Torch-on modified bitumen (mod-bit) is one of the three primary flat roofing systems used in Surrey, BC. Applied by heat-fusing layers of modified asphalt membrane to the substrate with a propane torch, it creates a robust, self-adhering system that has been the standard for residential flat roofing and small commercial applications in BC for decades.
Free torch-on roofing estimate: I-M Roofing Ltd. — 236-838-9577
Torch-On Roofing Cost Surrey BC — 2026
| Scope | Cost Per Sq Ft | 600 sq ft | 2,000 sq ft |
|---|---|---|---|
| Torch-on single ply (base + cap) | $4.00 – $7.00 | $2,400 – $4,200 | $8,000 – $14,000 |
| Torch-on two-ply system (commercial) | $5.50 – $9.00 | $3,300 – $5,400 | $11,000 – $18,000 |
| Torch-on patch repair | $400 – $900 per area | — | — |
Torch-On Roofing in Surrey’s Climate
Torch-on has been used extensively in Surrey residential and commercial flat roofing for 30+ years. Key Surrey-specific considerations:
- Excellent adhesion to substrate — no risk of wind uplift in the membrane field (a concern with mechanically fastened TPO on high-wind Surrey properties)
- Black surface absorbs heat — less energy efficient than white TPO in summer, but less of a concern for residential applications where the space below is insulated
- Fire risk during installation — torch application requires care near combustibles; experienced crews manage this as standard practice, but it’s a consideration for wood-framed residential installations
- Good performance on complex geometries — torch-on conforms well around drains, curbs, and irregular shapes that are common in older Surrey residential flat roofs
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Free torch-on estimate: 236-838-9577
