With grit, gravel and terrace slabs you can build a perfect terrace. But one must pay attention to a few things besides a sufficient gradient. One of them is a strong border, so that the stones can not slip.
Observe the gradient for the substructure
A gradient of about two percent is completely sufficient for the substructure for terrace slabs. But the water always has to be diverted away from the building. It should not even flow sideways from the terrace, but always on the opposite side of the building.
Border surround provides support
Over time, patio slabs move slightly and literally wander off into the garden. This is well prevented with a border. This should be used in some rough dry concrete. Otherwise, the enclosure itself does not have sufficient support.
Chippings and gravel for the substructure
If the soil has been dug up accordingly, all you have to do is spread some sand and then spread it out on the gravel. Even the gravel should be shaken or stomped well. This is a vibrator best suited.
Subsequently, the split layer is applied. These should also be compacted well before laying out the terrace slabs. If you like, put on the gravel layer still a weed fleece, so that not so much herb grows in the joints later.
What you need for a solid substructure
- Sand not sieved
- Gravel from 5 to 45 millimeters in size
- Gravel from 2 to 5 millimeters thick
- possibly weed fleece