- Boulders are very heavy.
- For example a 12″ rock weighs about 100 lbs a 18″ rock weighs about 300 lbs and a 24″ rock weighs about 700 lbs.

Thus, How many tons of boulder do I need for a retaining wall? 20 feet by 2 feet by 2 feet = 80 cubic feet. Divide the total cubic feet by 15 to determine the amount of stone needed in tons: 80 cubic feet / 15 = 5.334 tons of stone.

Additionally How much does a 1000 pound boulder cost? 20/lb A 1000 lb boulder $200.00.

What is the average size of a boulder? In geology, a boulder (or rarely bowlder) is a rock fragment with size greater than 25.6 centimetres (10.1 in) in diameter. Smaller pieces are called cobbles and pebbles. While a boulder may be small enough to move or roll manually, others are extremely massive.

How heavy is the average boulder? A one-foot boulder can probably weigh 80 to 100 pounds, a two-foot boulder could be 300 to 450, a three-foot boulder can weigh anywhere from 1,200 all the way up to 1,800 depending on length, width, and height.

**Do boulder retaining walls need drainage?**

Due to the weight and shape of the rocks, no mortar is required when constructing a sturdy wall. A major advantage of boulder retaining walls is that they offer natural drainage. When residential retaining walls fail, it is most often due to poor drainage.

**How long do boulder retaining walls last?**

A well-constructed boulder retaining wall should last 30+ years as natural rock will last for years and years in the elements. The rain and freezing cycles will affect the shape of the boulder retaining wall. Done right, the wall can last well beyond 30 years.

**How high can a boulder retaining wall be?**

Larger well-placed boulders can look natural, simple and attractive. Walls up to about 21⁄2′ high can be constructed using the 8″ to 12″. Higher walls should use larger rocks because of the need for additional structural support or consider a design using 2 levels or terracing with the smaller rocks.

**How big is a ton of rock?**

Assuming an average weight of 165 pounds per cubic foot, a 1 ton rock has a volume of 12.1 cubic feet, a diameter of 2.85 feet, and a circumference of 9 feet. Why are rocks so heavy?

**How many sq ft are in a ton?**

1 ton equals 12,000 BTU. That means that, on average, we will need 0.0016 tons per square foot.

…

Tonnage Table.

Area (Square Feet): | BTU | Tonnage |
---|---|---|

600 sq ft | 12,000 BTU | 1 Ton |

900 sq ft | 18,000 BTU | 1.5 Tons |

1,200 sq ft | 24,000 BTU | 2 Tons |

1,500 sq ft | 30,000 BTU | 2.5 Tons |

**How do you calculate rock coverage?**

To calculate the size, measure the length and the width of your project area. Multiply those two numbers to come up with the square footage of your coverage area. So if your project is 18 feet long by 20 feet wide, your coverage area is 360 square feet. Next decide how deep you want your coverage.

**How many tons of rock are in a dump truck?**

Typically, larger dump trucks can carry about 28,000 pounds or about 14 tons. On average, smaller dump trucks can transport around 13,000 to 15,000 pounds or 6.5 to 7.5 tons.

**What’s the difference between a rock and a boulder?**

The difference between a rock and a boulder can be explained in terms of size and detachment. A rock is defined by geologists as an aggregate of minerals. A boulder is a type of rock, specifically a large detached one. All boulders are rocks, but not all rocks are boulders.

**What size is a 1 ton rock?**

Assuming an average weight of 165 pounds per cubic foot, a 1 ton rock has a volume of 12.1 cubic feet, a diameter of 2.85 feet, and a circumference of 9 feet.

**How much does a 2 foot round boulder weigh?**

Average Boulder Weights by Size A one-foot boulder can probably weigh 80 to 100 pounds, a two-foot boulder could be 300 to 450, a three-foot boulder can weigh anywhere from 1,200 all the way up to 1,800 depending on length, width, and height.

**Where do big boulders come from?**

Over 75,000 years ago, the Laurentide Continental Glacier covered most of Canada and some of the northern regions of the United States. When this glacier started to recede 20,000 years ago, rainwater and melted ice began seeping into the porous bedrock. The water would freeze and expand, causing the rocks to crack.