Flat Roofing Built to Last
WPG Roofing is an Authorized Membrane Applicator — the gold standard for SBS modified bitumen flat roofing in your area. Residential and commercial. $5M liability insured.
- In business since 2015
- Fully Insured
- Licensed & Insured
- Written Workmanship Warranty
Flat roofing in your area demands a system engineered for the extremes — not just rain, but freeze-thaw cycles, ice load, and UV degradation that would destroy a lesser membrane in a few seasons. WPG Roofing uses a premium SBS modified bitumen system, installed by an Authorized Membrane Applicator, to deliver flat roofs that hold up for decades.
What's Included in a Flat Roof Replacement
- Complete tear-off of existing membrane and insulation
- Deck inspection and structural repairs before installation begins
- Vapour barrier installation
- Rigid insulation for thermal performance
- SBS base sheet installation
- SBS cap sheet installation — torch-applied or cold-applied to spec
- All flashings and terminations detailed and sealed
- Written workmanship warranty on completion
Authorized Membrane Applicator
Premium Membrane Manufacturer is one of the world's leading manufacturers of SBS modified bitumen roofing membranes. The authorized applicator designation means WPG Roofing's crew has completed the manufacturer's installation training program and meets the quality standards required to install systems under full manufacturer warranty. Not every roofing contractor qualifies.
Manufacturer Warranty Coverage
- 100% materials coverage — membrane defects covered
- 100% labour coverage through workmanship warranty
- Flashings and terminations included
- Coverage for both residential and commercial installations
- Transferable to next property owner
- Backed by the manufacturer's guarantee
The Complete Premium Flat Roofing System
SBS Cap Sheet
The top membrane layer — UV-resistant, flexible in cold temperatures, and the primary waterproofing surface.
Rigid Insulation
High-density insulation board that provides thermal resistance and a stable base for the membrane system.
SBS Base Sheet
The reinforced base layer that bonds to the deck and provides the foundation for the cap sheet above.
Drainage & Slope
Tapered insulation or crickets installed where needed to ensure positive drainage — no standing water.
Vapour Barrier
Installed directly on the deck to prevent warm interior air from condensing inside the roof assembly.
Flashings & Terminations
All perimeters, penetrations, drains, and transitions detailed and sealed — the most failure-prone areas, done properly.
Signs Your Flat Roof Needs Attention
Catch a flat roof problem early and a repair may be all you need. Ignore it and a small blister becomes a full replacement. We'll give you a straight answer.
- Standing water remaining 48+ hours after rain
- Bubbles or blisters in the membrane surface
- Cracks, splits, or open seams in the membrane
- Membrane pulling away from walls or flashings
- Water stains on interior ceilings below the roof
- Granule loss on the cap sheet surface
- Roof is 15–20+ years old
- Recent extreme hail event
WPG Roofing handles both residential and commercial flat roofing. Our $5M liability insurance and full coverage mean commercial property managers can engage us with confidence.
Get a Free Assessment
No pressure, no obligation. We'll give you a straight answer about what your home needs.