Timber retaining wall drainage

Trapezoidal concrete gravity retaining wall which rotated

Timber Retaining Wall with Drainage - YouTub

We will teach you how to install a Timber Retaining wall and proper drainage to flow any unwanted water flow away Welcome to my channel. My name is Phil Sarros, owner of Sarros Landscaping in Cumming, GA. On this channel, I offer advice, guidance, training, and technical.. Elements of a Good Timber Retaining Wall. A quality-built timber wall will have these three elements: Efficient drainage to ensure the wood doesn't rot. A solid foundation — usually composed of gravel. A sufficient height to ensure that it accomplishes its practical purpose (to prevent soil erosion). 3 Things to Avoid When Building a Timber. Water is the major cause of retaining wall failures. Below is a stone wall that failed due to improper drainage behind the wall. The combination of the ground sloping toward the wall, no drainage stone behind the wall, and no clear weep holes or drainage outlets lead to this wall failure

Timbers are pretty 'leaky'. They don't typically seal together which allows water to pass through. This passage of water and the deadman will keep the wall from failing due to hydrostatic forces. However, with just wet soil on one side of the timb.. Ensure your retaining wall stands strong for years to come by using the correct type of stones for your project and by choosing a design that works well for your soil and lawn type. Our experts are happy to provide solutions for your retaining wall needs; just give us a call at 763-568-7251 or submit a message through our quick quote system Why Proper Drainage is Important for Retaining Wall Performance. A retaining wall is built to hold back a certain amount of soil. The design of a properly-built retaining wall resists the force of the soil behind it and prevents caving, buckling, or leaning. However, retaining walls are built with a certain capacity in mind This video shows how a Retaining wall should be back-filled to allow for maximum drainage. When we build a retaining wall we don't only hold back the soil w.. 4. Building Codes and Retaining Walls 5. Forces on Retaining Walls 6. Earthquake (Seismic) Design 7. Soil Bearing and Stability 8. Designing the Cantilever Wall Stem 9. Footing Design 10. Pier and Pile Foundations 11. Counterfort Retaining Walls 12. Cantilevered Tilt-Up Walls 13. Wood Retaining Walls 14. Gravity Walls 15. Gabion Walls 16.

Proper Timber Retaining Wall Drainage Sarros Landscaping

on Jan 07, 2020. It is important to consider retaining wall drainage in the process of building your wall. It can be vital in ensuring that the wall remains upright, and that too much wet earth doesn't cause it to buckle or even collapse. Poor drainage is often the cause of retaining walls failing, and then it is often too late to put right Phil talks about how to backfill a timber retaining wall using clean drainage stone and 4 inch perforated french drain tile sock pipe. If you are considering.. The 'How-to' of building Timber Retaining Walls. This Video shows how to finish your wall, with appropriate drainage to ensure a wall that will last To assemble the post, center the 2x4 in the middle of the first 2x6 and nail it with 3-in. galvanized nails, keeping the top ends flush. Nail the header onto the bottom of the vertical 2x6 (flush with the 2x4) with two 3-in. nails at two opposite corners. How to Build a Concrete Retaining Wall. Step 2 When the soil behind a retaining wall gets wet, it exerts much more pressure and weight against the wall. To relieve some of this pressure, your retaining wall needs proper drainage. Plan to backfill the wall with well-draining gravel or sand and install a drainage pipe

A retaining wall is intended to hold back soil when there is a drastic change in elevation. Often retaining walls are used to terrace yards that originally had a steep slope.Additionally, retaining walls can help create usable outdoor space as well as control erosion, (see Landscaping a Split-Level Home.)Low retaining walls are frequently used as planting beds and can add interest to an. A timber retaining wall can be a great feature for your backyard project. The steps for building a wall up to 2-ft tall are simple. Use UC4B pressure treated wood, install clean crushed aggregate on all surfaces that touch the wood, pin the bottom row of timbers, and coat all cut edges Drainage essential A build-up of water behind the wall is the principal cause of retaining wall failure. Good piped drainage that disposes of water away from behind the wall to limit this build-up of Figure 1: Surcharge and zone of influence. 1.5 m maximum surcharge 45° zone of influence Figure 2: Mass concrete or rubble gravity retaining wall Retaining wall drainage technology has improved over the years. These days, many people choose to build their retaining walls with a layer of sand packed up against the stones to create a buffer.

How to Build a Timber Retaining Wall (Step-by-Step Guide

How To Build A Wood Retaining Wall With Drainage. by Pupun Purnama October 4, 2020. Retaining wall ideas wood stone 2021 retaining wall concrete building a wood retaining wall that retaining walls how to build them. Retaining Wall Ideas Wood Stone Concrete This Old House Tip: For added stability, it is wise to insert a few timbers perpendicular to the wall. Called deadmen, the timbers extend from the retaining wall deep into the ground behind the wall. Drive 2' lengths of rebar through the ends of the deadmen and into the ground Retaining walls are generally made of steel reinforced concrete or concrete blockwork, timber sleepers and boulders. There are also certain practical maximum height requirements, depending on the type of material used to build the retaining wall. Timber sleepers - 1200mm (higher if larger vertical posts used) Concrete blockwork - 2000mm for. Feb 7, 2018 - Learn the basics of building a retaining wall—from common problems as well as the different types of materials to choose from, such as concrete, timber and stone timber retaining wall drainage very simply stacked by the house owner to maintain the backyard freed from any animal, they turn into a everlasting a part of each farm or ranch is shut sufficient to make use of it. Mining operations and shortly discovered a big rock, particularly in Europe and the UK, they're getting used to assemble buildings and even castles

How To Properly Add Drainage To Your Retaining Wall - DIY

Does a timber retaining wall need drainage? - Quor

Drainage Behind Retaining Wall: How to Stop Retaining

Timber walls are only moderately challenging to build by yourself up to 4 feet high Photo by Carolyn Bates How to Build a 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 Retaining Walls: Concrete vs. Wood Timbers. 2021-03-24. Retaining walls can play a critical role in landscape curb appeal, soil erosion, proper water drainage, and creating usable yard space by limiting or leveling vertical slopes in the landscape. Whether you are building new or replacing an existing retaining wall on your property two of the.

Retaining Wall Drainage: How to Drain Water Properly

Paint timber preservative on the top of the post once cut. Drainage. Lay 100mm of drainage scoria along the back of the wall. Place a filter sock over the over the drain coil to prevent it silting up. Lay the drain coil on top of the scoria and lead the ends to where they can discharge away from the wall Building a Timber Retaining Wall Good drainage and a stout connection to the hillside are keys to a long-lasting wall. By Scott McBride Issue 124. Synopsis: A generously illustrated guide to building a retaining wall from heavy wood timbers, including construction and drainage details that make a wall durable Walls The IBC allows walls less than 4 ft high to be exempt from engineering requirements, known as 'NED walls' (for non-engineered design). Cantilever wood walls are the most common type of NED wall, as seen at right construction of timber retaining walls in residential settings and shall not be used where design or construction exceeds any of the following limits or exclusions. Where there is any variation to the limitations stated in this Data Sheet including materials, soil conditions, drainage, surcharge (additional loads) or geometry of the retaining.

Timber Walls, Tall Walls, Building Codes and Other Stuff By themselves, landscape timbers and a railroad tie retaining wall lack the weight to hold back soil. To make these walls strong, you need to add dead men, anchors that lock the wall into the soil behind them A timber retaining wall is a cost effective option for flattening out your property. As we learned in this post, all wood in a timber retaining wall must be pressure treated to UC4A or UC4B standards (UC4B preferred). The timbers shall be 6″x6″ or 8″x8″. To further help with wood protection, we will ensure the [ Timber Retaining Walls. Timbers can be used for low to mid-rise retaining walls. It is the easiest of the retaining wall materials to work with. Wood retaining walls complement both contemporary and rustic looks. A timber retaining wall more than likely will require drainage to prevent the buildup of hydrostatic pressure. Block Retaining Walls. Backfill and drainage requirements shall be in accordance with . FIGURE 12 for timber retaining walls and FIGURE 13 for masonry and concrete retaining walls. Backfilling against masonry or concrete retaining walls shall not be permitted until at least seven days after placing concrete or grout. Heav Retaining walls are never cheap or easy but building one from timber railway sleepers is probably as cheap and easy as you are likely to find. As the sleepers are simply screwed together their construction is well within the abilities of most people without any specialist building experience. Install a drain behind the wall

How to Drain Retaining Walls. Water that's allowed to build up behind retaining walls can damage a wall or cause it to give way. Typically, drain lines are installed at the base of new walls. Often we install drainage solutions at the same time as we install a retaining wall. We ensure that water safely moves through your property and away from your home. Water is diverted to the street or to where it can safely be used within the yard or drained away, thus ensuring a successful hardscape installation

Backfill a Retaining wall - YouTub

The drainage stone will be installed at the back of the retaining wall and will extend 12-in behind the wall. Drainage stone allows for water to freely flow through to the drain pipe and out the face of the wall. For more on how drainage stone fits into a drainage system, check out this post A wall that leans into the soil it retains is less likely to be pushed outward by soil pressure than a plain-old vertical wall. Design and build your retaining wall to slope at a minimum rate of. Sep 2, 2018 - Explore Steve Medina's board Timber Retaining Walls on Pinterest. See more ideas about retaining wall, wood retaining wall, landscaping retaining walls timber (above ground), engineered wood products H4 Outside, in ground Fencing, pergolas, landscaping timbers, posts, green-houses, non structural retaining walls less than 1m high H5 Outside, in ground or fresh water Structural retaining walls, building po-les, house stumps, cooling tower infill, pilings in fresh water or critical applica-tions.

Mass Walls: Mass walls are only suitable for low walls as they rely on a mass of timber to resist the contained load. The wall is typically formed by sleepers spiked together in a staggered pattern. Timber Crib Walls: Crib walls are a common form of retaining wall, generally comprised of small pieces of treated hardwood placed in parallel rows and connected at regular intervals Nov 22, 2016 - Hi Jon, I have a driveway retaining wall that continues to be pushed by the ground, even though it is backed by gravel and drained to nothing under the driveway except crushed gravel. I realize proper drainage affects this somewhat, however would prefer not to cut open my driveway, sidewalk and dig all the way up to the French drain Timber Retaining Wall. When referring to a retaining wall built of timbers, this consists of 6″x6″ or 8″x8″ lumber stacked on top of each other. The bottom timber is secured by driving steel rebar through the timber and into the ground. Each subsequent timber is tied to the one below with long skews, nails or spikes

Retaining Wall Drainage Mistakes to Avoid DoItYourself

  1. Building a retaining wall takes proper planning in order to avoid it collapsing. We will look at some factors that need to be considered early in the design phase along with the best type of retaining wall and drainage materials for your project. The purpose of a retaining wall is to hold soil behind it
  2. 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. Average DIY Cost. $10/sqft. Average Pro Cost
  3. Drainage behind retaining wall how to building a timber retaining wall how building a timber retaining wall how a retaining wall without weep holes. How To Build A Retaining Wall By. How To Build A Stone Retaining Wall. Drainage Behind Retaining Wall How To Stop Walls From Failing Kg Landscape Management
  4. Landscape fabric is thin and sturdy and is a simple way to preserve a retaining wall's construction. Dig a 6- to 8-inch wide trench immediately behind the retaining wall with a shovel
  5. imum rating of H4. We've gone for treated pine sleepers, which are designed to go in ground, and will last longer out in the weather and soil..
  6. How to build a Sleeper Retaining Wall. First there a few different designs of timber walls and depending on the height and the theme you want to go with the rest of your landscape then your choice will differ as to which one to build. Timber walls can be split up into two main types, closed faced or open faced

How to backfill a timber retaining wall - YouTub

  1. Dec 9, 2019 - Explore Steve Medina's board Pressure Treated Timber Retaining Wall on Pinterest. See more ideas about retaining wall, wood retaining wall, landscaping retaining walls
  2. Effective drainage is vital for a retaining wall, otherwise water pressure known as hydrostatic pressure will build up behind the wall and lead to bulging or cracking. Ways to achieve good drainage include using at least 300mm of a granular material such as gravel in the backfill (the material directly behind the wall)
  3. Yet retaining walls that use masonry retaining wall blocks or those made from thick timbers can be difficult to build because of the overly heavy materials. As long as the height of the retained soil stays fairly low, you can build another type of wood retaining wall that uses lighter weight dimensional pressure-treated lumber

The retaining wall described here is less than 1.5m in height with post spacing set at 1.2m, and does not support any surcharge or load additional to that of the ground. ortant workk. PPM0029_RETAINING_WALL.indd 1M0029_RETAINING_WALL.indd 1 99/2/09 3:16:46 PM/2/09 3:16:46 P These retaining walls are built from large hollow concrete blocks, steel reinforcing bars and concrete core filled. A Besser block wall construction is structurally strong and long lasting. Backfill and Adept's drainage system are important components of constructing Besser block walls - see Adept's Drainage. Timber retaining walls other retaining wall. In these cases, the applicable code for the purposes of the Integrated Planning Act is the Building Code of Australia (refer to BCA Vol 2 Part 3.1.1). 2. Retaining walls not more than 1m in height may be constructed in accordance with an accepted industry standard publication (e.g.; timber, concrete masonry or similar) Many retaining walls built in Northern Virginia were constructed by contractors who did not get the necessary permits or did not understand how a wood retaining wall system needs to be built. One of the ways that we can restore a wood retaining wall, is to excavate behind the wall and install the necessary drainage system that keeps a wall from. Another option is to go with a block wall. Retainer block walls are typically staggered backwards as it goes up. You then line the back side with drainable material (river rock) and a drain tile to allow any water building up a route of escape. However you're pushing the limits of most consumer-size retaining wall blocks at 4'

Good Drainage Behind and/or Through the Wall. When soil or clay on a slope is waterlogged, it is practically unstoppable. Like jelly while it's still liquid, you need a bowl to contain it, but after it's set, it supports itself. So one of the main tasks required of a retaining wall is to drain water out of the bank behind We are a landscape design/build company that strives to go above & beyond your expectations. We can install & maintain your landscape. From planting perennial beds to building engineered retaining walls, we want you to choose Timber Creek Landscape. We offer a full 7 year warranty on all hardscape installations (concrete pavers & retaining walls) Timber Retaining Walls. Retaining walls are perfect for creating a focal point in your garden, highlighting a special feature or levelling off areas to create a flat lawn. Retaining walls are great for creating terracing and raised gardens where space is limited. On a steep site they give your garden structure, highlight natural features and. Subsoil drainage design systems and how to build a retaining wall fast building a timber retaining wall how diy retaining wall ideas ture Drainage Behind Retaining Wall How To Stop Walls From Failing Kg Landscape ManagementHow To Build A Timber Retaining Wall Bunnings WarehouseRetaining Walls Advanced Drainage SolutionsRetaining Walls Sca ConstructionSubsoil Drainage Design Systems An Retaining Wall Basics Landscaping Work. Build A Retaining Wall Australian Handyman. Retaining Wall Drainage Bbc Gardeners World. Retaining Wall Ideas Wood Stone Concrete This Old House. Wooden Retaining Wall Advice Needed Doityourself Munity Forums. Replacing Old Wood Retaining Walls Cornerstone Wall Solutions

A typical drainage detail for a gravity wall (in particular, an MSE wall) is shown in Exhibit 730-11. Include drainage details with a wall unless otherwise recommended to be deleted by the Region Materials Engineer or HQ Geotechnical Office. 730.04(5) Aesthetics Retaining walls and slopes can have a pleasing appearance that is compatible with th As stated before, retaining wall failures are primarily due to poor drainage. A good retaining wall begins with landscape fabric, gravel backfill, and 4-inch perforated drainpipe. Digging. Timber walls should be built on a trench filled with about 6 to 8 inches of compacted gravel so that the top of the first timber is even with the grade of. If your slope needs a higher wall or requires extensive grading, call in a masonry or landscape contractor -- or terrace the slope with two or more lower retaining walls. Getting Ready: In addition to the usual carpentry and digging tools, you will want a baby sledge for hammering the 12-inch spikes In a brick and mortar retaining wall, the bricks are secured together with a layer of mortar, which looks like a light gray concrete. This mortar is typically one of the first things to show wear on a well-made wall. To fix the mortar, Carefully chisel out mortar to a point of a little over 1/2 the depth of the brick. Replace the mortar A timber retaining wall is a great landscaping design element that is both functional and attractive. Retaining walls can be used for several different applications from a simple flower bed to leveling off parts of a yard that has sudden drops. While there are many different types of materials you can use from rocks, to cement, to strong 4x6.

Timber Retaining Walls - Finishing - YouTub

A good wood retaining wall sits on a solid footing of compressed gravel, and it has sufficient drainage behind it to protect the wood from moisture deterioration. The timbers are pinned to one another and to the ground, usually with steel reinforcement bar, or rebar, or landscape screws Crib walls are made up of interlocking individual boxes made from timber or pre-cast concrete. The boxes are then filled with crushed stone or other coarse granular materials to create a free-draining structure. There are two basic types of crib wall: - Timber, and - Reinforced pre-cast concrete These retaining walls are installed to lean towards the soil and counteract the effects of gravity. The purpose of these boulder walls help manage drainage control and stop the continuous erosion of property. The wall's construction offers level surfaces for owners to have more space than the original yard. Boulder retaining walls are. The timber style, which is the most common, gets most of its strength from 6x6s set perpendicular to the face of the wall. A crossed 6×6 at the rear adds additional support. As with other types of walls, set the timbers on a gravel base and provide good drainage behind the wall. Fasten the timbers with long spikes or screws

The basic parts of a mortared-stone wall. Components can vary for other types of retaining walls. Drainage stone: Keeps water from collecting behind the wall Filter fabric: Prevents soil from clogging drainage stone Batter: The backward lean into the earth, about 1 inch for every 1 foot of wall height Weep hole: Spaced every 6 to 8 feet, it lets water drain through the wall bas Figure 1 - Typical Retaining Wall Construction Retaining Walls (up to 1 m high) Timber retaining walls up to one metre high can be constructed as shown in Figure 1. Member sizes and post embedment depths shall be as outlined in Tables 1 and 2 for preservative treated softwood and hardwood, respectively. Walls exceeding 400 mm high should have a.

A wood retaining wall is a nice addition to your property to create a terraced area. The problem is over time maintenance is needed due to wood rot. First thing you need to do is inventory on what needs to be replaced and what is connected to that element of the timber retaining wall Timber retaining walls generally do not have weep holes because the layering of the wood to construct the wall allows for natural weepage between the layers. However I woud be concerned if the area behind the wall remains excessively wet....that would lead me to believe that this was not designed with adequate backfill for proper drainage Retaining walls are built for a variety of purposes including slope management, drainage and erosion control, and aesthetic reasons.A retaining wall can help define a flowerbed or can be incorporated with a drainage system to prevent erosion and control water flow on slopes. Retaining walls can be constructed out of a variety of materials including concrete, natural stones, timber, or blocks

Bennett Landscape, IncRetaining Walls Wellington

Wood Retaining Wall Drainage Detail. by Pupun Purnama March 26, 2021. Steel and wood retaining wall hometalk lines for retaining walls 4 0 in how to build a timber retaining wall retaining walls in and around. Retaining Wall Drainage How To Drain Water Properly Pool Research half in the ground half out ie. 600mm high wall will require 600mm of post to be cemented into the ground) * Add 100mm to the depth of each hole for 20mm drainage gravel. Place 100mm of 20mm drainage gravel in the bottom of each hole, the timber post will sit directly on this gravel which will ensure water drains away from the timber post

Indeed, concrete is one of the most tough and durable materials for a retaining wall. However, it is additionally one of the most costly retaining wall ideas. In particular, poured concrete is the most costly choice, and it can cost around $30 to $40 per square foot. In the event that you want the vibe of concrete, you can save money by picking. Cut posts to height when all boards are attached and seal with timber preserver on top. Install drainage scoria rocks at the base of the retaining wall along the back before laying a drain coil along the wall, then top up with scoria rock and cover with topsoil. Seal or paint your timber retaining wall if desired The guys at Retaining Walls Charlotte fixed our drainage issues by installing a great looking concrete wall. I am confident enough to say that these are pros pros. We provide property owners with effective and gorgeous retaining walls made of wood, timber and railroad ties. This is by far the cheapest retaining wall option Good retaining wall construction includes an efficient drainage system, but it is best to let runoff after a heavy rain flow over the top of the wall rather than seep behind it. As for procuring materials, estimating the amount of material needed for a retaining wall can be tricky Timber Retaining Wall. Timber Retaining Walls are a great alternative to modular block with a reduced price tag. At Georgia Hardscapes our Timber Retaining Walls are built to last the longevity of the timber it is built with (10-15 years). Timber Walls are great for preventing or correcting drainage issues on non-load bearing parts of your yard

J Paint timber preservative on the top of the post once cut. J where they can discharge away from the wall. Ensure the drain coil has some 'fall' - slopes down the length of the wall to allow water to run out. J If possible, have the drain coil accessible at both ends so it can JCover the drain coil with 250mm of drainage scoria Timber Retaining Walls. This is a closer view of the completed pressure treated timber wall behind the pool. This wall is used for erosion control and expansion of this yard. Intimate Spaces turns unusable area into functional and beautiful spaces. Over 380 landscape timbers were used on this project A rock retaining wall offer efficient erosion control, have great drainage, are durable, and can be used in a variety of retaining applications including garden beds or feature walls. Please get in touch with us today by either filling in the enquiry form, or by calling Christian directly

Ads. Wood retaining wall ideas are always impressive with the great visual appeal and the sense of harmony in the landscape project. Such walls are an affordable and relatively simple way to reinforce slopes. In general, retaining walls are one of the most practical and beautiful elements of landscape design If you want to move the earth, build a retaining wall—by the time you're done, you'll feel as though you've moved half the planet. Because a retaining wall is going to be in contact with the ground, make sure you use lumber that's rated for ground contact. Your best choice is a pressure-treated wood that has a rating of .40 or higher Should include drain pipe with appropriate gravel bed, etc. Property sits near bottom of hill with negative slope towards house. Function of retaining wall is to control erosion onto property. A small area avg 6ft X 20ft of eroded slope will need to be leveled in front of the added retaining wall Summary of Retaining Walls Made of TImber or Wood. A wood or lumber retaining wall is an efficient way of managing a sloped space in your backyard to use the area while offering some character to the landscape. Wood retaining walls are generally developed with pressure-treated wood, and they'll last 40 years or more when managed and.

This type of wall has tremendous character built into it with the wide railroad ties, discoloration, gouges, and even history. Once the ground is prepared, the process of building a railroad tie retaining wall is very straightforward. It is labor-intensive, though, and does take a lot of time On a short wall probably all you need is gaps between the block, but for taller walls a drain tile system is probably going to be required. If wood is used, drainage is more important, because the wood tends to be tighter, with fewer natural gaps for drainage, and because you want to keep it as dry as possible Retaining Wall Repairs. We construct our timber walls with six-foot by six-foot, precisely-cut timbers arranged in a sturdy dead-men formation to ensure that our timber retaining walls are as strong as possible. By placing timbers at 90 degree angles (the dead-men way) our timber walls are built to provide maximum strength and. Timber retaining walls should lean into the slope of land an inch or more for each foot of pressure treated wood applied. We use 6×6 boards so they being between 1/2 inch to 3/4. Each board stepping up from the last. It is important to pay attention to the water issues, the water left to pool behind the wall speeds up the rot of the wood

A retaining wall holds soil in place and is built of modest materials, such as concrete or timber, but it's a project that shouldn't be taken lightly. Building a retaining wall isn't a project. Drainage gravels are generally used to facilitate the movement of water around your property or more to the point, away from it altogether! The most common usage is behind retaining walls or sub-surface drainage trenches running underneath lawns and gardens Wood vs Block Retaining Wall . Wood and concrete block are two of the most common materials. Both can give you an attractive wall that can help facilitate drainage and stop erosion. But these are two very different materials that will look and function in different ways. Wood walls cannot stack higher than 4-feet, as they generally can't be. This retaining wall retains little soil and not subject to the forces of higher walls, however, a drainage system is still advisable to take seepage away and to avoid any possible waterlogging. Position old sheets of cardboard, hardboard or gibboard (or some other material that will disintegrate) down the back, about 100mm (4″) behind the.

Timber retaining wall home in timber retaining walls auckland subsoil drainage design systems and how to get council ering unique retaining crib wall systemHow To The main factors that affect the price of a DIY retaining wall are the materials used, transportation for those materials, and equipment rental or purchase. The materials cost is usually by far the highest: Timber: $10-$25 per square foot. Natural stone: $8-$25 per square foot. Stone veneer: $11-$15 per square foot Special requirements, such as drainage. Timber retaining wall cost will also vary depending on the type of wood you use. Average prices for materials and labour are: $250 to $350 per square metre for treated timber (pine) $300 to $450 per square metre for treated timber sleepers (hardwood EXPOL StyroDrain (protection & drainage) is a permeable light-weight drainage material manufactured from 100% recycled Expanded Polystyrene material, offering drainage and protection to the water-proofing membrane used on retaining walls. A double layer of EXPOL StyroDrain may be required if the retaining wall is higher than 1.8 metres or in special circumstances

Why Retaining Walls Fail | Garrett ChurchillHere’s How: Install a retaining wall - Lifestyle - TheDIY Superstore - Installing a Retaining Wall - YouTubeHow to Build a Timber Retaining Wall - This Old House