single most important factor in flat roof longevity. Standing water — known as ponding — accelerates membrane deterioration through UV degradation, freeze-thaw damage, and the additional structural load of accumulated water weight. A single inch of standing water on a 10,000 square foot roof adds over 26 tons of weight that the structure was not designed to carry. BC Building Code requires flat roofs to achieve positive drainage, typically defined as complete water evacuation within 48 hours of rainfall cessation. Achieving this requires properly designed drainage systems including interior roof drains, scupper outlets, or a combination of both, plus tapered insulation that creates slope toward drain locations. Our roofing installations use tapered insulation systems engineered to provide minimum 2% slope (1/4 inch per foot) toward all drain locations, with cricket and saddle configurations used to direct water around rooftop equipment and penetrations. We also install overflow drains or scuppers as secondary drainage that protects against primary drain failure — a code requirement that prevents catastrophic structural overload during blocked-drain conditions. For existing roofs with ponding problems, solutions range from additional drain installations and re-grading with tapered insulation to scupper additions and pump-out systems. Our assessments identify ponding areas using aerial photography and site measurements, and we recommend cost-effective solutions to restore proper drainage.
Emergency Roof Repairs: What to Do When Your Roof Leaks
A roof leak in an occupied building is an emergency that requires prompt professional response to prevent interior damage, protect contents, and address the source of water intrusion. At Strata Property Services, we provide emergency roof repair service for active leaks on commercial, Strata, and residential properties. When you discover a roof leak, take these immediate steps: place containers under active drips to protect flooring and contents, move valuables and electronics away from the affected area, take photographs of the leak location and any visible damage for insurance purposes, and contact us for emergency service. Our emergency response includes temporary waterproofing of the leak source using appropriate materials (bituminous patches, temporary membrane applications, or emergency tarping for larger areas), followed by investigation to identify the root cause. Many leaks originate not at the obvious drip location but at a penetration, flashing failure, or membrane defect some distance away, with water traveling along the roof deck or through insulation before appearing at the ceiling below. Permanent repair is scheduled after the emergency stabilization, with a detailed scope of work based on our root-cause investigation. We coordinate with Strata insurance adjusters when water damage claims are involved, providing professional documentation of the leak source, timeline, and repair scope.
Planning a Roof Replacement: Timeline, Cost, and Decision Framework
Roof replacement is typically the largest single capital expenditure a Strata corporation will undertake, and proper planning can save tens of thousands of dollars while ensuring the best possible outcome. The planning process should begin 2-3 years before the expected replacement date, allowing time for assessment, budgeting, engineering, contractor selection, and scheduling. Key decision points in the planning process include replacement timing (replace proactively before leaks begin, or extend life with targeted repairs?), system selection (which membrane technology offers the best value for this building?), scope of work (full removal to deck, or overlay on existing membrane where conditions permit?), energy efficiency (should insulation be upgraded to current code requirements during replacement?), and ancillary work (should HVAC equipment, drains, or other rooftop components be upgraded concurrently?). Budget expectations should include the roofing work itself, scaffolding and safety provisions, engineering and consulting fees, contingency for unforeseen conditions, and project management. We recommend a 10-15% contingency allowance for roofing projects to cover unexpected deck repairs, additional drain work, or weather delays. For Strata corporations with reserve fund requirements, our assessment reports provide the replacement cost estimates and timing projections needed for depreciation report updates.
