AGV Floor Requirements

Why Floors Are Critical for AGVs

AGVs are more floor-sensitive than manned forklifts. A manned operator compensates for unevenness instinctively; an AGV does not. Floor deviation causes:

• Navigation drift (especially for magnetic tape and laser systems)
• Load tipping at high lift heights (amplified by mast deflection)
• Wheel wear and vibration that degrades sensors
• Joint impacts that damage battery and electronics

F-Number Standards (US)

The F-number system (FF = flatness, FL = levelness) is the US standard for slab-on-grade floors.

Application	FF Minimum	FL Minimum
General commercial warehouse	FF 25	FL 20
Narrow aisle / light AGV	FF 35-50	FL 25-35
AGV free-movement zones	FF 70	FL 50
AGV-dedicated path zones	FF 100	FL 75

Higher FF = flatter. Higher FL = more level. AGV requirements exceed standard warehouse specs by 2-4x.

TR34 Standard (UK / International)

TR34 (Concrete Society Technical Report 34, 4th edition 2016) defines floor categories for industrial use. Defined Movement (DM) classifications apply to VNA and AGV aisles.

TR34 Category	Rack Height	Application
DM1	Top beam >13m	Very high VNA / tall AGV
DM2	Top beam 8-13m	Standard VNA / AGV
DM3	Top beam <8m	Lower rack VNA / pallet jack AGV

Free Movement (FM) classifications apply to open floor areas where AGVs travel without fixed guidance (SLAM-based systems).

Quantitative Deviation Limits

Parameter	Requirement
Max deviation per 3m straightedge	±1.5mm
Max joint differential height	≤1.0mm
Surface roughness (polished/epoxy)	Ra < 30 micrometers
Minimum compressive strength	40-50 MPa
Minimum surface hardness	6 Mohs

Referenced Standards

Standard	Origin	Application
TR34	UK (Concrete Society)	VNA and AGV defined-movement floors
F-number (ASTM E1155)	US	Flatness and levelness measurement
DIN 15185	Germany	VNA warehouse floor requirements
VDMA Guidelines	Germany	AGV floor tolerance guidelines
FEM 10.2.14-1	Europe	Racking installation floor requirements
F-min	US (FACE method)	Robotics and AS/RS floor survey

Practical Notes for Specifying

1. Measure before you commit: Always commission an F-number survey before finalizing an AGV quote. Retrofitting a slab to FF 70+ is expensive ($15-40/sq ft depending on method).
2. New construction: Spec FF 50/FL 35 minimum for any warehouse that may adopt AGVs in Years 1-5. Over-spec is cheaper than remediation.
3. Joint treatment: Saw-cut contraction joints are the biggest failure point. Armor joints with steel edge protection or use joint-free slab pours for AGV lanes.
4. Slope: Maximum 1-2% cross-slope in AGV travel paths. Steeper grades require speed reduction and are a stability risk at full load height.
5. Existing buildings: Use grinding or self-leveling overlays (4-6mm epoxy-bound) to achieve AGV tolerance. Measure before and after with calibrated dipstick or Facemaster.

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Roll Handling AGV — Additional Floor Requirements

Roll handling AGVs (reel fork, roll clamp) carry payloads of 4,000–8,000 kg, producing vehicle + load combinations of 13,000–15,000 kg distributed across 4–6 drive wheels. This is a point load condition that exceeds the design basis of most standard warehouse slabs. A structural engineer must confirm slab capacity before roll handling AGV deployment.

Flatness by Zone

Zone	Minimum FF	Minimum FL	Reason
General travel paths	FF 50	FL 35	Standard AGV minimum
Machine interface / docking positions	FF 70	FL 50	Positioning repeatability ±5–10 mm required
Roll staging lanes	FF 50	FL 35	Floor-stacked rolls tip if slab is out of level
Dock approach (AGV staging, no leveler)	FF 50	FL 35	Grade transition managed at dock threshold

Joint Treatment for Heavy Loads

Standard armored joint inserts are the minimum for roll handling AGV paths. Under repeated crossings by 13,000–15,000 kg vehicles, joint edge chipping is accelerated compared to standard forklift AGV loads.

• Specify full-depth steel armored joint inserts (not surface-applied edge protection) at all saw-cut joints in AGV travel zones
• Joint-free slab pours (post-tensioned or fiber-reinforced) eliminate the problem entirely — preferred for new mill construction where AGV routes are known at design time
• Maximum allowable joint differential after installation: ≤1.0 mm; re-survey at 12-month intervals for the first 3 years under heavy-load AGV operation

Slope Limits

• Maximum 1% cross-slope on main roll handling travel paths (tighter than the general 1–2% for lighter AGVs)
• Elevated horizontal loads — a 2,000 mm roll on forks — increase tip sensitivity; slope compounds the effect
• Grade transitions at door sills and dock thresholds: ≤5 mm vertical offset, ramped at ≤1:12 where possible

Floor Surface for Paper Mill Environments

Standard bare concrete is incompatible with paper mill production areas. Pulp slurry, process water, bleach, and chemical sizing agents attack untreated concrete and degrade surface hardness below the 6 Mohs minimum required for AGV wheel wear performance.

• Specify chemical-resistant epoxy or polyurethane coating on all AGV travel surfaces in production zones
• Include anti-slip aggregate in the top coat — wet floors from mill condensation and process water create slip risk for AGV wheels (reduced traction affects stopping distance and navigation accuracy)
• Recoat cycle: inspect annually; recoat when wear exposes aggregate or when surface hardness testing drops below specification
• Floor drain gratings in AGV paths: flush-mounted only, ≤5 mm projection, rated for point load of the heaviest vehicle at maximum payload