Trap Rock (1 1/2")

Trap Rock (1 1/2"): Technical Overview and Practical Uses

Trap Rock (1 1/2"), also known as 1 1/2" Crushed Stone, is a hard, dense igneous rock. Common synonyms include Traprock, Crushed Trap Rock, and, in some regions, Basalt. The material is dark gray to black and features a distinct angular, crushed shape. This stone is produced by crushing larger rock to a nominal size of 1 1/2 inches, though actual sizes may range from about 1 inch to 2 inches due to the crushing process. Trap Rock is chemically inert in most environments and is non-porous, with low water absorption. It is free from organic material and typically meets ASTM C33 standards for concrete aggregates when specified.

Trap Rock (1 1/2") is known for its high resistance to abrasion and weathering, making it suitable for heavy-duty construction projects. Its high specific gravity and bulk density (typically 150-170 lbs/ft³) provide excellent compaction and stability. The angular shape of the particles promotes interlock, which is important for structural applications. The product is generally washed or unwashed, depending on the intended use, and is free from deleterious materials such as clay, silt, and organic matter.

Common Applications and Limitations

Trap Rock (1 1/2") is widely used in a variety of construction and landscaping projects. It is commonly selected for railroad ballast, road base, drainage stone, erosion control (such as riprap and slope stabilization), concrete aggregate (when meeting specific standards), gabion fill, and as an underlayment for driveways and parking lots. In landscaping, it serves as a stable fill for retaining walls and other structural features. It is also used in septic system drainage fields where a solid, well-draining layer is needed.

However, this product is not suitable for pathways or foot traffic areas due to its sharp, angular edges. It is also not recommended for decorative applications where color uniformity or a smooth surface is required. Trap Rock (1 1/2") should not be used as a fine aggregate or in applications requiring sand or gravel-sized particles. It is not appropriate for playground surfaces or areas where high permeability with small particle size is needed, such as sand filters.

Key Characteristics of Trap Rock (1 1/2")

• Hard, dense igneous rock (often basalt, diabase, or dolomite)
• Dark gray to black color, angular crushed shape
• Nominal particle size: 1 1/2 inches (actual range: 1" to 2")
• High resistance to abrasion and weathering
• Non-porous, low water absorption, chemically inert
• Bulk density: 150-170 lbs/ft³
• Free from organic and deleterious materials

Incorrect Applications and Limitations

• Not for decorative use where smoothness or color uniformity is needed
• Not for playgrounds, pedestrian paths, or foot traffic areas
• Not intended for use as sand, gravel, or fine aggregate
• May not be suitable for concrete if not meeting aggregate standards
• Not for high-permeability applications with small particle size

Technical Specifications and Performance

Trap Rock (1 1/2") typically meets or exceeds industry standards for durability and soundness. It passes sodium sulfate or magnesium sulfate soundness tests and has a low Los Angeles Abrasion value, indicating high durability. The angular shape ensures excellent compaction and interlock, which is critical for road bases, subbases, and structural fills. When used for drainage applications, Trap Rock allows for efficient water flow, reducing hydrostatic pressure and helping to prevent erosion and settlement.

For installation, it is important to remove organic materials and grade the area to create a stable base. Trap Rock should be installed in layers (typically 6 to 12 inches thick), with each layer compacted to maximize stability and prevent settlement. For driveways, parking lots, and heavy equipment pads, this approach ensures a solid, well-draining foundation.

Comparison with Other Aggregates

Ordering and Delivery with Gravelshop

Gravelshop supplies Trap Rock (1 1/2") to a wide range of locations across the United States. All prices shown include delivery, with no hidden fees. You can view pricing and delivery options by entering your ZIP code on our website. We offer easy online ordering and payment, and you will receive a confirmation email with all order details after checkout. Delivery is made by independent trucking companies, and the driver will unload the material at the most suitable location available, even if you are not present. Please ensure your delivery site is accessible for heavy trucks (minimum 12 feet wide). We do not spread or install the material; our service is supply only.

Our order process is simple: select your product, enter your ZIP code, add to cart, choose your delivery date and time, and pay securely online. We accept major credit cards and digital payment options. For volume estimates, use our online material calculator. Please allow for up to 5% size variation and fines in your order.

Sample Pricing for Trap Rock (1 1/2") Across the US

Prices for Trap Rock (1 1/2") vary by location due to local sourcing and delivery logistics. The table below provides a selection of current price examples, including both the cost per ton and the delivery fee for each city.

Summary Table: Technical Properties of Trap Rock (1 1/2")

Important Usage Notes

Trap Rock (1 1/2") is not intended for decorative landscaping, walkways, or foot traffic surfaces. Its angular, rough texture can cause discomfort and is not suitable for play areas or areas where a smooth finish is desired. Always confirm that Trap Rock meets the specific aggregate standards required for your project, especially for concrete or engineered fill. For questions about suitability, coverage, or delivery, consult Gravelshop's support team.

Order online for fast and reliable delivery. Prices include delivery, and our material calculator can help you estimate the quantity needed for your project. Gravelshop offers clear, upfront pricing and a straightforward ordering process for residential, commercial, and contractor needs.