TPO Roof Cost Calculator

What this calculator estimates

This calculator gives you a line-by-line 2026 Canadian installed price for a TPO single-ply membrane roof. Whether you are re-roofing a 1,500 sq ft residential flat porch in Toronto, replacing a 12,000 sq ft strip-mall roof in Calgary, or specifying a 60,000 sq ft warehouse in Mississauga, the calculator follows the line-item structure CRCA-member roofers use on real bids:

• TPO membrane — 45-mil, 60-mil or 80-mil, mechanically attached, fully adhered, induction-welded RhinoBond or ballasted
• Tear-off — removing the existing membrane, insulation and fasteners
• Polyiso (ISO) insulation — R-20, R-30 or tapered ISO for slope, sized to NBC 9.36 climate zone
• HD coverboard — DensDeck Prime, SECUROCK or HD polyiso
• Drain count — internal drains and overflow scuppers per provincial plumbing code
• Permit, disposal, weekend premium and extra labour

A CAD 1,500 minimum mobilisation fee applies in most Canadian markets even on small jobs, because TPO requires a 2-person crew with a hot-air welder, induction welder (for RhinoBond) and crane.

How to use it

1. Enter roof area in square feet (use the building footprint if the roof is fully flat).
2. Pick membrane thickness — 45-mil for light residential, 60-mil for commercial standard, 80-mil for premium warranty.
3. Pick attachment method — mechanically attached (baseline), fully adhered (+18%), induction-welded RhinoBond (+10%) or ballasted (−15%).
4. Pick polyiso insulation — none (recover), R-20, R-30 or tapered (sized to your NBC 9.36 climate zone).
5. Set scope — spot repair (20%), partial replace (50%) or full re-roof (100%).
6. Set storey count — single-storey 1.0x, two-storey 1.18x, three-storey or higher 1.40x.
7. Set access difficulty — easy (drive-up) 1.0x, moderate (interior crane) 1.10x, hard (high-rise hoist) 1.30x.
8. Enter drain count and toggle tear-off, coverboard, permit, disposal, weekend premium and any extra labour hours.

Typical 2026 Canadian TPO roof cost ranges

These ranges reflect 2026 nationwide pricing from the CRCA Member Survey and Q1 2026 quotes from Toronto, Vancouver, Calgary, Edmonton, Montreal and Halifax.

Add 18 percent for two-storey, 40 percent for three-storey or higher. Add 10 to 30 percent for moderate to hard access. Add 25 percent for weekend or after-hours work.

Cost drivers

Membrane thickness and warranty tier. GAF EverGuard 60-mil is the workhorse for mid-market commercial. Holcim Elevate UltraPly 80-mil, Carlisle Sure-Weld 80-mil and JM JM TPO 80-mil are specified for warehouses with maintenance traffic, hospitals and where a 30-year non-pro-rated warranty is required for CMHC-insured financing. The 80-mil cap layer is roughly 50 percent thicker than 60-mil and carries a 30 to 50 percent material premium.

Attachment method. Mechanically attached is the fastest install (3,500 to 5,500 sq ft per day for a 2-person crew) and cheapest. Fully adhered is monolithic, has the best aesthetic and highest wind uplift, but costs 15 to 20 percent more. RhinoBond eliminates the linear seam weakness while keeping mechanical-attachment speed. Ballasted is generally limited to Atlantic provinces and the Pacific lower mainland where freeze-thaw cycle count is moderate.

Insulation and coverboard. Polyiso is the dominant substrate. Two layers staggered prevent thermal bridging through joints. Coverboard (DensDeck Prime, SECUROCK Gypsum-Fiber, HD polyiso) protects the TPO from polyiso facer punctures and is required by GAF, Carlisle, Holcim and JM for 20+ year warranties. NBC 9.36 climate zones 7A, 7B and 8 require R-50 to R-60 — typically 9 inches to 10.5 inches of polyiso, which significantly drives cost.

Tear-off versus recover. NBC permits up to two layers of roof covering before tear-off is required. Recovering an existing TPO or EPDM with new TPO is 25 to 35 percent cheaper than tear-off and reduces landfill volume. Tear-off is mandatory if the existing assembly is wet, water-damaged, or if a structural engineer requires deck inspection per CSA O86.

Drains and penetrations. Internal cast-iron drains (Watts, Zurn, Wade, Jay R. Smith) are CAD 360 to CAD 540 each installed retrofit. Overflow scuppers, pipe boots and HVAC curb flashings add CAD 220 to CAD 500 each. Reusing existing penetrations is cheaper than relocating but limits insulation slope design.

Storey, access and crane logistics. A single-storey commercial roof with truck access is the cheapest install. Two-storey adds 18 percent for hoist time. Three-storey-or-higher adds 40 percent for tower crane or telehandler rental at CAD 1,800 to CAD 3,500 per day plus mobilisation. Crane operations are governed by provincial OHS regulations (Ontario Reg 213/91, BC OHS Regulation 4.18, Quebec CNESST RSST section 22).

TPO chemistry and what makes a good Canadian product

TPO is a blend of polypropylene and ethylene-propylene rubber, reinforced with polyester scrim. For Canadian climate (extreme freeze-thaw cycles, moderate UV, heavy snow load, prairie wind), quality varies between manufacturers based on:

• UV stabilisers: hindered amine light stabilisers (HALS) and UV absorbers extend cap-layer life.
• Scrim weight: 800 to 1,500 denier polyester reinforcement. Heavier scrims resist puncture from prairie hail and rooftop snow-removal equipment.
• Cold-temperature flexibility: TPO is rated to −40°C per ASTM D5147; below that, EPDM is the safer choice. Prairie cities (Winnipeg, Regina, Saskatoon, Edmonton) experience −40°C only a few days per winter, but with windchill the membrane surface can reach colder temperatures.
• Freeze-thaw cycle durability: confirmed per CSA A123.21 cyclic testing.

For a 20+ year Canadian service life, specify a CCMC-listed manufacturer (GAF, Carlisle, Holcim, JM, Versico, IB Roof) with a 20-year NDL warranty and stainless-steel fasteners (mandatory in Atlantic provinces for salt-aerosol resistance).

Canadian code references and authority sources

• NBC 2020 Section 9.26 — roof systems for housing and small buildings
• NBC 2020 Section 9.36 — energy efficiency
• NBC 2020 Part 4 — structural design (commercial)
• CSA A123.21 — Standard test method for the dynamic wind uplift resistance of mechanically attached roof systems
• CSA A123.22 — Standard for SBS-modified bitumen sheet (used for reference durability)
• CAN/ULC S107 — Standard methods of fire tests of roof coverings
• CSA O86 — Engineering design in wood (roof deck capacity)
• CRCA Roofing Specifications Manual — the Canadian industry installation reference
• CCMC Evaluation Reports — third-party-verified system performance
• Energy Star Canada — Roof Products — cool-roof certification
• CMHC Builder’s Guide — flat-roof design for housing
• Provincial OHS regulations — fall-protection rules for roof work

When TPO is the wrong choice for a Canadian flat roof

• Far-north climates with extreme cold — EPDM rated to −51°C is the safer specification.
• Pitches above 1:12 — water-shedding metal, asphalt shingle or modified bitumen with mineral cap may outperform.
• Heritage Toronto or Heritage Montréal listed buildings — bright white TPO may be refused. Use a darker grey membrane or, better, traditional copper or zinc.
• Roofs with chemical exposure (kitchen exhaust, petrochemical) — PVC or KEE has better grease and chemical resistance.

Bidding strategy and red flags

Always get three written bids that itemise membrane brand, thickness, CCMC reference, warranty tier, attachment method, insulation R-value, coverboard and drain count. Confirm:

1. The bidder is on the manufacturer’s certified-applicator list (required for the 20+ year NDL warranty).
2. The bid includes wind-uplift testing per CSA A123.21 for your project’s exposure category.
3. The bid lists permit cost, disposal fees and crane mobilisation as separate line items.
4. The bid includes a 2-year workmanship warranty on top of the manufacturer’s material warranty.
5. The bid identifies the foreman and crew certification (provincial roofer certificate of qualification where applicable — Ontario 449A, Alberta journeyman roofer, BC TQ trades qualification).

For deeper estimating, also use our flat roof replacement cost calculator, built-up roof cost calculator and roof coating cost calculator to compare TPO against EPDM, mod-bit and built-up alternatives at your specific square footage and climate zone.