Type 2 Aggregate: A Strong Foundation for Your Project
When it comes to building a reliable base for roads, driveways, or heavy-use areas, Type 2 aggregate is a go-to choice for contractors and engineers across the Greater Boston area. It’s known for its strength, affordability, and long-term performance — and at Ottr, we make it easy to get it delivered right to your job site.
Here’s everything you need to know about what Type 2 aggregate is, how it’s made, where it’s used, and why it might be the right material for your next project.
What Is Type 2 Aggregate?
Type 2 aggregate — also known as granular sub-base (GSB) — is a blend of crushed stone, gravel, and fines that compacts into a firm, stable foundation. It’s most commonly used as a base layer for roads, driveways, parking lots, and other pavement systems that need to support heavy loads.
Its composition makes it ideal for absorbing impact, distributing weight, and resisting shifting or erosion over time. This makes Type 2 aggregate a smart option for any high-traffic or heavy-duty surface.
How Is Type 2 Aggregate Made?
Type 2 is produced by crushing and screening durable rock types like limestone, granite, or basalt. These materials are selected for their strength and weather resistance. Once crushed, the mix is graded by size and can include particles ranging from coarse gravel to fine dust — perfect for compacting into a solid sub-base.
In most projects, it’s installed, watered, and compacted to form a tightly bound layer that’s ready for asphalt, concrete, or pavers.
What Is Type 2 Aggregate Used For?
You’ll most often see Type 2 used for:
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Road base for streets, highways, and private roads
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Driveway and parking lot prep under asphalt or concrete
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Commercial site grading
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Retaining wall backfill
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Walkway or patio foundations
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Drainage improvement and erosion control
Because it compacts so well and holds up under pressure, it’s also used in landscaping projects to create a strong base beneath decorative materials like crushed stone or pavers.
Pros & Cons of Using Type 2 Aggregate
Pros
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Excellent compaction and load-bearing strength
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Durable and weather-resistant
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Cost-effective compared to concrete or asphalt
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Versatile for both structural and aesthetic projects
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Eco-friendly, often made from recycled or natural materials
Cons
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Quality can vary depending on the supplier
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Requires proper moisture and compaction for best results
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Not ideal for DIY use without heavy equipment
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May require drainage considerations in wetter soil conditions
How Much Does Type 2 Aggregate Cost?
Prices vary based on location, quantity, and material type. In areas like Greater Boston where demand is high and transportation adds cost, bulk pricing is your best bet. At Ottr, we offer transparent pricing, bulk discounts, and a delivery-first model that makes your material costs easy to plan for.
FAQs About Type 2 Aggregate
Q: Is Type 2 aggregate good for driveways?
Yes — it’s one of the most common materials used as a base layer for driveways. It compacts firmly and helps prevent sinking or cracking.
Q: Can I install Type 2 aggregate myself?
For small landscaping projects, you can work with compacted base layers. But for structural use or road base, we recommend professional installation using heavy compaction equipment.
Q: What size is Type 2 aggregate?
It typically ranges from ¾" to 1 ½" in size, with fine particles mixed in to help it bind together.
Q: How is Type 2 delivered?
Ottr delivers Type 2 aggregate in bulk via dump truck. You pick your delivery date at checkout — we’ll confirm and drop the material where you need it.
Q: How long does it last?
With proper installation and compaction, Type 2 aggregate forms a base that can last 10–20 years or more, depending on conditions and use.
Order Type 2 Aggregate Online with Ottr
Ottr makes it easy to order bulk materials like Type 2 aggregate online. Just enter your address, use the on-page calculator to estimate how much you need, and schedule your delivery — all from your phone or computer.
Looking for expert recommendations or a custom quote for larger jobs? Message our team and we’ll get you everything you need to keep your project moving forward.