Lava Rock from Fire Pit Essentials Our fire rock is heat proof and is ideal for use in indoor and outdoor gas fire pits and fireplaces. Lava rock comes in red or black colors, can be shaped like rounded pebbles or angular stones, and is available in small and large sizes. Fire Pit Use Lava rock is often used in outdoor fire pits, fire bowls and fire tables. It can be used exclusively or as a cost-effective base layer underneath fire glass. Fireplace Use Replace the faux logs in your indoor or outdoor gas fireplace with lava rock for a clean, attractive ambience. Or, simply fill the area around and under your existing logs with lava rock or fire glass. Decorative Use Lava rock can be used in landscaping, around potted plants or succulents, or as interior décor. Fill vases, make centerpieces or use lava rock in crafting. Calculator for Circular or Rounded Fire Pits or Fire Bowls How much lava rock will you need? To calculate the amount of lava rock needed to fill a circular fire pit, use the following equation: Diameter X Diameter X Depth, divided by 24 = pounds of lava rock needed. We recommend a minimum 2" of lava rock depth for most installations. For example, a 25" diameter fire pit at the recommended 2" of lava rock depth: 25 X 25 X 2, divided by 24 = 52 lbs. Calculator for Square or Rectangle Fire Pit How much lava rock will you need? To calculate the amount of fire pit lava rock needed to fill a square or rectangular fire pit, use the following equation: Width X Length X Depth, divided by 19 = pounds of lava rock needed. We recommend a minimum 2" of lava rock depth for most installations. For example, a 20" X 25" fire pit at the recommended 2" of fire lava rock: 20 X 25 X 2, divided by 19 = 52 lbs.
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