Question: What Is The Best Base For A Retaining Wall?

How deep should the footing be for a retaining wall?

two feetConcrete retaining wall footing size The depth to the bottom of the base slab should be kept at a minimum of two feet.

However, it should always be below the seasonal frost line, and that often is much deeper in northern climates..

How close can a retaining wall be to a house foundation?

No, retaining walls cannot exceed 4 feet (48″) in height within the front yard setback.

How high can you build a retaining wall without council approval?

1 metreLegislation on the construction of retaining walls is set by your local council. The ‘magic number’of 1 metre is commonly referred to as the maximum height you can build to without a permit.

What is the cheapest retaining wall to build?

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.More items…•

How long do retaining walls last?

between 50 and 100 yearsFor a permanent wall structure, the general lifespan is generally between 50 and 100 years. This does, however, depend on the conditions of the soil and groundwater at your site.

What can I use instead of a retaining wall?

Reinforced Soil Slopes. Reinforced soil slopes are a quick and easy construction style that uses a geotextile, such as polyethylene or polypropylene, to lock existing soil into place to create a reinforced mass. … Natural Stone Walls. … Wooden Timbers. … Gabion Walls. … Soil Bioengineered Walls.

What do you use to backfill a retaining wall?

Backfill refers to the dirt behind the wall. In order to provide proper drainage, at least 12 inches of granular backfill (gravel or a similar aggregate) should be installed directly behind the wall. Compacted native soil can be used to backfill the rest of the space behind the wall.

How thick should a retaining wall base be?

The depth of the trench should be equal to the height of the block plus compacted base depth (Table 1). Example: For an exposed wall height of 1’6″ and using a 6″ high block, dig the trench a total of 9 inches in depth.

At what height does a retaining wall need to be engineered?

* In New South Wales, you need permission from council to build a retaining wall higher than 600mm from ground level. * On the Gold Coast of Queensland, you need building approval for retaining walls 1 metre or more in height. * In Victoria, a building permit is needed for retaining walls over 1 metre high.

What kind of rock do you put behind a retaining wall?

Backfill After each row is completed, you should use backfill to reinforce the retaining wall. Crushed gravel is used to fill in the back and sides of your blocks. This is done upon completion of each row. Backfill helps with water drainage.

Can you use sand as a base for a retaining wall?

To keep the blocks on your retaining wall level and structurally sound, you need a base layer of several inches of well compacted, sharp gravel. … Be sure to use coarse builder’s sand, and tamp it down firmly to keep the sand from shifting and settling after the wall is built.

How do you prepare the ground for a retaining wall?

prepare base for retaining wall Excavate the entire area to a depth of 8”. Spread approximately 4” of gravel evenly in the trench and rake the gravel smooth. Use a hand or power tamper to compact and level the area. Check for level and add or remove gravel as necessary until the appropriate height is reached.

What is the easiest retaining wall to build?

For the average do-it-yourselfer, building a retaining wall is easiest when using masonry blocks that will be stacked no taller than three feet, with no mortar binding the stones or concrete members. (For a curved wall, mark instead with a garden hose or spray paint.) …

Do I need to put landscape fabric behind retaining wall?

Poor drainage resulting in saturated soil and frost heaving is the main cause of failure. That’s why all strong retaining walls begin with landscape fabric, backfill, and 4-inch perforated drainpipe.