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How To Build A Retaining Wall With Wood

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Michael Isaac

How To Build A Retaining Wall With Wood

Want to stop soil erosion or level out spaces like driveways, gardens or patios? A wood retaining wall might be the answer. It’s a great way to change the shape of slopes on your land and even though this job looks on the larger side, it’s actually not that hard or expensive to to get done by a professional. 

Unlike concrete blocks, wood walls are kinder to the pocket. But they require a lot of work to put up. An electric drill is essential in the construction process for making holes, driving spikes, and connecting boards.

Things to Note About Building a Retaining Wall With Wood

  • Start by choosing the right wood for your wall. Go for pressure-treated pine or fir. These are good choices for a wall that sits on the ground. 
  • Remember, don’t go higher than 30 inches, or it will collapse under pressure. 
  • Secure it well with strong posts. Make sure to dig deep holes for them. This will make your wall firm like a wooden fence.
  • To make your wall strong, nail boards to the posts facing the slope. A wood wall lasts about 10 years but with proper care it can last up to 20 years. 
  • Putting the facing board on the slope side helps. It keeps the wall solid against the pressure from the land.
  • Putting time and effort into your retaining wall pays off. You’ll get a nice and useful part of your yard. It stops soil erosion and gives you level areas for everything.

How to Build a Wood Retaining Wall 

Before you start building a wood retaining wall, planning is important. First, choose the right location. Accurately laying out the wall location after excavation is a must for the stability and overall quality of the wall. 

Consider the height and length you need. Also, know your area’s building laws and get the necessary permits.

Where to Build Your Retaining Wall

Look for areas with steep slopes that are eroding. These areas need a strong retaining wall to hold back the soil. Signs of soil erosion are dead plants, changes in your garden, more bugs and muddy water. Exposed roots are another sign of soil erosion.

 Avoid areas where water collects as it will damage the wall. Choose an area where the soil you dig out is the same as what you need to put back to minimise extra work.

How Tall and Long Do You Need Your Wall?

Measurements are important. The first course must be perfectly in place and level to ensure the stability of the entire structure. 

Wall HeightCouncil Approval Required
Less than 1mNo
1m to 1.5mYes, if less than 1.5m from a neighbouring building
Over 1.5mYes, and engineering consultation recommended

Note: These regulations and guidelines change from one state to another. Always check with your local council before constructing a retaining wall.

Check Local Building Codes and Get the Right Permits

Make sure to check local building codes and get the right permits. Most places need council approval for walls over 1m high and close to a neighbour. These rules vary so check yours. For walls over 1m it’s smart to talk to an engineer. Also, consider hiring a professional landscaper (like us) or big projects. We can make sure everything is done right.

Get Your Materials and Tools for Your Wood Retaining Wall

Before you start, get all your materials and tools. This step is important for a hassle-free build. It will save you trouble later on.

Choosing the Right Pressure-Treated Lumber

For the wall, choose pressure-treated pine or fir for ground use. Ensure the timber is rated for ground contact to guarantee durability and stability. 

This will ensure it can all withstand weather and decay, keeping your wall strong. Go for posts at least 75mm thick for stability. But for walls over 1m, talk to an engineer about thicker posts.

How Much Timber, Gravel and Other Materials Do You Need?

Need posts? The general rule is to put half in the ground, half out. For a 600mm high wall, use 1.2m posts. Space them 3 feet (0.91 m) apart. For a 40 feet (12 m) wall you’d use 14 posts.

Go for 50mm or 75mm thick hardwood or treated pine for your rails. They should be 2.4m long. Divide your wall’s length by 2.4 to find out how many rails you need. Don’t forget galvanised bolts, 20mm drainage gravel, geofabric, agg pipe and concrete mix or rapid set.

Tools Required for Building a Wooden Retaining Wall

The right tools are a must. For your wall you’ll need:

  • Safety gear
  • Circular saw or hand saw
  • Tape measure
  • Spirit level
  • Power drill
  • Electric drill
  • Shovel and digging spade
  • Crow bar
  • String line
  • Wheelbarrow
  • Concrete mixer
  • Spanners or socket set
Things to Note About Building a Retaining Wall With Wood

Step by Step: How to Build a Wooden Retaining Wall

A wood retaining wall can change the look of your yard and make it level for use. With the right tools and a little knowledge, this is doable. Here’s a step-by-step guide on how to install a timber retaining wall.

Prepare the Site and Lay the Foundation

Clear the area and remove rocks and debris. Level the ground with a rake. Accurately laying out the wall location is crucial for its stability and overall quality. Mark where your posts will go with chalk, 3 feet apart. For a solid base, dig a trench and holes as needed, fill with concrete, and let it dry.

Install Posts and Anchor the Wall

Next, install your posts and anchor the wall. Posts should be 2 to 3 feet apart. For a 40-foot wall, you’ll need around 14 posts. Secure the posts well so they are straight and stable. Use an electric drill to drive spikes and connect boards to ensure a sturdy construction. This will make your wall look good and strong.

Install Horizontal Boards and Backfill

After the posts, install the boards. Use bolts to attach 2×6 boards between the posts. Line up the boards with the posts. Put nails or screws as spacers. Ensure the first course is perfectly in place and level, as this is crucial for the stability of the wall.

Now, fill the soil behind the boards as you go. This backfill should be as high as your post holes are deep.

Drainage for Your Wood Retaining Wall

Drainage is key when building a wood retaining wall. Proper water drainage is essential to prevent hydrostatic pressure buildup, which can lead to wall failure. Without it, your wall will crack, collapse, or be damaged by water. This is because of the pressure of water that’s not drained well. Including drainage in your wall design will make it last longer and stay strong.

Why Drainage is Important in Retaining Wall Construction

Drainage is crucial for timber retaining walls. Water buildup can push against the wall and make it fail. This is due to hydrostatic pressure. This is more important for walls over 1 meter high which an engineer may need to check especially in certain soil types. Proper drainage stops water damage, keeps soil from getting too wet, improves the wall’s strength and stops erosion.

How to Include Proper Drainage in Your Design

To keep your retaining wall drained well use gravel for backfill not just soil. Soaked soil is heavy and can cause wall collapse. Here’s how to include drainage in your design:

  1. Use geo fabric to stop water from going through the wall.
  2. Put an agg pipe at the base of the wall, 75mm from the wall. It should drain to a safe place like a gutter or pit.
  3. Fill around the agg pipe with 20mm drainage gravel. Calculate how much you need based on your wall’s measurements.
  4. Also, cover the gravel with geo fabric to keep soil out.

Drainage for timber retaining walls includes French drains, weep holes, fabric, pipes and surface drainage. The process involves digging, using geotextile, adding gravel or rock, installing the drainage components and backfilling.

Using these drainage methods in your design will control water pressure. This will prevent damage and keep your landscaping project stable for a long time.

How to Maintain and Extend the Life of Your Wood Retaining Wall

You must take care of your timber retaining wall to make it last long. Regular maintenance is a must. A well-built wood wall can last over 10 years if it’s of good quality and treated right.

Pressure-treated wood is good for the outer parts, but it’s best to use copper preservative on any cuts. Additionally, using a wood preservative to seal cut ends of timber will prevent decay and preserve the quality of the wood used in the retaining wall construction, especially if you’re looking to create a smaller one. This will stop decay and make your wall last longer.

Adding plants or grass to the wall will help too. They will keep the soil in place so the wall stays strong.

Also, check the wall often. Look for loose parts, cracks or if the soil is eroding. Fixing small problems early will save your wall from bigger damage.

Key Takeaways

  • Wood retaining walls are cheap and effective to stop soil erosion and level out spaces.
  • Pressure treated pine and fir for ground use are the best wood for these walls.
  • Don’t go higher than 30 inches or it will collapse under pressure.
  • Use four-by-four posts as anchors and dig deep holes for them to support the wall.
  • With good wood and care it will last 20 years.

FAQ

What type of wood should I use for a retaining wall?

Pressure treated pine and fir are the best woods for a wood retaining wall. They are meant to touch the ground. These woods can handle moisture and decay, perfect for outdoor use.

How high can I build my wood retaining wall?

Your wood retaining wall should not be higher than 30 inches (76 cm). Walls higher than this will fall due to water pressure. For higher walls ask an engineer for design and build assistance.

How do I tie my wooden retaining wall?

For anchoring a wood retaining wall use four-by-four posts like a fence. Dig these posts into the ground and attach boards to them. This will add strength and stability to the wall.

How long will my wood retaining wall last?

Wood retaining walls last 10 years. But good quality wood that’s treated can last 20 years. Don’t forget to take care and fix on time to make it last longer.

How do I ensure drainage for my wooden retaining wall?

Good drainage will stop water from damaging or toppling your wall. Use gravel not soil for the backfill and add an agg pipe at the base of the wall. Cover the back with geo fabric to keep the drainage clear.

Do I need council approval to build a wood retaining wall?

For walls over 1m but under 1.5m near another building you usually need council’s okay. Rules can vary so always check with your local council first. If council or an engineer must be involved, it’s best to hire a pro for a correct and compliant build.

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