Hello and welcome this is Carl the Landscape
Guy. There are so many different types of natural
stones from which you can build decorative walls. Shaping the stones is a lot of hard work and
softer stones like sandstone is easier to shape and form. You will find some detailed sandstone videos
on my channel. But what about brittle and hard rocks? During shaping, they can break or split easily. Vangjeli thinks you can use any kind of stone
for a wall. Today’s video is about a 2.5 m high and stable
retaining wall made of greywacke stones. In particularly, today is about the stability
of retaining walls and the process of corner building. We are working with a really hard greywacke
stone. You can already tell that the wall will look
very good with nice light-dark contrasts. This is a retaining wall that holds very well
and is stable. Without any extra concrete support behind
the wall it holds up well by using a bunch of half meter long rocks that tie in deep
into the wall. This way you can easily build walls that are
three to four meters tall. The problem with this type of stone is that
it’s difficult to work with. Because these are brittle stones and when
you try to make a nice front or want to take away a corner they dont break where you hit
it. They can break wherever they feel like it. They already have tiny cracks that aren’t
visible. Especially making a nice corner stone is really
hard. Nico is here working on one and it could easily
break apart any second. Then you can just start all over and have
also lost the time you worked on it. And for this reason, you want to pre-sort
the stones in the quarry. It is very worthwhile when you take a small
excavator and 2 workers to pick the right stones. That way we can pick and prepare about 50m2
of wall per day. Then we load them onto a truck and bring them
to the construction where we build the wall. The good thing is we only have stones at the
construction site that are really usable and not many waste stones. Otherwise we are talking about 30% rocks and
gravel that are not usable. Here we can use it as backfill material but
that doesnt work on every job. Because here we have a retaining wall that
needs to be backfilled. If we have a 2 faced cladding wall we don’t
have any space to put the waste material. Then picking it back up and getting rid of
it takes time and money. Therefore it is better if we pick the stones
ourselves. That way it is also easier to plan because
we would go and say ok we need 100 cornerstones, then we can take our excavator with the grabber
attachment and pack the stones we need. With the time we lose there in the quarry
we can do at least two more square meters of wall per day. Here we have a nice big stone. It has a nice face here, but of course we
can not put it this way. You can put it like that but definitely not
in the retaining wall. I have already prepared a face on that side
and we can set it in the wall now. We will put it in so that it ties deep into
the wall. That combined with the mortar will make the
wall very strong and retains 150 tons on the other side no problem. It is also important how we pack the stones
in the back. The stones should also be packed properly
here and not just thrown in like that. We close the gaps at least 80% with mortar. The stones must definitely be laying like
that. We do not need any mortar in this drainage
area. Up to here is the mortar and behind it is
the drainage area without mortar. 40 cm of mortared wall and the rest doesn’t
need mortar behind it, so that water can run down later. For each vertical square meter of wall you
need at least three big rocks with this length that tie in deeper. The deeper the better. If the wall is 3 to 4 m high, we have to start
at the bottom with the biggest stones. Of course, this is only possible with appropriate
wall thickness or like here in a retaining wall. If the wall comes to such a height then you
have to use big stones. Because such a stone can not be walled like
this, that’s not possible. In no case, even if it’s twice as wide i wouldn’t
put it that way. I will put it in like this. Some mortar with it and in this way. Then we take the waste rocks and gravel. Here it is good that we have it because you
can fill the gaps nicely with mortar. And then you can let the stones swim like
that. Now we set this inside cornerstone. Now you might think why this way? Well because half of it will disappear later. That has to go like that because otherwise
we can not make a proper vertical grout in the corner. We don’t want the two wall parts to move apart. Not every layer has to be that way but we
do like every third one. Also keep in mind that it should not be too
cold or too wet when building your wall. We stop building when it gets colder than
-3 ° Celsius. Then we cover the wall up with fabric over
night. But when it rains, the problem is that the
stones are wet and the greywacke stones won’t draw water. The mortar doesn’t thicken up by itself and
since the rocks don’t draw any water the grout can flush out and it will look bad. Because it is raining we will have to wash
the wall next day. To make such a corner you can not use thick
layers of mortar. Especially with this weather. The stones must sit on each other even without
mortar. The mortar does not hold the stones it only
fills the gaps. Otherwise you will have to wait before putting
the next row of stones on top. Because the mortar will squeeze out. You see that here, the stones sit on each
other even without mortar. If you put the stones swimming on mortar of
course you can not make the next row on it. We always have to make sure we can continue
to work all day. Not two rows and go home. There are people who say I just put more mortar
under the stones and it will be fine. Then you can put one more row on it maybe
but the second and third row on top won’t stand. Then your joints squeeze out and your wall
opens up and falls apart. Thanks for watching, it was very windy today
and I apologize for the sound disturbances. If you would like to see more about our natural
stone works and tipps, I put together this playlist for you, so make sure to check it
out. Good luck with your projects and see you next
time. Im Carl the landscape guy.

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Reader Comments

  1. doriantomas

    hei carl. nice work. heavy stones… ooof…
    how deep was the foundation? how was build? stones or concrete? what kind of rebars did you use? if any…
    what kind of drainage pipe did you put behind the wall? if any…

  2. Te Tumu Shooter

    Thank you for downloading Very informative At present using hard rock myself I use a cut off grinder to score a too long rock Then a wide chisel to part it

  3. G S

    This can look simple to the untrained eye. These guys are artists. Very awesome work fellers. My back aches just watching now that I am old.

  4. Luke De Col

    If it was built without mortar it would last alot longer… all the mortar does is stop any water passing through. But each to their own.

  5. Livingstone Wangolo

    Good work. Only that my fear is, the wall may fall due to poor drainage. I wish you had put in drainage pipes. To drain water behind the wall when it rains.

  6. ellie brooker

    Really nice trade/job to have. I love doing stonework . Satisfying and an old art. We have some lovely granite in devon,big random shapes n colours. We also got to work on some lovely heritage buildings and gorgeous houses. Keep up the good work just watch out if using lime..glove time

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