How thick does a concrete retaining wall need to be?
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.
What is the easiest retaining wall to build?
While retaining walls of this type are relatively inexpensive, they can be difficult to repair or remove. 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.
Does a 2 foot retaining wall need drainage?
Second, a retaining wall must have properly compacted backfill. … 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.
Do I need a footing for a retaining wall?
Foundation. … A buried structural footing is usually required for larger retaining walls. To create this, a landscaper pours concrete below frost level (the depth to which the ground will freeze during the winter).
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.
How deep should a concrete footing be for a retaining wall?
A concrete footing should be 100mm deep by 300mm wide if the footing is for a free standing wall. The footing should be increased to 150mm deep and 450mm wide if the wall being built is a retaining wall. For larger retaining walls an engineer may need to be approached for advice.
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.
What do you put under retaining wall?
The base material should only consist of angular, sharp edged particles such as ¾ minus gravel. The various sized crushed gravel with the fines helps ensures for appropriate compaction. Round rocks such as pea gravel rolls and dislodge under pressure resulting in failure of the retaining wall.
What can I use instead of a retaining wall?
An alternative to retaining walls are typically metal mesh gabion baskets filled with stones. These present different options for introducing creative elements to your garden and landscaping. Garden walls with stone embankment – plantable. This is a great combination of design and functionality.
Do I need drainage behind short retaining wall?
For proper drainage, the first 12 inches of space behind a retaining wall should be filled with crushed stone or gravel. This is so that when water gets into the space, it does not become bogged down in soil but instead can flow down the wall to the drains or weep holes.
WHY DO Retaining walls fail?
The reasons for these types of failures are lack of proper reinforcement, improper drainage behind the wall (lack of weep holes or clogged holes), foundation footing problems, settlement or expansion of the soil, overloading of the wall, construction errors, and/or other design errors.