The advice in the building materials markets is often insufficient when it comes to patio slabs. Whether laying with joints or without is often almost a question of faith. In addition, you have to choose between coated and uncoated panels.
Is a joint necessary between the panels?
That depends on the subsoil. An absolutely level surface, such as a concrete floor slab, cannot work. Therefore, the panels cannot move and you don't necessarily need a joint.
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However, if the terrace slabs are laid on the ground and embedded in gravel, the floor can work. Especially when there is frost, there is movement in the plates. If they were laid here without a joint, they could be pressed against each other and thus break or flake off at the edges.
Coated or uncoated - which is better?
Coated panels are naturally more expensive. However, there is also less need to clean and these plates must not be cleaned with a high-pressure cleaner anyway.
Depending on which type of coating is selected, the terrace slab can also be a little more slippery. The risk of slipping due to moisture on coated panels can be significantly increased.
Points to be decided for selection
- Coating of the panels desired?
- Joints required between the individual panels?
- On which sub-surface can the respective panels be laid?
- How high is the build-up strength that is possible on site?