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Monday, October 24, 2022

DIY Retaining walls, part one.

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Talking about retaining walls, most retaining walls these days are made of Besser-blocks. The walls are made with hollow concrete blocks 190 X 190 X 390 laid with mortar 10mm thick joints, steel reinforcement bars are placed in the hollow part of the blocks, then they are filled with concrete, once the walles are dry enough. 

Welcome to our article,  DIY Retaining walls, Part one of three. 

Dear readers, in our previous articles, we have talked about how to build houses, now, let us talk about retaining walls. There are several reasons why people want to build retaining walls. If  you own a standalone house, you may want to improve your property by doing a few things in the yard, so, you can stay outside and have a garden, or have a barbecue with your family and friends. But there are times when it is not easy to stay outside, because the yard is not level and, in some places, it is hard even to stand up straight, so, something needs to be done to improve the situation. In this case retaining walls can help solve that problem. But how do we build retaining walls one may ask? 

LET US START BY LOOKING AT THIS STONE RETAINING WALL BELOW. 


There are many types of retaining walls, this above is a masonry stone wall, these types of stone walls last for a very long time, when they are built well, like the one above, but they cost a lot more than other types of retaining walls. 

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Anyhow, let us see what we can learn from this stone wall picture above, just by looking at it and trying to imagine how this wall has been built. What we can note from the picture is that the retaining wall has been built leaning towards the bank it is holding up, we can see this at the right end of the wall where the wall goes around the corner,  the stones are laid dry as there is no sign of any mortar around, the stones are not all the same size, and they are longer and shorter stones, but they are all the same thickness and they are laid the same way as we lay a course of bricks, but at the same time the mason has made sure that the vertical join are not setting one above the other, and this is a hard thing to do with stones all different size, everything is so tidy, the wall thickness is not shown anywhere, but because there is a very low wall started near, it seems that the wall has been built like a double brick wall, we can also guess that perhaps some of the short stones are not really short, but they have been laid like a header brick to tie the front with the back of the wall, at the top the last course of stone, the stones are longer and as wide as the whole wall itself, so that they would tie everything together. These are the main features that we can learn from looking at this stonewall picture.

Now that we have explained that, let us write how to do it yourself retaining walls. You know, there are many types of retaining walls, some are easy to build others are hard to build, and there are many reasons for building them. So, this article is going to be a long article, because we want to tell you about them, as much as we can.   

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How to build retaining walls. 

Okay, there are several ways how to build a retaining wall, and there are several types of retaining walls that we can build. Therefore, first we must see what we gain by building this type of retaining wall, or that type of retaining wall, and above all how much it could cost, before we can decide what type of retaining wall to build. Now we want to build our retaining walls with building materials that are easily available, to avoid extra cost. So, look what local materials are available, where you are. You see, if you are in a place where stones or rocks are plentiful, and you may even have some of them in your yard, then it is cheaper to build your retaining wall with these materials, and even if you have to buy the lot they are cheap anyhow; but if you are in a place where there are plenty of trees and there is even a sawmill nearby, then it is more appropriate to build it with timber.    

Having said that, it is obvious that for you to decide, what is the best retaining wall to build; we need to explain to you what could be done and how can it be done. Therefore, hereunder we will try to do that. Let us start with a very easy and cheap retaining wall that most people can do themselves, even if they don’t know much about building, as long as they have a few tools and know how to use them; here we are saying that anyone of us can dig a few holes in the ground to place a few short posts and place a couple of sleeper timber planks against those posts, then secure them by nailing or screwing them to the posts. It sounds and is simple, isn’t it? But this is not the only retaining wall that we want to show you, so, keep reading this article, while we add more descriptions, because you can even learn how to build them.  

Timber sleeper retaining walls. 

Building a low timber sleeper retaining wall is easy, just about everybody can do it, you can do it yourself, if you follow our explanation in this text here, all you need is a crowbar, a post hole shovel, a hammer a few long nails or screws, a saw, a type measure and a few treated pine sleepers that today are easily available at most timber yards.

If you are in Brisbane Australia, these are a couple of addresses of local timber merchants and hardware to get what you want. If you are somewhere else, you need to find your own.  

 http://en.wikipedia.org/wiki/Bunnings_Warehouse

Now, let us assume that you have visited your local supply, and you have got all you need, so, you are ready to start, you have also worked out where you want your sleeper wall to go; So, start digging the first hole where the wall starts, you need to dig this hole about 600 mm or more in the natural ground for the post to be strong enough to hold the pressure of the retaining wall when the wall is back filled; you may have to concrete around the post for extra strength, but this is not a must do, if the retaining wall is low, because you can replace this with, packing the soil tightly around the posts and if you have some rocks, wedge them between the top of the hole you have dug and the post at ground level, because the rocks will exercise their pressure on a larger surface of the natural soil than the post, they will be able to hold back the soil pressure of the wall more easily, now that you have done the first post, you can repeat the same procedure for next post and so on.

The posts can be made from the same material of the sleepers; you can saw them to the right length and fix them in the ground as we have said above. Now, to make it easy let us say that your wall is going to be the length of a sleeper plank, and you have dug the two holes and fixed the two posts. So, now you can just place the first sleeper against the posts at the required level; the levels of the sleepers is better if you work it out from the top down, because it is easier to change the bottom than the top, you see, in this case you can always dig a bit or add a bit of soil at the bottom to fit the bottom sleeper. So, mark on the posts the level you want to reach with your last sleeper, and then mark down from this level the number of sleepers you are fixing on these posts, once you have done that you are ready to fix your sleepers on the posts.

Fixing your sleeper to the post. 

To fix the sleepers to the post now is simple, but still you need to do a few things right, if you want your wall to last a long time, with the materials you are using now; it is useful to know that in this case it is highly advisable that you use galvanized nails or screws to fix the planks to the posts, because the retaining wall is in contact with the wet or humid ground constantly, therefore, normal nails or screws will rust easily.

You have bought some 75 mm and 100 mm galvanized nails to do the job, so, you hope that you can drive these nails into the sleepers and posts just by using a hammer, because it is the fastest way to get the job done. 

Okay, if you are good with your hammer and can drive nail easily it is the best way to go, provided that the timber is soft enough to do that, and if you have used treated pine sleeper it can be done, as all you need to do now is to place the sleepers where you have marked on the posts and nail them in, and then you can backfill behind the retaining wall and the job is done.

But what about if you are using hardwood or old dry hardwood, because you got it very cheap from a second hand timber yard, because they were overstocked they sold this timber at a very special price, which was less than half the price of the treated pine sleepers; so, you were happy to buy it because it was cheap and the timber being hardwood lasts for a very long time, but now you may have a problem to fix the sleepers to the posts, because it is near impossible to drive nails into this old dry hardwood timber, unless you drill a hole for every single nail, and even then the nails can bend even if you are an expert with the hammer.

If this is the situation and it is hard to nail this timber together, you can overcome the problem by using couch screws or bolts, so, you use a drill and drill a hole for your galvanized couch screws or bolts and tighten the screws or the bolt nuts with a spanner. But if you don’t want to do this extra work and you want to use the galvanized nails that you have already bought, then you can do the following: drill a hole as deep as you can just use a bit a fraction smaller than the diameter of your nails, then try first with the 75 mm nails how you go, if it works and you believe that the nail go deep enough into the supporting post and hold well then your problem is solved, but if the nail bends or don’t go deep enough then you can try the following, and this is one of the last tricks of the old trade, which not many people know or use, this trick is not a trick at all and once you know it, you can feel even stupid for not thinking about it yourself; so what is it? Okay, when you pick up your nail to nail in the hole you have drilled, dip the point of the nail a couple of centimetres into a bit of Vaseline or mechanical grease, if this is not available just wet a bar of soap and rub the point of the nail on the wet soap, this greasing of the end of the nail will make it easier to drive it into any wood including dry old hardwood.

I believe that I have said enough about simple timber retaining walls, for you to have some idea how to build them, so, now let us talk about another type of retaining wall that can be easy to build, it is a type of concrete wall that the blocks are laid dry, so, anyone can have a go; and if you don't get it right the first time it is easy to fix.

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There is a lot more that we can say, but this blog is becoming too long, so, see you in part two. 

To see more, or the entire article click on this link, DIY Retaining walls

World views diary November 2024

WELCOME TO OUR BLOG YOU ARE INVITED, TO BROWSE AS LONG AS YOU LIKE. Anyhow, here I will publish my own diary and what I see happening in the...