Gravel for water drainage
If you want to ensure that water has to be able to seep away, it's worth a little more effort: To do this, lift the floor plan of the terrace between 30 and 80 cm. In any case, so far that the root area of the lawn is removed and there is enough space for a seepage layer. First you fill in the area with gravel.
This is followed by a slightly flatter layer of gravel, which is covered with weed fleece. This is followed by supports in the form of exposed aggregate concrete slabs, strip foundations or other foundation stones. The supports are designed according to the spans of the substructure.
The substructure is straightened with a spirit level and straightening board. Unevenness can be compensated for with additional terrace pads, scrap floorboards or by adjusting the terrace feet.