Garage & Parking Structure Inspection

Per ASCE 7 Table 4.3-1, parking garages must be designed for a minimum uniform live load of 40 psf for passenger vehicles. Per IBC 406.2.2, vehicle barriers must resist a horizontal load of 6,000 pounds applied at 18 inches above the floor or ramp surface. Structural members must be designed per ACI 318 with adequate reinforcement for flexure, shear, and torsion. Per ACI 362.1R, special attention must be given to connection details between precast members and to expansion joint placement at intervals not exceeding 300 feet.

1. Review structural drawings and verify live load design meets ASCE 7 requirements (40 psf minimum)

2. Confirm vehicle barrier design resists 6,000-pound horizontal load at 18 inches above floor

3. Inspect structural connections — precast bearing pads, weld plates, and grouted connections

4. Verify expansion joints are provided at proper intervals and allow free movement

5. Check column and beam dimensions against approved structural drawings

- Vehicle barriers not designed for required 6,000-pound horizontal impact load

- Expansion joints missing or spaced beyond 300-foot maximum intervals causing cracking

- Precast connection hardware improperly installed or missing corrosion protection

- Column sizes or reinforcement not matching approved structural drawings

Per ACI 362.1R and ACI 318 Section 19.3.1, parking structure slabs exposed to deicing chemicals must use concrete with a maximum water-cement ratio of 0.40, minimum compressive strength of 4,500 psi, and minimum air entrainment of 5-7% for freeze-thaw durability. Minimum concrete cover over reinforcement must be 1-1/2 inches for surfaces exposed to weather per ACI 318 Table 20.6.1.3.1. Slabs must have a minimum slope of 1.5% for drainage per ACI 362.1R. Construction joints must be located at points of minimum shear stress.

1. Review concrete mix design for w/c ratio (0.40 max), strength (4,500 psi min), and air content (5-7%)

2. Verify reinforcement cover with a cover meter — 1-1/2 inches minimum for exposed surfaces

3. Measure floor slope at multiple points to confirm minimum 1.5% drainage slope

4. Inspect slab surface for scaling, spalling, delamination, or map cracking

5. Perform chain drag or hammer sounding to detect subsurface delamination

- Concrete cover below minimum 1-1/2 inches allowing chloride penetration to reinforcement

- Insufficient floor slope creating standing water and accelerating deterioration

- Surface scaling from inadequate air entrainment in freeze-thaw environments

- Construction joints poorly located or without dowels creating differential movement

Per ACI 362.1R Chapter 7, parking structure waterproofing must include either integral concrete sealers, membrane systems, or a combination approach. Traffic-bearing membrane systems on elevated decks must comply with ASTM C957 and withstand vehicular traffic loads. Floor drains must be provided per IPC Section 412 to prevent water accumulation. Drain spacing should ensure no ponding occurs. Below-grade parking structures require waterproofing per IBC 1805 with positive-side or blind-side membrane systems rated for hydrostatic conditions.

1. Inspect membrane application for uniform coverage, proper thickness, and adhesion to substrate

2. Verify floor drains are properly located, functional, and connected to storm water management system

3. Check for standing water or ponding — all areas should drain within 15 minutes after rainfall

4. Inspect expansion joint sealants and waterproofing transitions at columns and walls

5. Verify below-grade waterproofing system is continuous and properly detailed at penetrations

- Traffic membrane debonding from concrete substrate due to poor surface preparation

- Floor drains clogged or insufficient in number creating ponding areas

- Expansion joint seals deteriorated allowing water to leak to levels below

- Below-grade waterproofing breached at utility penetrations or construction joints

Per IMC Section 404, enclosed parking garages must provide mechanical ventilation capable of exhausting a minimum of 0.75 CFM per square foot of floor area, or an approved engineered system with CO and NO2 monitoring. Per IBC 406.6.3, CO detection systems must activate ventilation when CO levels reach 35 ppm and trigger alarms at 200 ppm. Open parking garages (per IBC 406.5) with natural ventilation openings of at least 20% of the perimeter wall area on each tier may be exempt from mechanical ventilation but must still comply with CO monitoring requirements.

1. Verify mechanical ventilation capacity meets 0.75 CFM/sq ft or engineered alternative is approved

2. Test CO detection system — verify activation of ventilation at 35 ppm and alarm at 200 ppm

3. Check CO sensor locations — typically mounted 3-5 feet above floor at intervals per design

4. Confirm exhaust fan operation and verify air movement direction away from occupied areas

5. Inspect open garage ventilation openings — minimum 20% of perimeter wall area for open classification

- Mechanical ventilation capacity below 0.75 CFM/sq ft in enclosed garages

- CO sensors improperly calibrated or positioned too high to detect vehicle-level emissions

- Ventilation system not interlocked with CO detection for automatic activation

- Open parking garage classification claimed despite insufficient perimeter openings

Per NFPA 88A and IBC 406, enclosed parking garages must be equipped with automatic sprinkler systems per NFPA 13. Sprinkler design density for ordinary hazard Group 1 occupancy is typically 0.15 GPM per square foot over a 1,500 sq ft design area. Per IBC 406.6.1, enclosed garages must have fire-resistance-rated construction per IBC Table 601. Standpipe systems are required in garages where the floor level is more than 30 feet above or below fire department vehicle access per IBC 905. Fire department connections must be readily accessible per NFPA 14.

1. Verify automatic sprinkler system installation meets NFPA 13 design density for occupancy classification

2. Check sprinkler head spacing, clearance from obstructions, and coverage per NFPA 13 requirements

3. Confirm fire-resistance ratings of structural elements match IBC Table 601 for construction type

4. Verify standpipe system is installed and functional where floors exceed 30-foot threshold

5. Inspect fire department connections for accessibility, proper marking, and correct thread type

- Sprinkler heads obstructed by structural members, pipes, or conduit reducing coverage

- Fire-resistance coating or fireproofing damaged or missing on structural steel members

- Standpipe hose connections inaccessible due to parked vehicles or storage

- Missing or improperly rated fire separation between garage and adjacent occupancies

Per IES RP-20 (Lighting for Parking Facilities), minimum maintained illumination for parking garages is 5 foot-candles for general parking areas, 10 foot-candles for ramps and corners, and 50 foot-candles at entrance/exit transitions. Emergency lighting per IBC 1008.3 must provide a minimum of 1 foot-candle at floor level for 90 minutes upon power failure. Per IBC 406 and local traffic codes, directional signage, speed limit postings, and pedestrian warning signs must be clearly visible. Minimum ceiling height is 7 feet for passenger vehicle areas per IBC 406.2.1.

1. Measure illumination levels with a light meter — 5 fc general, 10 fc ramps/corners, 50 fc transitions

2. Test emergency lighting by simulating power failure — verify 1 fc minimum for 90 minutes

3. Inspect directional signage for visibility, proper placement, and reflective or illuminated surfaces

4. Verify minimum ceiling clearance of 7 feet in all vehicle travel areas

5. Check pedestrian walkway markings and warning signage at vehicle-pedestrian conflict points

- Illumination below minimum foot-candle requirements especially in corners and stairwells

- Emergency lighting fixtures not maintained or batteries failed during testing

- Directional signage obscured by structural elements or poorly positioned

- Pedestrian pathways unmarked or lacking protective barriers at vehicle crossing points