Build your own carport – secure slope with shuttering blocks

The slope behind the carport had to be secured. For one thing, the earth would otherwise permanently slide into the carport, and for another, the slope just looked visually modest. My goal was to intercept the slope with a wall of shuttering stones and create a kind of raised bed behind it.

Prepare foundation for the formwork wall

After I had prepared the excavation pit for the new carport, the trench for the later foundation of the concrete formwork wall was then dug, also with a mini-excavator. With a shovel width of 40cm and a depth of 100cm, there was of course quite a bit of excavation again.

Nevertheless, enough space remained to deliver the frost protection for the foundation by truck. Frost protection was placed in the trench and compacted with a “frog”.

Now the trench could be measured to have a uniform height of the foundation later. Using a level, a mason’s string was stretched at the correct height across both sides of what would become the wall.

From this cord could later measure the desired distance to the foundation.

The concrete was delivered the following day and placed according to specifications by a contractor. This was one of the few jobs that was done by external companies. I lacked the necessary tools and especially the time for this work.

The filled concrete was to cure for another 4 weeks before I had time and material for the next stage. This consisted of placing the formwork blocks and then pouring concrete.

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The 1st row of stones is set

The wall required a total of 100 50x25x25 formwork blocks and 3 pallets of ready-mix concrete. Again on a Saturday morning it went, together with my father to the work.

First, the first row was set in earth-moist concrete and aligned in alignment and height with the help of a straightedge.The first row should be worked particularly meticulously. This saves a lot of time in the following rows because there the stones only have to be put on.

This was followed by the installation of reinforcing bars in the vertical. These steel bars are to further increase the connection of the formwork wall to the foundation.

For this purpose, holes of a good 30cm depth were drilled in the foundation at the appropriate positions and the reinforcing bars inserted.

Video: Build retaining wall on the slope

In the following video I have documented the individual construction stages for building the retaining wall on the slope.

You can find my videos about building the carport in my playlist Project Carport – Building a Carport on a Slope by Yourself. If you want to see more of me and my projects, feel free to check out my YouTube channel.

Fill shuttering blocks with concrete

After the reinforcement was placed, I already filled the concrete – which was produced using an old but extremely robust GDR concrete mixer – into the formwork blocks.

The effort required for this was relatively large. First, I had to pour the bags of ready-mix concrete into a wheelbarrow because they wouldn’t fit in the concrete mixer. Then the concrete was mixed with water to form a viscous mass.

From the concrete mixer, the viscous concrete was then poured into a second wheelbarrow.

I then used a hand shovel to pour the concrete from the wheelbarrow into the openings in the formwork blocks. The viscous mass was then stirred in the formwork block with a metal rod so that the concrete really spread to all corners.

Shuttering blocks from the 2nd to the 4th row are set

With an offset of half a brick, the second row of switch bricks was then set, followed – again with an offset – by the third row. The concrete was poured simultaneously from the wheelbarrow with a shovel.

Since the first row was set accurately in alignment and balance in the concrete, I could simply stack the following stones on top of the previous row. The following day I was able to set the 4th row and and completely fill it with concrete.

The top layer of concrete was then removed cleanly with a trowel.

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Drainage and rain protection for the shell wall

Since the area behind the wall was to be backfilled with the excavated material, I wanted to create a load balance for any rainwater that might accumulate.

For this purpose, I have concreted small HT pipes in the lower area of the wall through which the water could then run off. On the slope side, I have laid a gravel bed in front of the HT pipes so that the pipes are not blocked by the soil.

An additional drainage hose behind the wall should then also reliably direct the remaining backwater to the side past the wall. Today after almost 3 years I can say: It worked!

Dimpled sheet behind the shuttering stone wall

In addition, with the application of a dimpled sheet, the wall should also be protected against roots and other foreign effects.

I first rolled out the dimpled sheet on the wall and then lowered it behind the wall. With the studs facing the wall, I then fixed the mat in place with drywall screws, which I screwed into the joints of the formwork blocks.

Now the whole thing could dry in peace before I could start with the backfilling.

Secure slope with shuttering stone wall – project filmed in time lapse

You can also watch the construction of the formwork wall at the new carport to secure the slope in the following time-lapse video.

You can find my videos about building the carport in my playlist Project Carport – Building a Carport on a Slope by Yourself. If you want to see more of me and my projects, feel free to check out my YouTube channel.