Prepare underground for terrace

Prepare underground for terrace: underground

For a long time to enjoy a self-paved terrace, not only the planning, but also the execution must be done carefully. This necessarily includes the proper application of the substructure, which consists of several layers of material and was compacted several times.

Without a tightly packed substructure For the terrace, concrete slabs or paving stones sink and underwash. Settlement and material damage are then inevitable. Therefore, you should plan and understand exactly what materials and preparations are needed, how to stake out the terrace area, make the excavation, the curbs sets and the supporting layer fills.

Only in this way can the enjoyment of the newly created terrace be maintained for a long time many cozy hours with friends or family be spent on it.

How to prepare the area?

Prepare underground for terrace: terrace

Before the construction of a terrace If possible, you should have the necessary materials delivered to your doorstep, even better up to the work surface in the garden. For a stone terrace, gravel or gravel are needed in addition to terrace covering and edging as material for the terrace surface. For staking the area you need a guideline, metal or wooden pegs, a hammer, a spirit level and a longer wooden board. Spade, shovel, pickaxe and wheelbarrow can be important for the excavation. Curbs, a hammer and concrete are needed for setting the edging.

With a handstamper you can condense the substructure of the terrace. However, if you want to work fast, effectively and professionally, you should rent a vibrating plate from the building materials dealer or via the tool rental service (see sector telephone book). It's worth the effort because with a simple hand rammer can hardly create such a solid ground as with this easy-to-use machine.

How to stake out the area?

Prepare underground for terrace: prepare

When building a terrace in the garden, the area should be created so that you can still enough space for later edging Has. The staked field should therefore correspond to the planned terrace area plus 20cm working space.

Best used short wooden or metal pegs, which are hit with a hammer in the ground. In a simple rectangular area usually four pegs are sufficient, which are connected with a guideline. The height should be selected according to the later top of the pavement so that it can serve as a guide for laying the terrace blocks and slabs.

In addition, the guideline for rainwater drainage a gap between one and three percent from the house to the garden include. This is determined by leaning a spirit level onto simply a longer wooden straightening stick in the shape of a longer board and tilting accordingly. One percent slope means one centimeter difference in height per meter.

How to plan the substructure for the terrace?

The choice of the right foundation for the terrace and the corresponding depth of the excavation depends on the strength of the soil, the expected load, the planned substrate and the desired decking. The excavation depth should be selected so that the foundation and decking together reach the desired height below the threshold and at the same time flush with the lawn edge.

Do you want one Stone terrace in the garden paving, it is usually sufficient to remove about 30 to 35 cm of soil for the excavation. Then you have enough space the various layers of the foundation and the paving. For terraces that consist of a contiguous concrete slab and may be tiled, you should make an excavation of at least 80 cm. For this type of terrace, deeper concrete strip foundations are required for the floor slab.

How to do the excavation?

For the excavation of the area Spades or shovels are used to remove the unsustainable soil such as loam or topsoil to the desired depth. If there are many stones or a hard ground, the use of a pickaxe may be necessary. With the wheelbarrow you can transport the collected earth afterwards or later. Either to distribute the soil in the garden or dispose of it as organic waste.

The level ground plane created during the excavation is also called planum. If the terrace substructure does not already have enough strength for the further construction of the terrace, the area must be compacted. For this you use the handstamper or the vibrating plate. There must be no bumps or dips, where rainwater can accumulate. In addition, the substructure of the terrace should run according to the selected gradient. As a check, you can again use the wooden board and the spirit level.

How to run the border?

With a bordering is prevented that the terrace covering and the underlying layers of the terrace substructure slide sideways. For this reason, lawn curb stones made of concrete or natural stone, paving stones, palisades, L bricks or wall slabs are placed in a 10 to 20 cm thick, earth-moist concrete bed and aligned along the previously tensioned guide line. For concrete blocks you use a rubber hammer, for natural stone you can also use a metal hammer.

As a further stabilization of a border of curbs or a row of paving stones on the outside additionally piled up concrete as a back support and tapped. Care should be taken to ensure that the concrete foundation is not too high, since adjacent grass can turn yellow in periods of drought. And if you also want to cut as little as possible when laying the terrace slabs or stones, you should choose the position of the edge enclosure or the size of the terrace accordingly.

How to lay the foundation for the terrace?

Prepare underground for terrace: terrace

Frost protection layer and base course are made of gravel or gravel (mineral mixture or RCL). They serve the frost protection and the ventilation of the soil. For gravel you should use a grain size of 0 to 32 mm and plan a layer thickness of at least 10 cm. Gravel is especially recommended for heavily polluted areas, since such a support layer is much more sustainable than a Kiestragschicht. The gravel should have a grain size of 0 to 45 mm and a layer thickness of 13 cm.

The material for the layers of the substructure is distributed on the surface with the gradient on the surface and compacted several times with a manual rammer or vibratory plate. One should compact the foundation of the terrace at least three times and also fill only layer by layer. All layers for the terrace pavement should remain drainable, d. H. the natural water cycle should not be interrupted by the foundation.

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