Pavement Glossary
Pavement work comes with its own vocabulary. These plain-English definitions help property owners, managers, HOA boards, and facility teams understand the terms that show up in contractor proposals and site walks — so you can read a bid and ask better questions. Terms link to the relevant contractor categories where useful.
A
- Access aisle
- The striped, level area beside an accessible parking stall that gives a wheelchair user room to enter and exit a vehicle. It is a required part of an ADA-compliant accessible stall, not an optional add-on.
- Accessible route
- A continuous, unobstructed path a person with a disability can use to travel between parking, entrances, and site features. Slope, width, surface, and changes in level along the route are all governed by accessibility requirements.
- ADA
- The Americans with Disabilities Act, a federal civil-rights law with accessibility requirements that affect parking, routes, ramps, and signage. Specific technical rules also vary by state and local code, so ADA work often involves qualified professionals. See the ADA parking contractors category.
- Aggregate
- The crushed stone, gravel, and sand that make up most of asphalt and concrete by volume. Aggregate gradation (the mix of particle sizes) affects strength, durability, and surface texture.See also: Asphalt (Hot Mix Asphalt), Base course
- Alligator cracking
- Interconnected cracks that resemble alligator skin, caused by fatigue and usually a failing base underneath. It signals structural failure, so it typically needs repair rather than a surface treatment like sealcoating.
- Asphalt (Hot Mix Asphalt)
- A pavement material made of aggregate bound together with asphalt binder (an oil-based product), usually placed and compacted hot. It is flexible, relatively fast to install, and maintainable with sealcoating and crack sealing. Browse asphalt paving contractors.
B
- Base course
- The compacted layer of aggregate beneath the asphalt or concrete that carries the load and spreads it to the subgrade. A weak or failing base is the most common reason pavement fails early, and paving over a bad base rarely lasts.See also: Subgrade, Aggregate, Alligator cracking
- Binder (asphalt binder)
- The petroleum-based cement that holds asphalt aggregate together. As binder ages and oxidizes, pavement becomes brittle and gray — the point at which sealcoating is meant to help protect the surface.See also: Asphalt (Hot Mix Asphalt), Oxidation, Sealcoat
C
- Catch basin
- A drainage inlet that collects surface water from pavement and directs it into the storm system. Damaged or clogged catch basins cause ponding and accelerate pavement failure around them.
- Compaction
- Rolling or tamping asphalt, aggregate, or soil to remove air voids and reach its designed density and strength. Loose asphalt compacts roughly 20–25%, which is why bids should state compacted, not loose, thickness.See also: Lift, Asphalt (Hot Mix Asphalt), Base course
- Concrete (Portland Cement Concrete)
- A rigid pavement material of aggregate bound by portland cement. It costs more than asphalt up front but is durable and long-lasting, and is common for sidewalks, curbs, aprons, and heavy-load areas. See concrete repair contractors.
- Control joint
- A planned groove cut or tooled into concrete so that inevitable shrinkage cracking happens along the joint instead of randomly across the slab. Expansion joints, by contrast, allow slabs to move without pushing against each other.
- Crack filling
- Placing material into a crack to block water, generally for narrower or non-working cracks. It is lower cost and shorter lived than crack sealing. Compare pricing in the crack sealing cost guide.Crack Sealing ContractorsSee also: Crack sealing, Routing
- Crack sealing
- Applying a flexible, usually hot-applied rubberized sealant into cracks (often after routing) so it bonds to the crack walls and flexes as pavement moves. It is the lowest-cost way to keep water out and defer larger repairs. See crack sealing contractors.Crack Sealing ContractorsSee also: Crack filling, Routing, Sealcoat
- Curb and gutter
- The concrete edge and channel that contain a pavement area and direct water toward drainage inlets. Damaged curb and gutter is usually replaced in sections and priced by the linear foot.
F
- Fire lane
- A marked, no-parking zone that keeps emergency-vehicle access clear, defined by local fire code. Fire-lane striping, curb painting, and signage are common line items in a striping project.
- Full-depth reclamation
- A rehabilitation method that pulverizes the existing asphalt and part of the base, blends it, and re-compacts it as a new base for fresh pavement. It reuses materials in place and is an alternative to full removal and replacement.Asphalt Paving ContractorsSee also: Base course, Overlay, Milling
G
- Grading
- Shaping the ground or pavement surface to defined elevations and slopes, primarily so water drains away rather than pooling. Proper grading is fundamental to pavement life. See drainage and sitework contractors.
L
- Lift
- A single layer of asphalt placed and compacted in one pass. Thicker pavements are built in multiple lifts because each layer can only be compacted properly up to a certain thickness.See also: Compaction, Asphalt (Hot Mix Asphalt)
M
- Milling
- Grinding off a controlled depth of existing asphalt with a milling machine, often before an overlay so the new surface ties in at the right elevation. A common pairing is 'mill and overlay.'
- Mobilization
- The cost and effort of getting crews and equipment to a job site and set up. Because it is largely fixed, small jobs carry a higher cost per square foot and often a minimum fee.See also: Asphalt (Hot Mix Asphalt)
- Mudjacking (slab jacking)
- Lifting a settled but intact concrete slab back to grade by pumping material beneath it, using either a cement slurry or polyurethane foam. It can cost far less than removing and replacing the slab.
O
- Overlay
- Placing a new layer of asphalt over existing pavement. It is cheaper than full replacement but only performs when the existing pavement and base are structurally sound; overlaying failing pavement usually reflects the old cracks through quickly.
- Oxidation
- The aging of asphalt as its binder reacts with air and sunlight, turning the surface gray and brittle and making it prone to raveling and cracking. Sealcoating is intended to slow this process on sound pavement.See also: Binder (asphalt binder), Sealcoat, Raveling
P
- Parking stall
- A single marked parking space. Striping is frequently priced per stall, and stall dimensions, layout, and count are affected by local code and ADA requirements.
- Pavement management
- A planned, multi-year approach to inspecting pavement and scheduling maintenance and repairs to lowest lifecycle cost, rather than reacting to failures. On-schedule maintenance defers far costlier resurfacing. See parking lot maintenance cost.
- Ponding (birdbath)
- Standing water that lingers on pavement after rain because the surface does not drain, often called a birdbath when localized. Ponding accelerates deterioration and can indicate grading or drainage problems.
- Positive drainage
- A surface graded so water flows continuously toward inlets or off the pavement without pooling. Achieving positive drainage is one of the most important factors in how long pavement lasts.
- Pothole
- A bowl-shaped hole formed when water and traffic break down weakened pavement, often after alligator cracking. Potholes usually need full-depth patching rather than a surface fix.
R
- Raveling
- The progressive loss of aggregate from an asphalt surface, leaving it rough and loose. It is a sign of an aging, oxidized, or poorly compacted surface.See also: Oxidation, Sealcoat, Compaction
- Routing
- Cutting a crack into a clean, uniform channel before sealing so the sealant bonds well and lasts longer. Routing adds labor and cost but improves crack-sealing performance on wider or working cracks.
- Running slope and cross slope
- Running slope is the grade along the direction of travel; cross slope is the grade across it. Both are limited on accessible routes and parking, where too much slope can create a compliance problem.ADA Parking ContractorsSee also: Accessible route, ADA, Grading
S
- Sealcoat
- A thin protective coating applied over sound asphalt to slow oxidation, resist fuel and water, and refresh appearance. It is maintenance, not repair — it will not fix structural damage or bridge working cracks. See sealcoating contractors.
- Spalling
- Flaking, chipping, or surface breakdown of concrete, often from freeze-thaw cycles, de-icing salts, or poor finishing. Depending on depth, it may be resurfaced or require slab replacement.
- Subgrade
- The native soil beneath the base layer that ultimately supports the pavement. Soft or unstable subgrade can cause failures no amount of surface work will fix.See also: Base course, Compaction, Alligator cracking
T
- Tack coat
- A thin sprayed layer of asphalt emulsion that bonds a new asphalt lift to the surface below it. Skipping or under-applying tack coat can cause layers to slip and fail at the interface.See also: Asphalt (Hot Mix Asphalt), Lift, Overlay
- Thermoplastic
- A durable, heat-applied pavement marking material used for high-traffic lines, crosswalks, and symbols. It costs more than paint but lasts longer, which often lowers the cost per year. See striping cost.
- Trip hazard
- A change in surface level — commonly a lifted or settled concrete joint — that can catch a foot or wheel. Small hazards can often be ground down or lifted rather than replaced, though accessible-route hazards can also raise compliance questions.
- Truncated domes (detectable warnings)
- The raised bumps on curb ramps and transitions that alert people with visual impairments to a hazard such as a street crossing. They are a required detectable-warning element where accessible routes meet vehicle areas.
Looking for a pavement contractor?
Use The Pavement Directory to search asphalt, concrete, sealcoating, striping, ADA access, and pavement maintenance contractors by service and location. Always verify license, insurance, references, and written scope before hiring.
Search contractorsAre you a pavement contractor?
Contractors can add or claim a company profile to help property owners find pavement professionals by service, location, and specialty.