To ensure a successful installation of the tank, there are specific requirements for the excavation. First, we need the excavation to be dug according to our provided drawings, with a 500-millimetre working border around the edges. This space allows our team to access the sides and install the tank effectively.
The excavation should be graded, stepped, or leveled to provide a safe entry and exit. It’s crucial to prepare the bottom of the excavation with a layer of shingle or gravel, ideally 50 to 100 millimetre thick. The preferred material is pea gravel or pea shingle, around 10 millimetre in size. This material compacts well and doesn’t contain excessive fines that could wash away or create voids under the tank.
If pea gravel is not available, alternative materials may be considered, but our technical team will need to review photos to determine their suitability. It’s essential that the material is non-angular to prevent any damage to the tank’s membrane or textile, as these tanks are designed to store water. Materials like sharp sand or 6F2 are not suitable for the base of the excavation.
In summary, providing the required working space, grading the excavation, and using the appropriate non-angular shingle or gravel will ensure a proper foundation for the tank installation.
