1B Limestone (1/4 - 1/2")

1B Limestone (1/4 - 1/2"): Technical Overview and Practical Applications

1B Limestone, also known as #1B Limestone, 1/4" x 1/2" Limestone, Clean Limestone Chips, or 1B Clean Stone, is a crushed, angular limestone aggregate. The particle size ranges from approximately 1/4 inch to 1/2 inch (6-12 mm). This material is washed to remove dust and fines, resulting in a clean, free-draining product. Its color is typically light gray to off-white. 1B Limestone is durable, hard, and chemically stable in most environments. It is usually produced to meet ASTM C33 or similar aggregate specifications, with a bulk density of about 1.3 to 1.5 tons per cubic yard. This product is sold by weight (ton) or by volume (cubic yard).

Physical Characteristics and Material Standards

The uniform gradation of 1B Limestone ensures that the majority of particles fall within the specified size range. This aggregate is non-reactive and maintains its structure under normal environmental conditions. It is free-draining, meaning it does not compact tightly and allows water to pass through easily. The stone is hard, with a Mohs hardness of approximately 3. It is typically produced from high-calcium limestone and is screened and washed to ensure minimal fines or clay content.

Typical Applications of 1B Limestone

• Drainage backfill for French drains and pipe bedding
• Underlayment for permeable paver systems
• Landscaping mulch or ground cover
• Erosion control installations
• Concrete aggregate in select mixes
• Septic system drain fields
• Light-duty railroad ballast
• Decorative walkways and paths
• Animal stall flooring for improved drainage
• Base material for playgrounds (with proper design)

The free-draining nature of 1B Limestone makes it ideal where water management is crucial. Its angular shape helps lock particles in place for stability, yet it does not compact enough for structural base layers.

Limitations and Unsuitable Uses

• Not suitable for applications requiring compaction, such as road bases or structural fill
• Not recommended for driveways or parking areas, as the material will shift and migrate
• Not intended for use as a surface course in high-traffic areas
• Not appropriate where a fine-graded or smooth finish is required
• Should not be used in concrete mixes that require specific gradation or strength unless specified
• Not for use in high-acidity environments, as limestone may degrade

For projects needing a compacted base or surface, alternative materials such as 2B Limestone or gravel may be more suitable.

Material Comparison Table

Specifications and Performance Table

Ordering, Delivery, and Pricing Information

Gravelshop supplies 1B Limestone in bulk, with delivery included in the listed price. Orders can be placed online by selecting your product and entering your delivery ZIP code to see local pricing. Delivery is available across 31 states, and you can choose your delivery date and time slot during checkout. The price you see includes all fees and delivery costs, with no hidden charges. You will receive a confirmation email with payment and shipping details after ordering. Please note, road access must be at least 12 feet wide for delivery. The driver will decide the most suitable unloading spot if you are not present. Gravelshop does not offer material spreading or landscaping services.

Below are sample prices for 1B Limestone delivered to selected locations across the United States. Prices may vary by region and are subject to change.

To view the total price for your location, enter your ZIP code on the Gravelshop website. All prices include delivery and sales tax. Minimum order quantities may apply and vary by region.

Summary of Key Points for Buyers

1B Limestone is a clean, washed, angular aggregate with a size range of 1/4 to 1/2 inch. It is best suited for drainage, bedding, and decorative applications where compaction is not required. Not recommended for driveways, structural bases, or high-traffic surfaces. Orders with Gravelshop include delivery, and you can schedule your preferred delivery window. For all orders, ensure your site is accessible for heavy trucks and note that Gravelshop does not spread or install materials.

For further assistance, coverage calculators, or to check the minimum order for your area, please visit the Gravelshop website or contact customer support.