Great West

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Flat Roofing Across Lower Mainland BC

Protect your commercial or residential property with expert flat roofing systems engineered for BC’s demanding climate. Serving Vancouver, Surrey, Burnaby, Langley, Richmond, and 21+ communities across the Lower Mainland since 2010. We deliver professional flat roof installation backed by comprehensive warranties covering materials and labour for up to 25 years.
  • $0 Down Financing | Commercial & Residential Solutions
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(778) 654-8629

Why Choose Great West for Your Flat Roofing

15+ Years of Flat Roofing Expertise

We’ve installed flat roofs across the Lower Mainland since 2010, from Vancouver to Fraser Valley, specializing in low-slope systems built to withstand BC’s heavy rain, temperature changes, and harsh weather.

Certified Flat Roofing Specialists

Our crews hold PAQ-S and GAF Master Elite certifications, ensuring manufacturer-approved installation, precise membrane application, and industry-leading roofing warranties access.

Comprehensive Warranty Protection

Your flat roof is protected for up to 25 years on materials and up to 15 years on labour. These warranties cover membrane integrity, seam failures, and installation defects for complete peace of mind.

Advanced Membrane Systems

We install cutting-edge flat roofing systems including TPO, EPDM, PVC, modified bitumen, and built-up roofing designed specifically for low-slope applications and ponding water management.

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When You Need Flat Roofing

Commercial Properties

  • Office buildings and retail centers
  • Warehouses and industrial facilities
  • Multi-family apartment buildings
  • Restaurants and hospitality properties
  • Medical and professional buildings

Residential Applications

  • Modern architectural homes with flat sections
  • Garage and carport roofing
  • Deck and balcony waterproofing
  • Home additions and extensions
  • Rooftop patio installations

New Construction Projects

  • Ground-up commercial developments
  • Residential flat roof designs
  • Mixed-use building projects
  • Institutional and government facilities
  • Green roof and solar-ready installations

Replacement & Restoration

  • Aging flat roof replacement
  • Leak repair and membrane restoration
  • Upgrading to superior membrane systems
  • Improving drainage and performance
  • Energy efficiency improvements
If you’re building new or replacing an existing flat roof, professional installation ensures optimal drainage, waterproofing, and longevity.
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Our Professional Flat Roofing Process

Comprehensive Roof Assessment

We evaluate roof structure, load capacity, dimensions, materials, drainage, penetrations, equipment locations to determine optimal flat roofing system selection process.

System Selection Guidance

Expert flat roofing membrane recommendations based on building type climate budget traffic performance warranties energy efficiency and long-term value considerations

Expert Installation

Certified crews install roofing using approved methods including tear-off, inspection, insulation, membranes, flashing, drainage optimization, quality checks within 5-10 days.

Quality Verification & Warranty Registration

We conduct final inspection verifying seams, waterproofing, drainage, register warranties, and provide complete documentation reports.

Flat Roofing or Sloped Roofing? How to Decide

  • Choose Flat Roofing When
  • Building modern architectural designs
  • Maximizing usable interior space
  • Installing rooftop equipment or HVAC
  • Creating rooftop patios or green roofs
  • Working with commercial buildings
  • Budget requires cost-effective solutions
  • Solar panel installation is planned
  • Choose Sloped Roofing When
  • Traditional aesthetics suit your design
  • Natural drainage is priority
  • Residential construction is standard
  • Snow load shedding is critical
  • Long-term maintenance concerns exist
  • Local regulations favor pitched roofs
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Not sure which roofing type suits your project?

Our free assessment provides honest evaluation based on your building type, budget, performance requirements, and long-term maintenance considerations.

Financing Made Easy for Your Flat Roofing

  • Quality flat roofing protects your property investment and prevents costly water damage. We partner with trusted financing providers to offer flexible payment solutions:
  • $0 down payment options
  • Flexible payment terms
  • Same-day approval
  • Competitive rates
  • No prepayment penalties
  • Install professional roofing now, pay over time
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Flat Roofing Solutions Built for BC Weather

Coastal Areas (Vancouver, Burnaby, Richmond)

Heavy rain and humidity require waterproof membranes, reinforced seams, efficient drainage, ponding control, and algae-resistant flat roofing designed for 1,200mm+ annual rainfall conditions systems installed.

Fraser Valley (Surrey, Langley, Abbotsford)

Flexible membranes handle temperature swings from -10°C to +35°C, maintaining seal integrity through extreme weather cycles while insulation improves energy efficiency systems performance reliability ensured.

Mountain Communities (Squamish, Whistler)

Heavy snow and freeze-thaw conditions require reinforced membrane roofing with tapered insulation for drainage, ice-and-water protection, heat trace compatibility, and engineered snow load capacity systems.

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Strata & Multi-Family Building Flat Roofing Services

We collaborate with property managers, strata councils, and developers to deliver comprehensive flat roofing solutions:

  • Detailed scope documentation for council approval
  • Building envelope assessment and recommendations
  • Resident communication and scheduling coordination
  • Phased installation to minimize tenant disruption
  • Budget planning and cost optimization
  • Complete warranty documentation and transfer
  • Preventive maintenance program development

Projects range from small townhouse complexes to 50+ unit apartment buildings and commercial properties.

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Flat Roofing Systems We Install

TPO Membrane Roofing

Industry-leading option with 20-25 year lifespan, heat-welded seams for superior waterproofing, excellent UV resistance, ideal commercial and residential applications buildings.

EPDM Rubber Roofing

Proven performance with 20-30 year lifespan, exceptional weather resistance, cost-effective installation, and reliable waterproofing. Best choice for budget-conscious projects and residential flat roofs.

PVC Membrane Roofing

Premium option delivering 25-30 year lifespan, chemical and fire resistance, heat-welded seams, and superior durability. Ideal for restaurants, industrial facilities, and high-performance applications.

Modified Bitumen Roofing

Traditional option offering 15-20 year lifespan, torch-applied or cold-adhesive installation, excellent puncture resistance, and proven BC climate performance. Suitable for residential and light commercial applications.

Built-Up Roofing (BUR)

Time-tested system with 20–25 lifespan, multiple waterproofing layers, gravel or cap sheet finish, offering exceptional durability for heavy-traffic commercial buildings.

Green Roof Systems

Sustainable option combining waterproofing membrane with vegetation layers. Offers stormwater management, energy efficiency, urban heat reduction, and environmental benefits.

Spray Foam Roofing

Seamless insulation and waterproofing system offering superior R-value, self-flashing properties, and lightweight application. Ideal for complex roof geometries and energy efficiency upgrades.

Tapered Insulation Systems

Engineered sloped insulation drainage system eliminates ponding water, improving flat roof performance, energy efficiency, and ensuring effective positive water runoff.

SERVICE AREA

Don’t let budget concerns delay your roofing project. We offer financing with

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Customer Reviews

Trusted by Homeowners Across the Lower Mainland
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Frequently Asked Questions

Flat roofing costs vary by membrane type, roof size and complexity, insulation requirements, and drainage modifications. Commercial projects typically range $8-$15 per square foot installed. TPO and PVC cost more than EPDM or modified bitumen. We provide free, detailed estimates with transparent pricing.
TPO membrane roofing offers optimal performance for most Lower Mainland commercial buildings with superior waterproofing, energy efficiency, and longevity. EPDM works well for residential applications and budget-conscious projects. We recommend systems based on your specific building type and requirements.
Quality flat roofing lasts 20-30 years depending on membrane type, installation quality, drainage effectiveness, and maintenance. TPO and PVC typically last 20-25 years. EPDM can exceed 30 years. Regular inspections and maintenance extend lifespan significantly.
We install tapered insulation systems that create positive drainage toward roof drains and scuppers. Proper slope design (minimum 1/4″ per foot) eliminates standing water. We assess existing drainage patterns and engineer solutions for ponding elimination.
Yes. Properly installed flat roofing systems with adequate drainage handle 1,200mm+ annual rainfall effectively. We install reinforced membranes with heat-welded seams, multiple drains for redundancy, and overflow scuppers for extreme weather events.
Flat roofs benefit from annual inspections and preventive maintenance including drain cleaning, seam inspection, and minor repairs. This proactive approach prevents major issues and extends roof lifespan. We offer maintenance programs for commercial properties.
Absolutely. Flat roofs are ideal for solar panel installation. We install solar-ready roofing systems with reinforced membrane, proper flashing for panel mounts, and ballasted or mechanically-attached racking systems that don’t compromise waterproofing.
Most commercial flat roofing projects complete in 5-10 days depending on roof size, complexity, and weather conditions. Residential flat roofs typically complete in 2-4 days. We schedule work during suitable weather windows for optimal membrane adhesion and sealing.

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No obligation. No pressure. Just expert evaluation and honest recommendations for professional flat roofing solutions.
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Commercial Property Owner?

Professional flat roofing assessment identifies optimal membrane systems, drainage improvements, and cost-effective solutions for your building.

Flexible Financing Available

  • $0 down options with same-day approval. Install quality flat roofing now, pay over time.
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(778) 654-8629