Quick Answer: How To Build A Boulder Retaining Wall?

Do boulder retaining walls need drainage?

The stones must fit together well, like a jigsaw puzzle, with the majority of the weight on the stone below, not the soil behind it. 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.

Are boulder retaining walls expensive?

Installing boulder walls is fairly simple compared to segmental concrete retaining walls because each 3-foot to 4-foot boulder can be set with equipment, while blocks have to be stacked by hand. For this reason, the cost of boulder retaining walls can range from $25 per face foot to $55 per face foot.

How much does it cost to build a boulder wall?

The national average cost for a retaining wall is around $25 – $50 per square foot. Here’s how to calculate the cost for your retaining wall project.



Types of Materials Used for Retaining Walls and The Cost.

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Retaining Wall Material Type Estimated Cost Per Square Foot
Boulder/Rock $11 per sq. ft.

Why do boulder retaining walls fail?

The strength of a boulder retaining wall and its overall holding capacity comes from the sheer weight of the boulders being used. Small stones simply can’t hold back big banks. The second misapplication when building a boulder retaining wall is using a large boulder, but using it in the wrong way.

What is the cheapest type of retaining wall?

What is the cheapest retaining wall material?

  • Treated pine and is the least expensive material.
  • Hardwood is more expensive than treated pine.
  • Railway sleepers are another – slightly more expensive – option and are built to withstand ground and water contact.
  • Concrete sleepers are more expensive.

Does a 2 foot retaining wall need drainage?

Although there are exceptions, most retaining walls require gravel backfill, soil compaction, pipe or toe drains, and weep holes. Together, these four features will provide adequate drainage for most designs. Only a few types of walls will not require all of them.

Should you use landscape fabric behind retaining wall?

Whether the wall is made from stones, bricks or wood, it is important to provide a barrier between the building blocks and the soil. Landscape fabric is thin and sturdy and is a simple way to preserve a retaining wall’s construction.

What type of retaining wall is best?

Timber and inter-locking-concrete-block walls are great DIY retaining wall ideas. Mortared masonry and poured concrete ones are usually best left to a mason.

How long will a railroad tie retaining wall last?

Cons: Limited life span (10 to 20 years) because timbers rot and are damaged by pests. Cannot be used to create curving walls as can concrete and stone.

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How much does a 6 foot retaining wall cost?

The average cost of building a retaining wall is $5,636. Most homeowners find themselves spending between $3,229 and $8,670. The cost of retaining wall materials ranges from $3 to $40 per square foot. Wall block prices fall between $10 and $15 per square foot, while precase, poured concrete runs $20 to $25.

How much does a 4 foot retaining wall cost?

Retaining Wall Cost per Square Foot

Size Average cost
25 x 3-feet (75 sq.ft.) $3,750
25 x 4feet (100 sq.ft.) $5,000
40 x 4feet (160 sq.ft.) $8,000
60 x 4feet (240 sq.ft.) $12,000

How do I calculate how much retaining wall I need?

Multiply the length of the wall (in feet) by the height of wall (also in feet) to get the square footage of the outside face of the wall. Then, multiply 1.12. This allows for having 12% of the wall’s height under the surface of the ground to give the wall more stability.

Can I build my own retaining wall?

Retaining walls can be made from wood, bricks, natural stones or concrete blocks. For DIYers, it’s best to use concrete retaining wall blocks, which can be interlocking and are heavy enough to stay in place without cement or other adhesive. Interlocking blocks fit together and add extra security to the wall.

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