**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..**

Table of Contents

## How do I calculate the thickness of a retaining wall?

Base width = 1/2 to 1/3 of the height of the wall. **Base thickness = 1/8 of the height of the wall but not less than 12 inches**. Stem thickness = 6 inches + ¼ inch for each foot of wall height.

### How thick should a 1m retaining wall be?

If your retaining wall is holding back a 1m depth of garden then it needs to be 225mm thick.

### How do I calculate the number of retaining wall blocks?

To find the total number of blocks needed for the wall, multiply the number of columns by the number of rows; don’t forget to subtract a row if using cap blocks.

### What is the legal height for a boundary wall?

The laws actually state that a fence can be as high as 100 meters. However, this is only allowed if proper planning permits have been obtained. This means that any fence under 2 meters in height does not require a permit. This simple law has a few complications to it.

## What is the difference between a retaining wall and a boundary wall?

There is some obvious confusion between garden and retaining walls because in many cases a retaining wall is used to create land space for a garden. But the difference is substantial as garden walls are used to define a boundary while retaining walls are designed to hold back soil.

### Is uphill neighbor responsible for retaining wall Qld?

Retaining walls are built to support built up or excavated earth. They are normally not a matter of joint responsibility for neighbours as they are usually benefit one neighbour more than the other.

### How deep should a footing be for a block wall?

Normally a foundation wall with seven rows of blocks will be 24 inches wide and 12 inches deep and should have a footing 30 inches below grade. Remember to build a leveled footing where the cinder block will be placed.

Can you build a retaining wall on a slope? If your property is on a slope, you’ll build flatter spots that are more usable for different needs. Boulders, pavers, bricks, concrete blocks, and even wood can help you to build an effective retaining wall on a slope. If you plan to DIY this project, here are the steps to take to have a successful experience.

## How do you calculate retaining wall stones?

Use This Simple Formula

Use this equation to figure out how much stone you need to build a stone wall: **(length in feet x width in feet x height in feet) / 27 = cubic yards of stone needed**.

### How high can I build a wall without planning permission?

Erecting a new fence, wall or gate will not require need planning permission if: it would be below 1 metre high and next to a road used by vehicles (or the footpath of such a road) or below 2 metres high elsewhere.

### How close to the boundary can I build a retaining wall?

There must be a minimum distance of 900mm from each boundary, the wall must be at minimum of 1m from a registered easement or sewer/water main.

### How much weight can a retaining wall hold?

Even small retaining walls have to contain enormous loads. A 4-foot-high, 15-foot-long wall could be holding back as much as 20 tons of saturated soil. Double the wall height to 8 feet, and you would need a wall that’s eight times stronger to do the same job.

### How do you build a 4 foot high retaining wall?

Why do retaining wall blocks have a Lip? A lip on the back of each block creates a uniform setback as each course is added. This design causes the wall to angle slightly back into the slope, further improving its holding power.

How many bricks do I need for a circle calculator?

- Place the scale drawing of the circle flat on a table.
- Draw a perfect square around the circle.
- Calculate the area of the square, and divide that by the surface area of the facing-out side of a brick.
- Have someone else duplicate your work.
- Place the scale drawing of the circle flat on a table.

How many Pavestones make a circle? Using a ready to install DIY fire pit patio kit with instructions works better. A circular fire pit measuring 37inches in diameter takes 12 pavers of 12 inches for each ring.

## How deep do you dig for a retaining wall?

The trench should be deep enough to bury at least half the height of your first course of blocks as they sit on a 2- to 3-inch base of gravel. Depending on the size of your blocks, this depth will be about **4 to 6 inches**. The trench should be twice as wide as a single block.

### How many retaining wall blocks do I need to make a circle?

Step 1: Place 14 Blocks in Circle

You could use a string and two pencils to mark out a more perfect circle, but I found it easiest to just lay the blocks in the best circle I could. Then, use a shovel or a stick to mark the outer and inner edges of the blocks.

### How do you calculate landscape blocks?

To calculate the number of landscape blocks needed for the retaining wall, figure out the length of the landscape blocks in feet. For example, if you are using 6-inch blocks, the blocks are 6/12 or 0.5 feet. Now, divide the perimeter by the length of the landscape block in feet.

### What is the maximum height of a retaining wall?

Most retaining walls, whether load-bearing or not, average between 3 and 4 feet in height. As a general rule, you do not want to build any sort of structure over 4 feet in height without including some type of structural support within.

## How close can I build to my Neighbours boundary?

As a rule of thumb, a build that reaches 7.2 feet is considered acceptable and anything over that we do recommend speaking to your neighbour.

### Do retaining walls need building regulations?

Independent, freestanding retaining walls may not require building regulation approval; however, any structures must be structurally sound and well maintained.

### Can my Neighbour knock down a boundary wall?

If it has been built on your neighbour’s land, don’t panic. If the wall has been in the same place for more than 20 years without legal challenge, you have probably taken ownership of the land on which the wall is built, the land up to the wall as well). In that case, your neighbour can’t knock it down.

Can you build a retaining wall against a fence? You can build a retaining wall against a fence. This is done in some cases where a fence is already present. If there is soil pushing up against this fence, it can benefit the fence to protect its retaining wall. The retaining wall helps stop soil from adding pressure to your fence or spilling out into your yard.

## How do you build a retaining wall on a sloped yard?

Steps to Follow When Building a Retaining Wall on a Slope

- Step #1: Get the Trench Compact and Level.
- Step #2: Install the Wall Rock.
- Step #3: Excavate the Second Level.
- Step #4: Place the Base Course of Blocks.
- Step #5: Compact the Wall Rock Behind the Blocks.
- Step #6: Fill in the Step Up Areas.

What is the size of a retaining wall block? Basic 12-in L x 4-in H x 8-in D Concrete Retaining Wall Block in the Retaining Wall Block department at Lowes.com.

How tall can you build a retaining wall with blocks? The interlocking retaining wall block can be stacked to build walls up to 24 to 36 inches high, depending on the size of the block.

How big of a footing do I need for a retaining wall? The footing dimensions will largely be determined by the size of the wall. A poured concrete footing for concrete, block or brick walls should be at least twice as wide as the planned wall. The footing should be at least as thick vertically as the wall’s planned width.