Is Your Parking Lot Permeable? What to Confirm Before Maintenance
Before ordering maintenance for a parking lot that may contain permeable pavement, confirm the pavement type and mark its boundaries. Request the original plans and maintenance instructions, then have the proposed treatment reviewed for that system. A work order that simply says to treat the entire lot leaves an important question unanswered: are all of its surfaces supposed to function the same way?
The pavement can also be part of the drainage system
The EPA describes permeable pavement as a family of surfaces that let rain and snowmelt pass through to underlying layers. Examples include pervious concrete, porous asphalt, and permeable paving systems. This is different from assuming that every paved area should send all its water across the surface toward a drain.
For an owner taking over a commercial property in Middle Tennessee, the practical starting point is identification, not a product purchase. Ask the seller, previous manager, or project designer whether any pavement was installed as a stormwater feature. If the answer is uncertain, record that uncertainty in the maintenance request instead of selecting a treatment based on appearance.
Recover the records before defining the job
Create a small identification file with the site plan, pavement specifications, available construction records, and any system-specific care instructions. Look for a named pavement type and an identifiable location. A generic invoice for asphalt work is less helpful than a drawing showing exactly which stalls or lanes received a particular system. Ask whoever supplies the documents to identify whether they describe the proposed construction or the completed work.
Do not quietly fill gaps with assumptions. Keep a short list of open questions: Does this drawing cover the whole property? Was the entrance replaced later? Is there a separate maintenance document for the parking stalls? Who can explain a note that the current management team does not understand? Send those questions with the records so the contractor knows which details need confirmation.
If the original documents cannot be located, request an identification visit before authorizing treatment. Ask what the reviewer can establish from the visit, what remains uncertain, and whether a designer or specialist needs to be involved. The immediate deliverable can be a documented assessment rather than a quotation for work whose suitability has not been established.
Draw boundaries that a crew can actually follow
Use one annotated property map for the maintenance discussion. Give each distinct area a plain name, such as north parking stalls, entrance lane, or rear service court. Add photographs taken from recognizable landmarks. Match those names to the estimate so a sentence about one area cannot accidentally be read as an instruction for the entire property.
As a planning example, imagine a proposal with a single line for parking lot maintenance and a single total area. Before approving it, ask the estimator to show where that area begins and ends. If one part of the lot has an unresolved pavement type, identify it as excluded pending review. This is a scope-writing example, not a description of a Milliken project.
Check that the final map reaches the person supervising the work, not only the person preparing the estimate. At the pre-work walkthrough, ask the crew lead to explain the boundaries back to you. Resolve a disagreement before equipment begins work rather than relying on a later invoice to reveal which interpretation was used.
Do not carry over a conventional asphalt treatment automatically
FHWA's technical brief on porous asphalt pavements with stone reservoirs cautions against sealcoating or crack sealing those pavements. It also explains that an open-graded surface over dense pavement is not the same system as porous asphalt over a stone reservoir. A surface that looks coarse is therefore not enough information to select a maintenance approach.
That distinction belongs in the approval process. Ask the contractor to name the surface being treated, describe the proposed operation, and identify the system guidance supporting it. If the recommendation changes after records are reviewed, request a revised written scope. Do not leave an earlier, incompatible description attached to an otherwise updated price.
Treat repair questions separately from cleaning questions. Ask whether the visit is intended to remove accumulated material, investigate a concern, or repair physical damage. Have the proposal distinguish those tasks and state which decisions require a separate assessment. One broad promise to improve the pavement should not substitute for a description of the actual work.
Ask how cleaning will be selected and assessed
EPA's green infrastructure maintenance guidance identifies vacuum-powered sweeping as a suitable maintenance approach for permeable pavement and notes that specialized equipment or experience may be needed. It also emphasizes inspections and documented maintenance. These are useful starting points for a conversation, not a universal cleaning schedule or a specification for every property.
Ask a prospective provider what equipment they propose for your identified surface and why. Request that they explain what a completed service includes and what it does not establish. Will they supply photographs, note areas they could not reach, or recommend further evaluation? Agree on that reporting scope before the visit so both sides understand what evidence will accompany the invoice.
Avoid defining success only as a more uniform appearance. Ask the system reviewer whether performance checks are needed and who should carry them out. Keep any assessment of drainage function separate from a cosmetic observation. If a provider cannot evaluate a concern within the agreed service, ask for that limitation to be recorded rather than accepting an unsupported assurance.
Put the identification into everyday purchasing decisions
Once the pavement has been identified, attach the confirmed map and instructions to future requests for work. Include a contact for questions and a clear instruction to obtain approval before changing the agreed method. This gives a replacement property manager or purchasing assistant a usable starting point without requiring them to reconstruct the entire project history.
For a Nashville or Gallatin property, Milliken's current asphalt services page is a starting point for discussing parking lot repairs and maintenance. Its service-area page invites owners to confirm project coverage and scope. Those pages do not establish that a particular permeable-pavement service is available. Describe the system and ask directly whether the team can address it or whether another specialist should participate.
Frequently asked questions
Can I identify permeable pavement from a photograph?
A photograph can help a reviewer understand the location and visible texture, but it does not document the complete system. Pair photographs with construction records and ask for an assessment if the pavement type remains uncertain.
Should porous asphalt receive the same sealcoating as conventional asphalt?
No. FHWA specifically cautions against sealcoating porous asphalt pavements with stone reservoirs. Confirm the system before ordering work, and have maintenance recommendations reviewed for that pavement.
What if the quote is already approved when uncertainty comes up?
Contact the contractor before work begins and identify the affected area. Request a written clarification or revised scope that resolves the pavement identification and treatment question. Keep the approved revision with the work order.