A basic and necessary condition for the proper functioning of swimming pools and water tanks is the non-loss of water. Otherwise, problems arise, the restoration of which requires high direct and indirect costs. Sealing of Pools - Tanks
As an indirect cost can be considered the cost due to stoppage of operation (eg drinking water tank in a hotel, hospital, etc.). In addition, in case of failure and continuous leak, there is a constant cost of energy consumption and also water for the constant filling of the pool or tank. In addition, the adjacent areas are significantly affected.
SEALING SWIMMING POOLS WITH CEMENT MORTAR
Its waterproofing concrete it is done from the inside of the pool with waterproofing cement-based materials, preferably with a crystalline structure and deep penetration. This sealing is a barrier for pool water leakage, but at the same time for the inflow of underground water to the pool.
Sealing of Pools - Tanks
These materials, in fact, cannot be elastic. As known, elastic cement-based waterproofing mortars are resistant only to positive water pressures and not to negative ones. Therefore, they would not be able to prevent the inflow of groundwater.
Points of attention are the following:
- The walls of the pool should not exceed the specified length, without the provision of an expansion joint since the next layer, the leveling cement mortar, is not as elastic as its underlying one (the elastic cementitious sealant) and usually cracks.
- The point where the slope of the pool changes, i.e. the point at which the pool begins to deepen sharply. It is a vulnerable point and should be investigated by a structural engineer during the design phase due to the steepness and uneven load reception that the deeper part of the pool receives compared to its elevated part. At this point, differential settlement is usually observed and therefore failure of the waterproofing layer.
SEALING SWIMMING POOLS WITH SYNTHETIC MEMBRANES (Liner)
It is a unique choice for prefabricated pools but also an alternative choice for concrete pools. The lining is made by welding PVC sheets to ensure complete watertightness of the tank with the condition of the existence of special components for fitting the jacket.
Not exposing it to the sun as it can cause discoloration of the membrane, but also the constant presence of water in the tank throughout the year.
Also, the slightest irregularity of the substrate is imprinted on the mantle so absolute flatness of the substrate is required.
Finally, special attention is required in the connections of the membrane with the components (lights, outflow, inflow pipes, overflows) while care should be taken so that the membrane is raised on the vertical walls to the top and turns on the horizontal crown of the overflow.
In the water removal passages, a piece of membrane (pants) is placed which "embraces" the entire pipe and is fixed by total gluing with a special PVC glue as the case may be. Then a special collar is placed and sealed with polyurethane mastic.
SEALING SWIMMING POOLS WITH EPOXY PAINTS
Painting with epoxy paints is the lowest cost option (compared to the previous solutions). However, this solution requires more frequent maintenance care and requires the substrate to be smooth, without irregularities, without moisture.