Garage & Parking Structure Inspection

Per CSA A23.1 and CSA A23.3, parking structure concrete must be designed for the severe exposure environment including de-icing salts, freeze-thaw cycles, and vehicular loads. Concrete must meet a minimum exposure class of C-1 (or C-XL for critical elements) with specified maximum water-to-cement ratio and minimum air content. Reinforcement must have adequate concrete cover (minimum 40 mm for exposed slabs per CSA A23.1) and may require epoxy coating or corrosion-resistant alternatives in high-exposure zones.

1. Verify concrete mix design meets the specified exposure class (minimum C-1, typically C-XL for exposed decks) per CSA A23.1 Table 1

2. Confirm reinforcement cover meets the minimum specified (40 mm for exposed slabs, 60 mm for foundations) using a cover metre

3. Check that epoxy-coated or corrosion-resistant reinforcement is used where specified for elevated slabs and exposed elements

4. Verify concrete test cylinder results meet the specified compressive strength at 28 days per CSA A23.1 Table 7

5. Confirm air content in the fresh concrete meets CSA A23.1 Table 2 requirements for the exposure class (typically 5-8%)

- Concrete cover less than the specified minimum exposing reinforcement to de-icing salt corrosion

- Air content outside the required range for freeze-thaw durability

- Epoxy coating on reinforcement damaged during handling and not repaired

- Concrete mix not meeting the specified exposure class requirements

Per NBC and CSA A23.1, parking structure floor slabs must be sloped to drain water and de-icing salt solutions to floor drains or the perimeter. A minimum slope of 1.5% (1 in 65) is typically required for effective drainage. Floor drains must be connected to an oil-water separator before discharging to the sanitary or storm sewer per municipal bylaws. Ponding of salt-laden water accelerates concrete deterioration and reinforcement corrosion.

1. Verify the floor slab is sloped at minimum 1.5% toward floor drains or the building perimeter with no areas of ponding

2. Confirm floor drains are installed at low points and are functional with no blockages

3. Check that the drainage system includes an oil-water separator per municipal sewer use bylaw requirements

4. Verify the drainage system capacity is adequate for the expected volume of water and snowmelt from vehicles

5. Confirm perimeter drainage at the building exterior directs water away from the foundation per NBC

- Insufficient floor slope causing ponding of salt-laden water and accelerated concrete deterioration

- Floor drains clogged with debris or sediment reducing drainage capacity

- Oil-water separator not installed or not maintained per municipal requirements

- Low spots in the slab creating permanent puddles that damage the concrete surface

Per CSA A23.1 and parking structure best practices, elevated parking decks and occupied spaces below grade must be waterproofed with a traffic-bearing membrane. Penetrating sealers or surface coatings may be applied to exposed concrete surfaces to reduce chloride ingress. Waterproofing membranes must be compatible with the concrete substrate, capable of bridging cracks, and resistant to de-icing chemicals and fuel spills. Membrane installation must comply with manufacturer's specifications.

1. Verify the waterproofing membrane type matches the specification and is applied at the required thickness per manufacturer's instructions

2. Confirm membrane adhesion to the concrete substrate by performing pull-off tests at the required frequency

3. Check that the membrane is continuous with properly detailed laps, terminations, and transitions at drains, columns, and walls

4. Verify penetrating sealers are applied to clean, dry concrete at the specified coverage rate

5. Confirm the membrane is protected from construction traffic damage until it has fully cured

- Membrane applied to damp or contaminated concrete resulting in adhesion failure

- Membrane thickness below specification reducing waterproofing performance and crack-bridging ability

- Laps and terminations not properly sealed creating water ingress paths

- Membrane damaged by construction traffic before adequate curing

Per NBC Part 6 and ASHRAE 62.1, enclosed parking garages must be mechanically ventilated to maintain carbon monoxide (CO) levels below 25 ppm (8-hour average) per provincial OH&S regulations. Ventilation systems must provide a minimum of 7.5 L/s per square metre of floor area or be controlled by CO monitoring sensors. CO sensors must be installed per ASHRAE 62.1 at breathing zone height (typically 900-1500 mm above floor) and connected to the ventilation system for automatic activation.

1. Verify mechanical ventilation capacity meets the minimum airflow rate per NBC Part 6 (typically 7.5 L/s per m2) or is demand-controlled with CO sensors

2. Confirm CO monitoring sensors are installed at the required spacing and height (typically 900-1500 mm above floor per ASHRAE 62.1)

3. Check that the CO monitoring system activates the exhaust fans at the specified CO concentration threshold (typically 25 ppm)

4. Verify exhaust air discharge points are located per NBC to avoid re-entrainment into the building or adjacent fresh air intakes

5. Confirm the ventilation system is balanced with adequate make-up air to prevent negative pressurisation of the garage

- CO sensors installed at incorrect height or spacing providing unrepresentative readings

- Ventilation fan capacity insufficient for the garage floor area resulting in elevated CO levels

- Exhaust air discharge too close to building fresh air intakes or openable windows

- Make-up air not provided causing excessive negative pressure and door operation problems

Per NBC Part 3, parking garages must be separated from the remainder of the building by fire separations with the required fire resistance rating (typically 1.5 hours for underground garages, 1 hour for above grade). Openings in fire separations must be protected with fire-rated closures. Sprinkler systems must be provided per NBC and NFPA 13 for enclosed parking structures. Fire department access routes and standpipe connections must be maintained per the National Fire Code of Canada (NFC).

1. Verify fire separations between the parking garage and other occupancies achieve the required fire resistance rating per NBC Part 3

2. Confirm all openings in fire separations are protected with fire-rated closures (doors, dampers, firestopping) per NBC

3. Check that the sprinkler system is installed per NFPA 13 with adequate head spacing, coverage, and clearance from obstructions

4. Verify fire department access routes within the garage are clear with adequate height clearance and turning radii

5. Confirm standpipe connections and fire department Siamese connections are installed, accessible, and properly identified per NFC

- Fire separation compromised by unsealed penetrations from services or conduit

- Fire-rated doors propped open or with non-functioning self-closing hardware

- Sprinkler heads obstructed by piping, ducts, or other overhead services reducing coverage

- Fire department access routes blocked by parked vehicles or construction materials

Per CSA B149.1 and CSA C22.1, gas piping and electrical installations in parking garages must comply with specific safety requirements. Gas appliances in residential garages must have ignition sources elevated minimum 450 mm above the floor per CSA B149.1. Electrical receptacles and switches in commercial garages must comply with CEC Section 20 (hazardous locations) where flammable vapours may be present. EV charging stations must be installed per CEC Section 86 with dedicated circuits and appropriate overcurrent protection.

1. Verify gas appliance ignition sources (water heaters, furnaces) are elevated minimum 450 mm above the garage floor per CSA B149.1

2. Confirm electrical outlets and switches comply with CEC Section 20 requirements for the garage classification

3. Check that EV charging stations are installed per CEC Section 86 with dedicated circuits, GFCI protection, and proper signage

4. Verify lighting in the garage meets the minimum illumination levels per NBC (typically 50 lux for parking areas, 200 lux for entrances)

5. Confirm emergency lighting and exit signage are installed per NBC Part 3 and connected to the emergency power supply

- Gas water heater in a residential garage with the pilot light below the 450 mm elevation requirement

- Electrical installations in commercial garages not classified per CEC Section 20

- EV charging stations without dedicated circuits causing overcurrent conditions

- Emergency lighting and exit signs not functional or not connected to backup power

Per municipal bylaws and NBC, parking structures must include clear traffic markings for driving lanes, parking spaces, pedestrian routes, and directional signage. Parking space dimensions must comply with municipal zoning bylaws (typically 2.6 m wide by 5.5 m long minimum). Vehicle barriers and guard rails must be designed per NBC Part 4 to resist the specified vehicle impact loads. Pedestrian safety features including walkways, speed bumps, and convex mirrors must be provided where required.

1. Verify parking space dimensions comply with municipal zoning requirements (typically minimum 2.6 m wide by 5.5 m long)

2. Confirm driving lane widths meet the minimum for the configuration (typically 6.0 m for two-way, 3.6 m for one-way traffic)

3. Check that vehicle barriers and guard rails at floor edges and ramps are designed for the required impact loads per NBC Part 4

4. Verify pedestrian walkways are delineated with painted markings, bollards, or physical separation from vehicular traffic

5. Confirm directional signage, speed limit signs, and height clearance signs are installed at all decision points and transitions

- Parking space markings not visible due to wear or poor paint application

- Vehicle barriers not designed for the required impact load per NBC Part 4

- Pedestrian routes not clearly marked or separated from vehicular traffic

- Height clearance signs missing at ramp transitions and entrances