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Driveway & Sidewalk Placement

Written for Canada. Plans are metric, but many crews and suppliers work in feet and inches, so this site gives both: millimetres and metres, with feet and inches beside them. Codes are the National Building Code of Canada 2020 (NBC 2020) Part 9 as your province adopts it. A number marked Confirm has not been checked against every province, so check it with your own authority before you act on it.

Reviewed by a working tradesman with 17+ years in the field.

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Exterior flatwork takes frost, salt, water and vehicles. It lives or dies on air entrainment, drainage, joints and curing.

I am a:

Tap your level and the boxes below open to the advice for you. Remembered on this device.

What it isPlacing, finishing, jointing and curing exterior driveways and sidewalks.
Your jobGet the air-entrained mix, the slope, the joints and the curing right.
The hard ruleNever steel trowel air-entrained concrete, and never add water at the truck.
The checkWater drains away, joints are cut in time, cured at least 7 days, no salt the first winter.

By the end you can

  • Order the right mix for exterior flatwork.
  • Set the slope and joint layout before the pour.
  • Finish an air-entrained slab without a steel trowel.
  • Cure and protect new flatwork, including from salt.
Stop and read

Work next to a road or a public sidewalk puts you near traffic. Keep the public out of the work with barriers, and work in the road allowance only under the municipal permit. Wet concrete burns skin, so wear gloves, long sleeves, tall waterproof boots and eye protection, and use kneeboards. Keep clear of trucks, pump booms and hoses.

The big idea

Exterior flatwork takes frost, salt, water and vehicles. It lives or dies on air entrainment, drainage, joints and curing.

The mix

The Canadian residential flatwork guide from the cement industry (Concrete Ontario) gives exposure class C-2 under CSA A23.1 for exterior flatwork exposed to chlorides and freeze-thaw: 32 MPa, a maximum water-to-cementing ratio of 0.45, and 5 to 8 percent air with 20 mm aggregate. NBC Part 9 gives 32 MPa with 5 to 8 percent air for garage floors and exterior steps (9.3.1.6). A provincial standard drawing I read for combined curb, sidewalk and driveway also asks for 32 MPa, class C-2. Confirm slump with your supplier. Do not add water on site, since it can push the mix past its water ratio.

Before you pour

Run the checklist on the Concrete Delivery & Preparation page, plus these flatwork checks.

  • Base properly graded and compacted for even support. In hot weather, dampen it before the pour, with no puddles.
  • Thickness and base depth come from your municipality or the drawings. Two public examples: Toronto's standard drawing for sidewalks and driveways shows a 130 mm (5 1/8 in) sidewalk, a 180 mm (7 1/8 in) driveway for industrial and high-density residential, and a 150 mm (6 in) granular A base. A Newfoundland and Labrador standard drawing gives a 150 mm (6 in) minimum for the driveway portion. A private residential driveway may differ. Confirm with your municipality.
  • Slope so water runs away from the building and off the surface. Toronto's drawing shows 2% typical and 4% maximum cross slope on sidewalks. A 2% slope across a 1.2 m (3 ft 11 in) sidewalk is 1,200 × 0.02 = 24 mm (about 15/16 in) of fall.
  • Steel or mesh on chairs, if specified.
  • Joint layout marked, with isolation joints wherever the concrete meets structures, curbs or fixed surfaces.
  • Forms straight and set to elevation.

Placing, consolidating and screeding

  • Start at the farthest point and work back.
  • Pull concrete with rakes. Do not drag the mesh.
  • Rod or vibrate along the edges, and do not over-vibrate.
  • Screed to the forms, filling low spots at once.

Example quantity. A driveway 3.6 m × 6 m (11 ft 10 in × 19 ft 8 in) at 150 mm (6 in) holds 3.6 × 6 × 0.15 = 3.24 m³ (4.2 yd³) before any allowance. The sizes are made up.

Floating, edging and finishing

  • Bull float right after screeding, then apply the final texture. Keep finishing to a minimum.
  • Use magnesium or aluminum floats held as flat as you can. The cement-industry guide says to avoid steel trowels, garden rakes and rolling bugs, and that air-entrained concrete should never be steel trowelled.
  • Do not add water to the surface as a finishing aid.
  • Edge before brooming so the edge does not tear.
  • Light misting, fog spraying or an approved evaporation reducer can slow surface drying on hot or windy days.
  • Apply a broom finish for traction. See Broom Finishing.

Joints

  • Control joints are at least one quarter of the slab thickness deep, hand-tooled in the fresh concrete or sawn. The Portland Cement Association guidance used on the Slab and Pad Forms page puts the maximum spacing at 24 to 36 times the thickness, with panels square or nearly so (length no more than 1.5 times width). The drawings and your municipality come first.
  • Isolation joints are full depth where the concrete meets other structures.

Example. A 150 mm (6 in) driveway: 24 × 150 = 3.6 m (11 ft 10 in) and 36 × 150 = 5.4 m (17 ft 9 in) as the maximum. A joint across a 6 m (19 ft 8 in) length at 3.0 m (9 ft 10 in) makes two panels of 3.6 m × 3.0 m, a ratio of 1.2. The spacing is 20 times the thickness, which is under the maximum.

Curing and protection

  • Cure at least 7 days, starting right after finishing, and keep the concrete above 10°C (50°F), says the cement-industry guide. Use curing compound, poly, wet burlap, or sprinklers once the concrete is hard enough.
  • No de-icing chemicals, especially in the first winter. Use sand or fine grit for traction instead.
  • Sealing. The guide recommends routine sealing, typically every 1 to 2 years, after proper curing.
  • Late-season pours. The guide says to avoid placing flatwork late in fall and early winter if possible, so the concrete can cure and air dry before freeze-thaw and salt.
  • Below 5°C (41°F), Part 9 requires the concrete to be kept at 10°C (50°F) or warmer for 72 hours after placing (9.3.1.9).
  • I did not find a Canadian source for when to walk or drive on new flatwork, so ask your supplier.

Common mistakes

  • Water pooling from the wrong slope
  • Mesh on the ground
  • Finishing too early
  • Steel troweling air-entrained concrete
  • Missing or late joints
  • Scaling from poor curing, no air, or early salt
Pro note

Set the slope with a string line before the truck arrives. Water that sits on a slab is what destroys it.

Weather note

Frost and salt are the biggest threats. Hot sun and wind can crack the surface before you finish. Rain on an unfinished slab roughs up the surface. In hot weather, schedule early and dampen the base.

What the inspector looks at

Base, thickness, slope, joints and steel before the pour. Municipal inspectors may also check the work against a standard detail for sidewalks and driveway aprons.

✅ Check yourselfTap a question
What mix does the Canadian residential flatwork guide give for exterior concrete exposed to freeze-thaw and de-icing salts?
Exposure class C-2: 32 MPa, maximum water-to-cementing ratio of 0.45, and 5 to 8 percent air with 20 mm aggregate.
A driveway is 3.6 m × 6 m × 150 mm (11 ft 10 in × 19 ft 8 in × 6 in). How much concrete is that?
3.6 × 6 × 0.15 = 3.24 m³ (4.2 yd³), before any allowance.
The same driveway has a joint across the length at 3 m (9 ft 10 in). What are the panel sizes, and is the ratio all right?
Two panels 3.6 m × 3.0 m (11 ft 10 in × 9 ft 10 in). The ratio is 3.6 ÷ 3.0 = 1.2, under 1.5. The spacing is 20 times the thickness, which is under the 24 times maximum.
A sidewalk is 1.2 m (3 ft 11 in) wide with a 2% cross slope. How much fall is that across the width?
1,200 × 0.02 = 24 mm (about 15/16 in). Toronto's standard drawing calls 2% typical and 4% maximum for sidewalks.
May you steel trowel an air-entrained driveway to get a smooth finish?
No. The guide says air-entrained concrete should never be steel trowelled. Use magnesium or aluminum floats, then broom.
How long should exterior flatwork be cured, and when should you avoid de-icing salt?
At least 7 days, starting right after finishing, keeping the concrete above 10°C. Avoid de-icing chemicals, especially in the first winter. Use sand or fine grit instead.
🧰 Gear for this stepMust-haveRent itNice to have
  • Must-haveLayout and checking:
  • Must-havePlacing by hand:
  • Rent itPlacing by machine: a chute or pump
  • Must-haveScreeding and floating:
  • Must-haveEdging and joints:
  • Must-haveFinishing and curing:
  • Must-haveConsumables:
  • Must-havePPE: green-triangle boots (CSA Z195), tall waterproof boots for wet work, eye protection (CSA Z94.3), waterproof alkali-resistant gloves, long sleeves, knee pads, a hard hat (CSA Z94.1) near pump booms and trucks, and a respirator (CSA Z94.4) only as a backup to wet cutting or dust extraction
👷 Who can do thisTap your level
Home DIY
A capable owner can pour a small walk or driveway pad with help, on a well-compacted base, at the thickness and slope the municipality asks for. Work in or next to the public road or sidewalk needs a municipal permit, and big pours are a job for a crew.
Laborer or helper
Help with base compaction, forming and cleanup under direction. Stay clear of traffic. Work in or next to the public road only under the municipal permit and your lead's direction. Report a soft base or rain coming.
1st-year apprentice
You can place, screed, float, edge and broom under supervision. Learn timing first. Too early traps water, too late will not close.
Apprentice, 2nd to 4th year
Place, screed, float, edge and broom under supervision. Learn timing. Check that the ticket shows an air-entrained mix, and tell your journeyperson if it does not. Never steel trowel air-entrained concrete.
Journeyperson
You own slope, joints, air-entrained mix, curing and the finish. Stop-work triggers: rain or frost forecast within the finishing window, a base that is not firm, or a mix without air entrainment. Set the control joint layout before the pour.
Lead hand or foreman
Check the forecast and the base before the truck is called. Enforce the stop-work triggers: rain or frost in the finishing window, a soft base, or no air entrainment. Lay out control joints with the crew before the pour and keep the public off the work.
Contractor or business owner
Price the base work, forms, finishing crew and cure. Check municipal permits for work at the road. Scaling from salt or poor curing comes back as a warranty claim, so document the mix, air and curing plan. Ask your lawyer or insurer about warranty terms.
Starting a new business
Learn the municipal permit steps for work at the road and the mix a driveway needs. Subcontract base work or finishing until your crew is proven. Confirm road permits with the municipality, and ask your insurer and lawyer about warranty and coverage for salt scaling.
By Province:

NBC Part 9 gives 32 MPa with 5 to 8 percent air for garage floors and exterior steps. Driveway and sidewalk thickness, base and slope are usually municipal standards. Provinces adopt the code with changes, so check your edition.

  • ON: the City of Toronto's standard drawing for sidewalks and driveways shows a 130 mm sidewalk, a 180 mm driveway for industrial and high-density residential, a 150 mm granular A base and 2% typical cross slope on sidewalks. It is a city example, not a province-wide rule.
  • NL: a provincial standard drawing for combined curb, sidewalk and driveway ramp gives a 150 mm minimum driveway thickness and 32 MPa, class C-2.
  • All provinces: confirm thickness, base, slope and permit rules with your municipality, especially for any work at the road.

See Canada by Province for the full comparison.

Sources:

Last reviewed October 2026. General information, not engineering or legal advice.

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