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VNA Floor Flatness
Very narrow aisle (VNA) warehouse trucks follow defined wheel paths. General floor flatness and levelness results do not establish that those paths meet the truck’s operating requirements.
FF/FL measurements and F-min evaluate different aspects of floor geometry. They cannot be converted directly into one another, and a general slab result does not replace the required wheel-path assessment.
Why wheel paths need their own assessment
A truck travelling along a fixed aisle repeatedly encounters the same surface profile. Measurements taken elsewhere across the slab can miss conditions within those wheel paths.
Face Consultants distinguishes between free-movement floors and defined-traffic floors. Its guidance explains that random FF/FL measurements cannot substitute for the defined-traffic assessment used for VNA aisles.
Our concrete flatness guide explains the separate issue of slab flatness at placement and when polishing begins.
How F-min differs from FF/FL
| Measurement | What it addresses | Important limitation |
|---|---|---|
| FF/FL | Floor flatness and levelness assessed through the applicable sampling method | General slab results do not establish the condition of every defined truck wheel path. |
| F-min | The worst acceptable flatness and levelness conditions in a defined-traffic aisle, as described by Face Consultants | F-min is not an average and has no direct conversion from FF/FL. |
Face Consultants describes the selected F-min value as dependent on the expected lift truck and rack height. The project therefore needs an equipment-specific requirement.
Plan floor-geometry acceptance before polishing
Before polishing work proceeds, the project team should identify the truck equipment, wheel paths, applicable specification, measurement method and who provides certification. The DoD warehouse example shows what one document requires a specification to call for, though its provisions are not universal. An approved polished appearance does not establish compliance with the truck’s floor-geometry requirements.
Establish the measurement and acceptance plan
Before polishing work proceeds, the project team should identify:
- The truck equipment and operating requirements.
- The aisle layout and defined wheel paths.
- The applicable floor-geometry specification.
- The required measurement coverage and method.
- Who performs the measurements and provides certification.
- How any required correction will be coordinated with the finished floor.
Face Consultants recommends continuous measurement along defined wheel paths. This is supplier guidance, not a universal requirement imposed by every floor specification.
Our polished concrete quality guide explains how these checks fit alongside appearance and other acceptance requirements.
A project-specific example: DoD warehouse requirements
UFC 4-440-01, with Change 1, includes requirements for turret-truck and order-picking-truck operations in DoD warehouses.
Section 3-7.4.2.2 requires the specification to call for:
- Complete profile analysis of the wheel-path portions within storage aisles.
- Statistical profile analysis of other floor portions used by those trucks.
- Specialized floor-profile measurement equipment or an equivalent technique.
- Certification prepared by the measuring-equipment operator and provided by the general contractor.
The certification addresses the truck manufacturer’s maximum-rated-productivity floor-flatness requirements.
These provisions apply to the operations and projects covered by that document. They are not universal requirements for every warehouse or forklift floor.
Polishing and geometry acceptance are separate
An approved polished appearance does not establish compliance with a truck’s floor-geometry requirements. The measurement and certification process remains separate.
The cited UFC requires correction as directed by the Contracting Officer and does not prescribe grinding.
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Frequently Asked Questions
No. Face Consultants describes FF/FL and F-min as different measuring systems with no direct correlation or corresponding conversion index. A general slab result cannot substitute for the required defined-traffic assessment.
No. Polished appearance and floor geometry are separate acceptance questions. The truck’s wheel paths need to be evaluated against the applicable equipment and project requirements.
An average can conceal a localized condition that a truck encounters repeatedly. Face Consultants describes F-min as addressing the worst acceptable conditions in the aisle rather than an average result.
Not necessarily. The cited UFC warehouse provision directs correction as instructed by the Contracting Officer without prescribing grinding. The appropriate response must follow the project requirements and the conditions found.
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