Here's how to do it right

This is how you can fill formwork blocks:

• Flow concrete: simple and reliable method for resilient concrete walls
• Stones: as filling material for non-supporting structures
• Earth: ideal for stones that are to be planted later
• sand: is suitable as a gap filler in combination with concrete

Flow concrete

So that the liquid concrete does not come out of the crevices when pouring, you have to put the stones close together. A spirit level and wall cord will help you to align the elements vertically and horizontally. If the subsurface is uneven, we recommend leveling it with a thin layer of mortar. Then you bring in the reinforcement so that the wall and wall become stronger and more resilient.

Filling

Order the flow concrete you need from a supplier. Filling is convenient and easy with the help of a concrete pump, which pumps the mass from the mixer into the formwork blocks. Liquid concrete usually compacts automatically. A wooden stick serves as a poke aid for critical areas in order to manually loosen air bubbles. The material is resilient within 24 hours, whereby it reaches its full strength after 28 days.

Stones

Filling with concrete is necessary when the stones are subjected to pressure. Loose materials such as Grit,(€ 44.95 at Amazon *) Gravel or crushed stone if the wall is used for decorative purposes and is not subject to the load of earth masses. If there is no concrete or stone wall crown, the entire construction must be permeable to water. Filling the bottom shuttering blocks with concrete is therefore not recommended.

Earth

So-called plant rings or Embankment stonesthat are open at the top and bottom turn out to be popular and decorative garden elements. These formwork blocks can be flexibly combined and planted. Filling in with earth makes the structure heavy enough to secure slopes and withstand the pressure of the earth masses. When stacking, you should make sure that the individual rows are shifted slightly to the back. Part of the wall remains open and offers space for later planting.

Hints

The bottom row of stones is set in damp concrete, which will later serve as a foundation. Since the stones are open, the rainwater must be able to seep onto the concrete surface. Before setting, make deep grooves in the mass that drain the water. A layer of gravel under the soil filling promotes good water drainage.

sand

For smaller walls that do not have any special support functions, sand residue is sufficient to fill the gap. If you want to fill concrete and sand in several layers on top of each other, you have to work in a water-impermeable intermediate layer. Otherwise, the sand will pull liquid out of the concrete so that it does not achieve its full strength. A piece of cement wrap or a garden pond liner will help.