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Concrete Wall Access & Pour Platforms

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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Give the pour crew a safe place to stand: guarded, stable, tied in and inspected.

I am a:

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

What it isThe platforms, scaffolds, ladders and fall protection that give a pour crew a safe place to stand.
Your jobBuild the access with the same care as the forms: stable, guarded, tied in and inspected.
The hard ruleNever work from a wall top or a custom platform without guardrails or fall protection. Keep booms clear of power lines.
The checkGuardrails, ladders, planks, tie-ins, anchors and the rescue plan.

By the end you can

  • Set a ladder at the right angle and height.
  • Name the access options: wall-top walkways, scaffold, pump jacks, pour bridges.
  • Say when fall protection is required and what a guardrail is.
  • Spot the hazards of pump hoses and booms.
Stop and read

Falls from wall tops and platforms are one of the biggest hazards on a foundation job. Use guardrails first. Where a guardrail is not possible, use a harness, lanyard and a rated anchor, with training and a rescue plan.

Pump hoses whip and booms can strike a worker or touch power lines. Keep people clear, keep booms well away from overhead lines (check the required clearance) and have a trained person handle the hose.

Do not rely on US figures from OSHA guides. The regulator's numbers for your province are the ones that count.

The big idea

Wall access systems give the pour crew a stable place to stand to place concrete, vibrate, set anchors and guide a pump hose. NBC Part 9 does not set jobsite fall rules, so your provincial OHS regulation decides.

A side view of a platform edge with a ladder leaning on it. The ladder base is one unit out for every four units up, about seventy-five degrees, extends about one metre above the landing and is tied off. A guardrail on the elevated platform has its top rail at about one metre.
Ladder angle, extension and guardrail height. About 1 out for every 4 up (1 m, 3 ft 3 in out for 4 m, 13 ft 1 in up), extended about 1 m (3 ft 3 in) above the landing and tied off. Guardrail top rail height and ladder extension differ by province (for example BC gives a top rail of 102 to 112 cm, 40 to 44 in, and Ontario 900 mm, 2 ft 11 in, above the landing). Not to scale. Confirm the exact figures in your OHS regulation.

What the regulations say

  • Fall protection (BC): required where a fall of 3 m (10 ft) or more may occur, and where a fall under 3 m carries a greater risk of injury than an impact on a flat surface (OHS Regulation s. 11.2(1), as set out in WorkSafeBC's Part 11 guidelines). Check your province for its own trigger.
  • Guardrails (BC): top rail 102 to 112 cm (40 to 44 in) above the work surface, a midrail roughly halfway between the top rail and the toeboard or work surface, and temporary guardrails able to withstand 550 N (125 lb) applied perpendicular to the span.
  • Extension ladders (an undated summary of provincial rules): BC about 75° and about 1 m above the upper landing; Alberta base no more than 1/4 of the height out and at least 1 m above; Manitoba, Saskatchewan and the territories no steeper than 1:4 and at least 1 m above; Ontario base 1/4 to 1/3 out and at least 900 mm above; Quebec 900 mm above. All say to secure the ladder. Check the current text for your province.

The ladder summary is a secondary source with no date, so treat it as a guide to what to look up, not a rule.

Access systems

  • Wall-top walkways: scaffold-grade planks of the size the rules require, supported, secured and with guardrails on elevated walkways. A safe way up and down is needed.
  • Frame scaffold: commercial frames with base plates, braces and platforms on a levelled base, tied where required and set up to the maker's instructions, by a scaffold company or trained crew. Custom-built platforms only to a design and with competent supervision.
  • Pump-jack systems: poles, jacks and platforms that adjust height. Follow the maker's limits and your OHS rules.
  • Pour bridges: temporary platforms that give hose control over the forms, with guardrails and tie-ins.
  • Ladders: stepladders and extension ladders rated for the load. A foundation access ladder gives a safe way in and out of an excavation, within reach of every worker (see Trench Safety).

Setting a ladder

Example (numbers made up). A platform 3 m (9 ft 10 in) up with a ladder at 1 out for every 4 up puts the base 3 ÷ 4 = 0.75 m (2 ft 6 in) out. The ladder runs about 3.1 m to the platform edge, plus about 1 m above it, so you need roughly 4.1 m (13 ft 5 in) of ladder at minimum. Tie it off at the top, and check your province's extension height.

Common mistakes

  • Walking on unsupported or damaged planks
  • No guardrails
  • Ladders at the wrong angle
  • Not tying off ladders
  • No fall arrest anchor
  • Overloading a platform
  • Working in strong wind
Pro note

Falls are the number one hazard during a wall pour. Build access with the same care as the forms. A safe pour is a good pour.

Weather note

Rain and frost make planks and ladders slick, wind makes a pump hose hard to control and ladders dangerous, and heat tires the crew. Clear ice and snow and do not pour from makeshift footing.

What the inspector or safety officer looks at

Guardrails, ladders, platform strength, fall protection and a rescue plan, where the work needs them. Confirm what your authority checks.

✅ Check yourselfTap a question
In BC, when is fall protection required?
Where a fall of 3 m (10 ft) or more may occur, and also where a fall of less than 3 m carries a greater risk of injury than an impact on a flat surface (OHS Regulation s. 11.2(1), per WorkSafeBC guidelines). Check your own province.
What top rail height does WorkSafeBC give for a guardrail?
102 to 112 cm (40 to 44 in) above the work surface, with a midrail roughly halfway between the top rail and the toeboard or work surface. Temporary guardrails must withstand 550 N (125 lb) applied perpendicular to the span.
Ladder rules in BC, per an undated summary article?
About 75° from horizontal, projecting about 1 m above the upper landing, and secured if used for access or if conditions could make it unstable. Other provinces differ (Ontario 900 mm above the landing, Alberta at least 1 m, and so on).
A platform is 3 m (9 ft 10 in) up. How far out does the ladder base go at 1 out for every 4 up?
3 ÷ 4 = 0.75 m (2 ft 6 in). The ladder is then about 3.1 m to the platform edge, plus about 1 m above, so roughly 4.1 m (13 ft 5 in) minimum. Numbers are made up.
Why must pump booms keep well away from overhead lines?
Touching a power line can electrocute people through the boom, the hose or the truck. Check the required clearance with your provincial regulator and the utility.
A plank is cracked. What do you do?
Take it out of service. Do not walk on an unsupported or damaged plank.
🧰 Gear for this stepMust-haveRent itNice to have
  • Rent itScaffolds: frame scaffold with base plates, braces and platforms erected and inspected by a scaffold company or trained crew
  • Must-haveWalkways and rails:
  • Must-haveLadders:
  • Must-haveFall protection: harness, lanyard and a rated anchor point (CSA Z259) where guardrails are not possible; inspection tags
  • Rent itPump-jack systems:
  • Must-havePPE: hard hat (CSA Z94.1) with a chin strap where working at height, safety glasses (CSA Z94.3), non-slip green-triangle safety boots (CSA Z195), gloves, hi-vis clothing
🛒 Buy, rent or borrow?Tap your level
Home DIY
Hire a scaffold company to erect and inspect any scaffold or pour platform. Buy your own boots, hard hat and gloves. Do not work from wall tops or custom platforms, and do not work where a fall of 3 m (10 ft) or more could happen without proper guardrails or fall protection. Do not run a pump boom near power lines; hire a trained crew.
Laborer or helper
Work only from guardrailed platforms or ladders set up for you. Do not climb wall tops or work at height without fall protection. Do not touch a pump boom near power lines. Stop and tell your lead if a platform feels loose.
1st-year apprentice
Work from guardrailed platforms and tied-off ladders only. Learn ladder setup, scaffold inspection and fall protection training before you work at height.
Apprentice, 2nd to 4th year
Set up ladders and platforms to the plan and inspect them before each shift. Use fall protection where guardrails are not possible, with an anchor rated for it, and report any damaged plank, rail or ladder.
Journeyperson
You own access, guardrails, ladders and fall protection for the pour, and the call to stop the pour if it is not safe. Check the rescue plan and make sure workers are trained.
Lead hand or foreman
Check platforms, ladders, guardrails, tie-ins, fall protection anchors and the rescue plan before the pour, and keep power line clearance on the pump plan.
Contractor or business owner
Price a scaffold company, guardrails, fall protection gear and training, and a rescue plan as separate lines. Keep training and inspection records, and ask your insurer who carries the risk of a fall.
Starting a new business
Learn your province's fall protection, ladder and scaffold rules and training requirements before you quote. Confirm insurance and workers' compensation coverage before your first pour job.
By Province:

Fall protection triggers, guardrail heights and ladder rules are set by each province's OHS regulation and differ in the details. The extension ladder differences are listed above. I dropped the old per-province guardrail heights because I could not verify them. Confirm the numbers with your regulator.

See Canada by Province for the full comparison.

Sources:

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

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