A beautiful new asphalt driveway starts long before the asphalt arrives.
For homeowners in Amherst, Hollis, Nashua, Milford, and surrounding Southern New Hampshire communities, proper site preparation is one of the most important factors in getting a driveway that performs well for years. Asphalt is only the finished surface. The strength and stability underneath it determine how well that surface handles vehicles, water, snow, and New Hampshire’s freeze-thaw cycles.
What Happens Before Asphalt Is Installed?
Professional driveway paving typically begins with excavation and preparation of the existing ground. Theriault & Sons explains that driveway preparation may involve excavating approximately 10 inches below the finished grade and installing at least 6 inches of compacted ¾-inch crushed gravel.
Why is that important?
The gravel base provides structural support and helps create a stable foundation for the asphalt. Without adequate preparation, a driveway may develop settling, cracks, depressions, or drainage problems even when the asphalt itself initially looks excellent.
Drainage Is Part of the Foundation
Water is one of the biggest threats to pavement.
If water cannot move away from the driveway properly, it can collect beneath or alongside the pavement. In Southern New Hampshire, repeated freezing and thawing can make existing weaknesses more noticeable over time.
That’s why grading and drainage should be considered before paving begins. Theriault & Sons provides site work, grading, drainage solutions, retaining wall installation, and excavation as part of its broader site-work services.
A paving contractor should look beyond the surface and consider questions such as:
- Where will rainwater and snowmelt go?
- Is the existing grade appropriate?
- Are there soft or unstable areas?
- Is an old driveway hiding drainage problems?
- Will a culvert be necessary?
- Does the property need additional excavation or grading?
Addressing these questions before paving can prevent expensive problems later.
Why the Lowest Paving Quote Isn’t Always the Best Value
Two contractors can quote the same driveway but propose very different levels of preparation.
One estimate may include substantial excavation, a properly compacted aggregate base, drainage work, and multiple asphalt layers. Another may assume that much of the existing material can remain.
The final price matters, but so does understanding exactly what you are paying for.
When reviewing a paving estimate, ask about excavation depth, base material, compaction, drainage, asphalt thickness, edge treatment, and whether repairs to the existing subgrade are included.
New Hampshire Weather Makes Preparation Even More Important
A driveway in Southern New Hampshire has to withstand more than summer traffic. Snow, ice, plowing, spring moisture, and repeated freeze-thaw cycles all place demands on pavement.
Professional asphalt paving gives homeowners a surface designed for everyday use and easier snow removal, but the foundation underneath remains critical.
Planning a New Driveway?
Whether you need a new asphalt driveway, an addition, drainage work, or related excavation, Theriault & Sons handles the site preparation and paving process together.
Since 1956, this family-run company has served homeowners and businesses throughout Southern New Hampshire. A no-obligation estimate gives you an opportunity to discuss your property, options, and budget before making a decision.