A driveway is one of the largest concrete or asphalt surfaces most homeowners will ever commission — and one of the most aggressively marketed. Every spring, driveway sealing and paving companies blanket neighborhoods with door-to-door crews offering deals on “leftover material from a job down the street.” The results range from mediocre to fraudulent, and the homeowner is left with a thin coat of tar-like material on their existing driveway that peels off within a season.
Beyond the fly-by-night sealing operations, legitimate driveway installation is a trade where the visible surface tells you almost nothing about the quality of what’s underneath. An asphalt driveway installed on a well-prepared granular base will last 20–25 years. The same asphalt installed on a poorly prepared or inadequate base will crack, settle, and heave within five years — and look perfectly acceptable on day one.
The questions in this guide apply whether you’re replacing an existing driveway, installing a new one, sealing an existing asphalt surface, or repairing damaged concrete.
“The base is everything in driveway construction. Every asphalt driveway that fails prematurely failed because of the base — not the asphalt itself. The asphalt is 2–3 inches of material. The base is 6–12 inches of compacted granular that costs more and takes longer to install correctly. That’s where cheap quotes cut corners, and it’s completely invisible the day the job is done.”
— Johny K. from EcoSeal Services, asphalt driveway and concrete restoration specialist with over 20 years of experience providing exterior restoration, sealing, and surface protection services across Toronto and the GTA
Table of Contents
Before You Call Anyone
Asphalt or concrete — which is right for your driveway?
The two most common driveway materials have genuine trade-offs:
Asphalt:
– Lower upfront cost ($4–$10 per sq ft installed vs. $8–$20 for concrete)
– Softer surface — more forgiving of minor base imperfections
– Requires sealing every 3–5 years to maintain appearance and slow surface oxidation
– More susceptible to damage from petroleum products (oil leaks)
– Can be repaired and patched more easily than concrete
– Typical lifespan: 20–25 years with proper base and maintenance
– Better performance in freeze-thaw cycles than concrete in some conditions (more flexible)
Concrete:
– Higher upfront cost
– Very durable and long-lasting (30–40 years with proper installation)
– Lower ongoing maintenance — no sealing required
– More susceptible to damage from de-icing salts (surface scaling)
– Harder to repair invisibly — patches are visible
– Requires control joints to manage cracking
– Excellent appearance when new; surface staining is visible
Interlock pavers: A premium alternative covered in the Landscaping & Hardscaping cluster.
Is this a new installation or a replacement?
New installation requires different decisions from replacement:
– New installation: Base preparation starts from native soil. Base design and compaction are everything.
– Replacement: The existing driveway must be removed (additional cost). The existing base may be usable or may need supplementing.
Questions to Ask Before Hiring
Are you a licensed business with insurance and workers’ compensation coverage?
Driveway paving involves heavy equipment, hot materials, and crew members working on your property. Liability insurance covers damage to your property, neighboring properties, or landscaping during the work. Workers’ compensation coverage covers workers if injured.
Ask for a certificate of insurance and a workers’ compensation coverage Clearance Certificate. Verify both.
What a good answer looks like: A registered business with verifiable insurance and workers’ compensation coverage clearance.
Is this your own crew or subcontracted labor?
Some driveway companies operate as brokers — they sell the job and subcontract the installation to crews they don’t directly manage. Ask who will actually be doing the work and whether the salesperson will be supervising the crew.
Can you show me completed driveways from 3 or more years ago?
Recent installations look good regardless of base quality. The test is how a driveway looks after several winters. Ask for references from installations that have been in place for at least three years and that you can visit or photograph.
For a full guide: Questions to Ask a Driveway Contractor for References
The Most Important Questions — Base Preparation
What depth of granular base will be installed?
This is the most important technical question for any driveway installation. Ask specifically:
For asphalt driveways:
– Residential driveways without heavy vehicle access: minimum 6″ (150mm) of compacted granular base
– Driveways with heavy vehicles (RVs, trucks, boats): 8–12″ (200–300mm)
– Light vehicle access (passenger cars only): may be adequate at 4–6″ in some conditions
For concrete driveways:
– Minimum 4–6″ (100–150mm) of compacted granular base
– The concrete itself is typically 4″ (100mm) thick, sometimes 5–6″ for heavier use
Ask for the specific depth in inches and confirm it’s specified in the written contract.
What a good answer looks like: A specific depth stated in writing, appropriate for the vehicle loads expected.
What granular material is being used for the base?
The base must be compactable, free-draining crushed stone — not native soil, not rounded gravel. HL3 crushed limestone (or equivalent) is the appropriate specification for your region driveway bases.
What a good answer looks like: A specific crushed stone product named, not “gravel” or “fill.”
How will the base be compacted?
Proper base compaction requires a plate compactor or roller. Ask whether the base will be compacted in lifts (layers) rather than all at once. Compacting 12″ of granular all at once doesn’t adequately compact the lower portion.
For more: Questions to Ask a Driveway Contractor About Base Preparation and Drainage
Asphalt-Specific Questions
What thickness of asphalt is being installed?
Residential driveway asphalt is typically installed in one or two lifts:
Single lift: One layer, typically 2.5–3″ compacted thickness. Appropriate for light residential use.
Two lifts: A base course (HL3 or HL4 asphalt, coarser aggregate) plus a surface course (HL3, finer aggregate). Total compacted thickness typically 3–4″. Better performance and longevity than single lift.
Ask specifically what compacted asphalt thickness is being installed and whether it’s single or double lift.
What asphalt mix is being used?
Asphalt mix type matters. In many regions:
HL3 (surface course): The standard residential surface mix. Fine aggregate, smooth finish. Used as the final wearing surface.
HL4 / HL8 (base course): Coarser mixes used as a base layer in two-lift installations.
Ask what mix designation is being used and whether the material is coming directly from a licensed hot mix plant (not material from a job site that has been sitting and cooling — this is a major quality shortcut).
When is the material being delivered and from which plant?
Hot mix asphalt must be laid at a minimum temperature (typically above 120–135°C) to compact properly. Material that has been sitting in a truck for hours, or material from a distant plant, arrives at a lower temperature and doesn’t compact properly. Ask which plant the material is coming from and whether the job is scheduled to begin immediately after delivery.
Red flag: Crews offering to pave your driveway from “leftover material” on a truck. This material is almost always too cool to compact properly.
For more: Questions to Ask a Driveway Contractor About Asphalt Installation
Concrete-Specific Questions
What concrete mix strength is being used?
Concrete is specified by compressive strength in MPa (megapascals). For residential driveways in many regions:
- Minimum 32 MPa is standard for residential driveways
- 35 MPa or higher is recommended for cold climates and frequent de-icing salt exposure
- Air-entrained concrete (with small air bubbles intentionally added) is essential in freeze-thaw climates — it significantly improves resistance to scaling caused by de-icing salts
Ask specifically: what MPa rating and whether the mix is air-entrained.
What a good answer looks like: “We use 32 MPa air-entrained concrete for all residential driveways.”
How will control joints be placed?
Concrete cracks. Control joints (saw cuts or tooled joints) are placed to control where cracking occurs — at predetermined locations rather than randomly across the surface. Ask how joints will be spaced and whether they’ll be sawn or tooled.
For a residential driveway, control joints are typically placed every 10–12 feet.
What curing method will be used?
Concrete gains strength through a chemical hydration process that requires moisture and moderate temperature. Freshly placed concrete must be cured — kept moist and protected from extreme temperature — for at least 7 days after placement. Ask what curing method will be used: curing compound, wet burlap, or plastic sheeting.
For more: Questions to Ask a Driveway Contractor About Concrete Installation
Sealing and Maintenance Questions
For asphalt: when should I first seal this driveway?
New asphalt should not be sealed immediately — it needs time to cure and harden (typically 6–12 months minimum). Sealing too soon can actually soften the surface. Ask the contractor when to first seal and what type of sealer is appropriate.
For concrete: what products should NOT be used on this driveway?
De-icing salts — particularly sodium chloride (road salt) and calcium chloride — cause surface scaling in concrete, particularly in the first year or two. Ask specifically what products to avoid and what the recommended de-icing approach is for a new concrete driveway.
Red Flags to Watch For
No base depth specified in the quote. A quote for “asphalt driveway installed” without a base depth specification is hiding the most important quality indicator.
“Leftover material” offered from a truck. This is almost always too cold to compact properly and will produce a soft, unstable surface that fails quickly.
Door-to-door sales with same-day pressure. Legitimate driveway contractors don’t cold-canvass neighborhoods with trucks of “leftover material.” This is one of the most well-documented consumer fraud patterns in home improvement.
Price dramatically lower than all others. Base preparation is where costs are cut. A dramatically lower price almost always means inadequate base depth or material.
No written contract. Always get the base depth, asphalt thickness or concrete specification, and warranty in writing before work begins.
For a full guide: Red Flags When Hiring a Concrete or Asphalt Driveway Contractor
Before They Start: A Quick Checklist
- Business registration and insurance verified
- Workers’ compensation coverage clearance verified
- Written quote with base depth, material type, and surface thickness specified
- Asphalt plant named and delivery timing confirmed
- Drainage plan discussed
- Warranty terms in writing
- Payment schedule agreed
Related Questions
- Questions to Ask a Driveway Contractor for References
- Questions to Ask a Driveway Contractor About Base Preparation and Drainage
- Questions to Ask a Driveway Contractor About Asphalt Installation
- Questions to Ask a Driveway Contractor About Concrete Installation
- Questions to Ask When Getting a Driveway Quote
- Questions to Ask a Driveway Contractor During the Job
- How Much Does a New Driveway Cost ?
- Red Flags When Hiring a Concrete or Asphalt Driveway Contractor
- What to Do If a Driveway Contractor Does Bad Work
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