Check of layer thickness and thorough drying of waterproofing products
The respect of layer thickness is one of the main issues when waterproofing with cement-based materials or polymer-modified bitumen thick coatings (PMBC) for obtaining a watertight, reliable and sustainable performance when waterproofing basement walls. For this reason, great importance is attached to the minimal layer thickness in the regulations/standards for waterproofing, such as standard DIN 18533 "Waterproofing of Ground-contacting Building Structures", the PMBC guideline "Guideline for Planning and Execution of Waterproofing Works with Polymer-Modified Bitumen Coatings (PMBC)", the FDP guideline "Guideline for Planning and Execution of Waterproofing Works with Flexible, Polymer-Modified Thick Coatings (FPD)" or the MDS guideline "Guideline for Planning and Execution of Waterproofing of Ground-contacting Building Structures with Cement-Based Waterproofing Slurries". All 3 guidelines are issued by the German Construction Chemicals Association.
Whenever using brush-, trowel- or spray-grade cement-based or bitumen-based waterproofing materials, the total layer thickness must be checked in order to guarantee their watertight efficiency. Since the thorough drying depends upon the layer thickness, this must be checked before the excavation will be backfilled.
Step by step
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3. The insertion of the woven glass fiber mesh weber.sys 981 makes visible if the layer thickness is sufficient.
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4. The layer thickness control with the notched trowel weber.sys Schichtdickenkelle is also possible. Whatever the hand angle is, the layer thickness remains unchanged (3 mm). Here with the 2-comp. lightweight bitumen water-proofing thick coating weber.tec Superflex 10.
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5. This special notched trowel allows better layer thickness control also for the 2-comp. reactive water-proofing slurry weber.tec Superflex D 2 or the 2-comp. reactive, thick and quick-setting waterproofing coating D 24.
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6. Smoothing of the second layer weber.tec Superflex D 2 or D 24 (applied with special notched trowel) with flat trowel.
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7. Whenever cement-based water-proofing slurries, for ex. weber.tec Superflex D 2, are applied with flat trowel, their uniform layer thickness can be checked very well with a notched trowel. Here application with the flat trowel weber.sys Aufstreichkelle equipped with the blade Zahnleiste n° 2 (tooth size 5 mm).
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8. Smoothing of the second layer weber.tec Superflex D 2 (applied with notched trowel) with flat trowel.