Feasible for experienced DIYers with a strong understanding of structural engineering principles, carpentry, and ADA compliance. Professional consultation or installation is recommended to ensure code adherence and safety, especially for public-facing or complex designs.
Ramp construction requires precise adherence to ADA slope and dimension requirements, structural integrity for anticipated loads, proper frost-protected foundations for DuPage County's 42-inch frost depth, and appropriate material selection for regional climate.
Project Guidelines & Rules
General Accessibility & Geometric Requirements
10 Rules
Maximum Ramp Slope
1:12 (8.33% grade) maximum. IRC R311.8.2.1
Maximum Cross Slope
1:48 maximum. IRC R311.8.2.2
Minimum Clear Ramp Width
36 inches minimum between handrails. IRC R311.8.3
Landings at Top and Bottom
Required at the top and bottom of each ramp run and where ramps change direction. Must be at least as wide as the ramp run and 60 inches long. IRC R311.8.4
Handrail Requirements
Required on both sides of ramps with a rise greater than 6 inches or a horizontal projection greater than 72 inches. IRC R311.8.5
Handrail Height
Between 34 and 38 inches above the ramp surface. IRC R311.8.5.1
Handrail Continuity
Must be continuous for the full length of each ramp run. IRC R311.8.5.2
Handrail Extensions
Extensions required at the top and bottom of ramp runs. IRC R311.8.5.4
Edge Protection
Ramps and landings with a drop-off greater than 30 inches shall have guards. A curb or barrier with a minimum height of 2 inches shall be provided on at least one side of ramp runs and landings. IRC R311.8.6 (and R312.1)
Ramp Surface
Surfaces shall be stable, firm, and slip-resistant. IRC R311.8.7
Structural & Foundation Requirements
7 Rules
Design Loads
Ramps and landings must be designed to support dead and live loads as specified for egress components. Minimum live load for egress components is 40 psf. IRC R301.1.1, Table R301.1.5
Frost Protection
All footings and foundations for exterior ramps must extend to a minimum depth of 42 inches below finished grade or be designed to resist frost heave in accordance with an approved engineered design. IRC R403.1.4.1 (DuPage County local amendment/standard)
Footing Dimensions
Minimum 6-inch thickness and 12-inch width for continuous concrete footings, or appropriately sized for isolated piers based on soil bearing capacity and applied loads. IRC R403.1
Wood in Contact with Ground
All wood members in contact with the ground, concrete, or exposed to weather shall be approved pressure-preservative-treated wood, naturally durable wood, or be naturally decay-resistant. IRC R317.1
Fasteners
Fasteners used in pressure-preservative-treated wood shall be hot-dipped galvanized steel, stainless steel, silicon bronze, or copper. IRC R317.3
Guardrail Height (where required)
Guards are required where the walking surface is more than 30 inches above the adjacent grade. Minimum height 36 inches for residential applications. IRC R312.1.2
Guardrail Openings
Openings in guards shall not allow a 4-inch sphere to pass through. IRC R312.1.3
Site, Drainage, & Environmental Considerations
3 Rules
Site Grading
The site shall be graded to provide drainage away from the ramp structure and adjacent buildings to prevent water accumulation and foundation saturation. IRC R401.3
Material Durability
Materials selected for ramp construction must be suitable for outdoor exposure in DuPage County's climate, resistant to freeze-thaw cycles, moisture, and UV degradation. IRC R317.1 (general implication for treated/durable materials)
Snow and Ice Management
Design should consider ease of snow and ice removal, and material choice should minimize slip hazards in winter conditions.
Electrical Requirements (If Applicable)
4 Rules
Exterior Lighting
Exterior ramps serving an exit or entrance door may require illumination for safety and egress. Verify local amendments. NEC 210.70(A)(2)
Weather-Resistant Wiring & Devices
All electrical wiring, devices (outlets, switches), and fixtures installed in outdoor locations must be listed for wet or damp locations and installed with appropriate weather protection. NEC 410.10(A), 406.9
GFCI Protection
All 120-volt, single-phase, 15- and 20-ampere receptacles installed outdoors shall have ground-fault circuit-interrupter (GFCI) protection for personnel. NEC 210.8(A)(3)
Grounding and Bonding
All non-current-carrying metal parts of electrical equipment and wiring methods must be properly grounded and bonded. NEC 250
Permitting & Inspection Process (DuPage County General Guidance)
4 Rules
Permit Application
A building permit is typically required prior to commencing construction. Contact your local municipality's building department for specific application forms, required plans, and fees.
Required Plans
Construction documents typically include site plans, structural details, dimensions, material specifications, and ADA compliance details (slopes, widths, landings, handrails). Submittals should be to scale.
Inspections
Key inspections commonly include footing/foundation inspection (prior to concrete pour/backfill), framing inspection (prior to decking/finishes), and a final inspection to verify overall code compliance and safe operation. Schedule inspections with the local building department as per their specific requirements.
Final Approval
Occupancy or final approval will be granted upon satisfactory completion of all required inspections and compliance with adopted codes.
