Execution of a waterproofing in thermal pools

Thermal water, i.e water that comes from the earth's interior, is often used for therapeutic purposes. These waters contain minerals and other trace elements in high quantities. However, that which is effective against rheumatism, arthrosis and many other diseases can sometimes attack mineral joints. But soft waters can partly cause dissolution of mineral grouting mortars in the joints due to ion exchange. Whenever damage to the tile covering or the grouting or bonding is to be feared, recourse should be had to a tile fixing system based on epoxy resins. Epoxy resins are resistant to both acidic and alkaline media. They can be used in thermal, spa and therapy pools. For ex. the 2-comp. EP adhesive and grout weber.xerm 848 has been tested according to the KSW recommendation of the German Federal Environment Agency (relating to use of polymers in swimming pool water). At the same time, this system can also be used in septic tanks or on surfaces subject to high mechanical stress.

Simple & safe to the goal

  1. Substrate preparation

    1. Use the primer weber.tec 801 on the substrate.

  2. 2. Levelling is done with the quick-setting levelling mortar weber.plan 819.

  3. 3. Check the substrate temperature prior to application of epoxy products. The surface temperature must be higher than the dew point temperature.

  4. 4. Use the EP resin primer weber.prim 807 on the substrate and apply the flexible waterproofing EP resin weber.tec 827 (pour grade) or 827 S (trowel grade), while the primer is still tacky.

  5. Waterproofing

    1. In case of movement joints, the joint sealing tape weber.tec 828 150 is laid in an omega loop, glued with weber.tec 827 and covered with the same material.

  6. 2. The waterproofing weber.tec 827 is applied with the rake weber.sys Großflächenrakel + triangular notched blade Zahnleiste no. 1 (notch size 2.5 mm) for better consumption control. Then it is smoothed with a flat trowel. Thickness of 1st layer: 1.0 - 1.5 mm.

  7. 3. The waterproofing is brought up to the cleaned and the ground flange of elements.

  8. 4. The second operation step is done after 1 - 3 days. If the tile fixing with the EP resin adhesive weber.xerm 847 cannot be carried out within 5 days, scatter the fresh second layer with the silica sand weber.sys Hartquartzmaterial (grain size 0.1 - 0.5 mm). Thickness of 2nd layer: 0.3 - 0.5 mm.

  9. Tile fixing

    Fix the tiles with weber.xerm 847.

  10. Grouting

    Use weber.xerm 848 for grouting the joints between tiles.

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