Flat and low-slope roofs fail for one main reason: water that should drain does not. Active Roofing installs and repairs torch-on, TPO, and EPDM flat roofing systems for homes, commercial buildings, and multi-family properties across Surrey, with the slope, drainage, and seam detail that determine whether a flat roof lasts decades or leaks within a few years.
Free, no-obligation. We inspect, then quote in writing.
🔒 Free & no-obligation · Residential & commercial
A properly installed flat roof system, with the right slope and drainage, is the difference between decades of service and repeat leak repairs. See the difference proper installation makes.
Flat roofing is not one material. Each system has a different cost, lifespan, and best use case.
A heat-applied, multi-layer asphalt membrane system and a common standard for residential and smaller commercial flat roofs. Torch-on is fully bonded with redundant layers and stays flexible through freeze-thaw conditions, generally lasting 20 to 25 years.
Multi-layer · 20–25 yrsA single-ply, heat-welded membrane suited to larger commercial roofs. TPO’s welded seams tend to hold up particularly well over time in wet, moisture-heavy climates like ours, and its white reflective surface can reduce cooling costs on larger buildings.
Single-ply · commercialA proven, durable rubber membrane with adhesive-seamed installation. EPDM has a long track record and a strong lifespan when installed and maintained correctly, though seam integrity depends heavily on installation quality and drainage.
Rubber membrane · provenBuilt-up roofing, the traditional multi-layer tar and gravel system, still used on some commercial properties. It offers solid durability but has largely been replaced by modern membrane systems on new installations.
Traditional · commercialNo flat roof is perfectly flat. Building code requires a minimum slope toward drains, and the single biggest factor in how long a flat roof lasts is whether water actually leaves the roof after it rains. Water that stands for more than 48 hours after rainfall, known as ponding, accelerates membrane breakdown, adds structural load, and drives freeze-thaw damage at the surface. Insufficient slope, clogged drains, or a structural low spot are the usual causes.
We assess drainage as part of every flat roofing estimate. Where ponding is a problem, tapered insulation is generally the permanent fix, it corrects the slope across the whole roof rather than patching individual low spots. Getting the drainage and slope right the first time is the difference between a flat roof that lasts its full rated lifespan and one that needs constant leak repairs.
Flat roofing carries more risk in a wet coastal climate than in a dry one, simply because there is more water to manage. Surrey sees heavy rainfall through much of the year, and a flat roof with proper slope, drainage, and seam quality is built to handle that. We choose and install systems with our climate specifically in mind, not a generic specification applied the same way everywhere.
Flat roofing serves a wide range of properties.
On the commercial and industrial side, we install and repair flat roofing on warehouses, retail buildings, offices, and strata and multi-family properties, where a properly maintained system protects the building and reduces long-term costs. We can also pair it with metal wall cladding for a complete building envelope.
On the residential side, flat roofing shows up on additions, garages, modern flat-roof home designs, and covered walkways.
Same systems, same attention to slope and drainage, whichever type of property it is on.
We inspect the roof, check slope and drainage, and discuss which system fits your building.
We remove old roofing material and verify the deck is sound before installing anything new.
Where ponding is a risk, we address drainage with tapered insulation before the membrane goes on.
The system is installed to manufacturer specification, with proper seam welding, adhesion, or torch-application depending on the system.
Edges, penetrations, drains, and parapet walls are finished to keep water out at every transition point.
We review the completed roof with you before the job is considered done.
Flat roofing cost depends on the system, the size of the roof, and whether drainage correction is needed. As a general guide, torch-on (SBS modified bitumen) typically runs about $8 to $14 per square foot installed, TPO about $8 to $12, and EPDM about $7 to $11, with all three commonly lasting 20 to 30 years when properly installed and drained. Tapered insulation to correct ponding adds roughly $1.50 to $3 per square foot where it’s needed. We give a firm written price after a free on-site inspection, since the roof and its drainage decide the number.
Active Roofing installs and repairs flat roofing across Surrey, the Lower Mainland, and all over BC, for homes, businesses, and multi-family properties. For a free, no-obligation estimate, call or text us at (604) 765-0903.
