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Black Lava Rock – 1"-1½" (40lbs Bag)
Hargrove Hearth Products

Black Lava Rock – 1"-1½" (40lbs Bag)

SKU: BLR
Sale price$47.00

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Product Overview

By Hargrove Hearth Products

The classic choice for gas fire pits, Black Lava Rock delivers reliable performance and natural texture. Each 1"–1½" volcanic stone is fire-rated and lightweight—perfect as a base media or standalone filler for gas burners.

Its porous design helps distribute heat evenly while promoting airflow between components. Use under fireglass, log sets, or other media for improved burner function and a natural, rustic look.

Product Features
  • All-Natural Volcanic Rock – Heat-treated for gas fire feature safety
  • Porous Texture – Enhances airflow and heat dispersion
  • Lightweight and Long-Lasting – Easy to handle and won’t degrade
  • Use Alone or as a Base Layer – Compatible with log sets and fireglass
  • Low-Maintenance and Cost-Effective
  • Safe for Indoor & Outdoor Vented Gas Fire Features
Product Specifications
Rock Size 1" – 1½"
Bag Weight 40 lbs
Coverage Approx. 2.5–3 sq ft at 2" depth
Recommended Use Base layer for Warming Trends®, Blaze, and OGC burners
Fire bowls, tables, and custom enclosures
For use in outdoor vented gas fire features only
Coverage Guide
Table Size Lava Rock Needed
40” Square 32 lbs
48” Square 63 lbs
56” Square 104 lbs
48” x 30” Rectangular 23 lbs
60” x 34” Rectangular 45 lbs
72” x 38” Rectangular 75 lbs

We recommend rounding up slightly to account for uneven terrain and airflow between burner parts.

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Price Match Promise

If you find the same item for less from an authorized retailer at the time of purchase, we’ll match the price. Just send us the details — we’ll make it right.

Curated for Quality

We thoughtfully select every item in our store based on quality materials, trusted manufacturing, and outdoor durability standards — so you can shop with confidence.

Free Shipping

All orders ship free within the continental United States—no minimums and no additional shipping charges.

Customer Service

Our dedicated team is here to support you every step of the way. From product selection to post-purchase help, we’re proud to offer friendly, reliable service you can count on.

Product Overview

By Hargrove Hearth Products

The classic choice for gas fire pits, Black Lava Rock delivers reliable performance and natural texture. Each 1"–1½" volcanic stone is fire-rated and lightweight—perfect as a base media or standalone filler for gas burners.

Its porous design helps distribute heat evenly while promoting airflow between components. Use under fireglass, log sets, or other media for improved burner function and a natural, rustic look.

Product Features
  • All-Natural Volcanic Rock – Heat-treated for gas fire feature safety
  • Porous Texture – Enhances airflow and heat dispersion
  • Lightweight and Long-Lasting – Easy to handle and won’t degrade
  • Use Alone or as a Base Layer – Compatible with log sets and fireglass
  • Low-Maintenance and Cost-Effective
  • Safe for Indoor & Outdoor Vented Gas Fire Features
Product Specifications
Rock Size 1" – 1½"
Bag Weight 40 lbs
Coverage Approx. 2.5–3 sq ft at 2" depth
Recommended Use Base layer for Warming Trends®, Blaze, and OGC burners
Fire bowls, tables, and custom enclosures
For use in outdoor vented gas fire features only
Coverage Guide
Table Size Lava Rock Needed
40” Square 32 lbs
48” Square 63 lbs
56” Square 104 lbs
48” x 30” Rectangular 23 lbs
60” x 34” Rectangular 45 lbs
72” x 38” Rectangular 75 lbs

We recommend rounding up slightly to account for uneven terrain and airflow between burner parts.