Table of Contents
What kind of wood should I use for a retaining wall?
The best kind of lumber for these walls is Douglas fir pressure treated with preservatives to discourage rot. It will be green or brown in color and rated for earth-to-wood contact. For timber walls, large timbers for can be very expensive, which is why railroad ties are a common alternative.
What is the cheapest way to make a retaining wall?
The cheapest types of retaining walls are wood and concrete blocks, followed by concrete and stones or bricks. Each material has benefits and drawbacks, including strength, longevity, and attractiveness. For those who are planning on building their own retaining wall, it is vital to plan and research.
How tall can a wood retaining wall be?
Your walls can be as long as you want, but limit the height to 4 ft. Add more terraces as needed to retain higher slopes, stepping them back about 4 ft.
Are wood retaining walls good?
Wood can be a budget friendly solution for a DIY retaining wall. However, wood is subject to fungal rot, termites, and water damage. When following all of the best recommendations, a wood retaining wall can last up to 40 years. Without proper techniques, a wood retaining wall can fail in as soon as 5 years.
How long will a wood retaining wall last?
A timber retaining wall can last a little over a decade, if treated properly. If not maintained, the lifespan of a timber wall is around 3 to 5 years. To keep its fresh look, timber requires serious maintenance. The material will hold up for so many years only if its pressure-treated with chemicals.
Does a 2 foot retaining wall need drainage?
These walls need a drainage system regardless of the wall height. If there are poor draining soils such as clay behind the wall, there needs to be drainage incorporated the wall system. Clay when wet is very weak, so it is essential to provide a way for water to escape from behind the wall.
How far apart should posts be for a retaining wall?
Retaining wall posts should be at least three feet apart. The distance can be slightly longer or shorter if it works better with your measurements. However, you shouldn’t go more than seven feet apart to make sure your wall is sturdy enough.
How many deadmans are needed for a retaining wall?
Install one dead man every 6 to 8 feet around the entire wall. Continue building up the retaining wall, using landscaping screws to secure each timber. Cover the ground in front of the retaining wall with 2 to 4 inches of bark mulch.
How much does a wood retaining wall cost?
The average cost to install a timber retaining wall is about $10 per square foot or $1000 for DIY installation of a 20′ long x 5′ high wall (100 sf). If hiring a Pro, the same retaining wall cost is about $2,800 or $28 per square foot.
How do you build a pressure treated wooden retaining wall?
Materials. (4) two-by-six pressure-treated lumber boards, each 8 feet long. Prepare the Retaining Wall Area. Mark the Other Post Locations. Dig the Post Holes. Add the Gravel to the Holes. Pour the Concrete. Add Gravel Under the Wall Location. Install the Boards.
How do you protect wood from the ground?
The ideal way to protect the wood from rotting in the ground is to apply wood preservatives free of arsenic and chromium. An example of this preservative is the water-borne copper naphthenate. Then, brush it on the wood before putting it in the ground: whether pressure-treated or not.
How do you keep untreated wood from rotting?
Even though natural weather-resistant wood is the best choice for outdoor exposure, at some point it becomes vulnerable to decay. The only way to properly use untreated wood of any type outside is with the addition of water-repellent preservatives, sealer or paint that contain UV protection.
How do you stop sleepers from rotting in the ground?
Wood Preserver Wood preservative treatments provide garden sleepers with protective properties that help prevent rot, mould and fungal growth, as well as help to form a defence against the elements. It is best to apply a wood preservative before installation of your sleeper, so that you can paint all sides.
How do you stop a retaining wall from rotting?
You have to keep the wood coated with quality oils, protecting spray, paint, waxes and varnishes. Paint will keep fungus away from attacking your wooden property. You have to install a retaining wall moisture barrier. Any area of your wooden property that is exposed to moisture is likely to rot.
How deep should the footing be for a retaining wall?
The general rule of thumb is to bury about one-eighth of the height of the wall. For example, if your wall will be three feet (36 inches) tall, the first course of blocks should start five inches below soil level. The gravel base should start three inches below this.
WHY DO retaining walls fail?
There are many causes of a failing retaining wall: Lack of site investigation: Soil compression, backfill materials, water tables, landslides and building codes restricting soil bearing capacity should all be thoroughly investigated to reduce the probability of retaining wall failure.
How do you build a retaining wall on a sloped yard?
To build a retaining wall on a slope, follow these steps: Dig a stepped trench. Gravel base. Install the first row of blocks. Rough gravel. Install remaining block layers. Secure top row blocks. Backfill.
