Ask what supports the surface

Start with the existing ground

Describe what is there now: asphalt, concrete, pavers, soil, a repaired area, or a mix of surfaces. Photograph soft edges, settlement, exposed roots, standing water, broken slabs, and places where the surface meets the street or building. Note whether heavy vehicles, deliveries, or pedestrians use the area.

These observations do not determine the remedy. They identify conditions that the proposal should address or leave open for review. Ask which parts can be evaluated from the initial information and which require removal, testing, or a site assessment.

• Current surface and areas to retain
• Visible settlement, cracks, soft edges, or roots
• Vehicle, delivery, and pedestrian use
• Water or moisture observations

Know the role of base and subgrade

FHWA describes the subgrade as the prepared or natural ground that supports the pavement structure. A base or subbase can provide stable support, help distribute traffic loads, and support drainage when the design calls for it. The exact arrangement depends on the material, site, use, and local conditions.

That is why a polished surface image cannot explain the whole project. Ask the contractor to identify the surface, the support layers, the ground assumption, and the conditions that could change the scope. A good explanation uses the property you can see, not only a generic layer name.

Separate included preparation from unknowns

A proposal should make clear what preparation is included and what happens if the existing ground differs from the assumption. Ask how unsuitable material, hidden drainage, old slabs, buried edges, or access limitations would be recorded and approved before extra work proceeds.

Keep those questions beside the written scope. If one proposal includes removal and another describes only the new surface, the totals do not describe the same work. Comparing equivalent boundaries protects the decision from a low visible number that leaves preparation unstated.

Connect preparation to water

Preparation and drainage are linked. FHWA notes that aggregate layers can support the pavement and, when designed for it, provide drainage. Ask where water travels beneath or beside the surface, how existing drains are considered, and which edges need a clear connection.

Do not treat a base layer as a universal drainage solution. Its material, grading, depth, and outlet details belong to the project design. Your role is to make the observed water path visible and ask how the proposed layers respond to it.

Review the preparation record

Before work begins, keep the accepted scope, photos, marked boundaries, material choice, and open conditions together. If the crew finds something different, ask for a written explanation of the change and its effect on the project boundary before deciding.

This record is useful after installation too. It tells you which areas were prepared, which existing features were retained, and which care or access instructions relate to the surface you selected.

Common questions