KEMPEROL® 1K-PUR Waterproofing - KEMPER SYSTEM

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Technical Information 21 Checking – Assessing – Preparing the substrate General The most important requirement for the success and long-term adhesion of KEMPER SYSTEM products is the bond with the substrate and its testing, assessment and preparation. Ignoring this requirement is the most common cause of defective workmanship, defects and complaints. Balconies, terraces and patios can have many different substrates, e.g. old ceramic tiles, mastic asphalt, old paint, or concrete/screeds. According to the requirements of DIN 18365 "Flooring works", any substrate that is to be waterproofed must be firm, clean and free from all loose material, dust, dirt, oil and grease. According to the German Contract Procedures for Building Works (VOB), the contractor must test the substrate to ascertain its suitability for the specified covering. The contractor should inform the client immediately in writing if he has any doubts about the suitability of the substrate for the specified works. Checking the moisture content of the substrate In all cases, the moisture content of the top 20 mm of substrate may not exceed 5%. In the case of a fresh cement screed or concrete surfaces, a coating is not possible until the moisture content (equilibrium moisture content) of the material has dropped below 5%. This is usually not until 28 days after laying the screed or placing the concrete. In the case of substrates in contact with the soil, they must be adequately isolated against groundwater and rising damp (capillary moisture), e.g. by means of a layer of gravel (filter) plus a damp-proof membrane (dpm). So-called waterproof concrete and waterproofing screeds do not represent adequate protection because they are still permeable to water vapour. A chilled mirror hygrometer can be used to measure the moisture content. Rising damp can be checked by covering an area of approx. 1 m 2 with dense polyethylene sheeting. If the covered area turns a dark colour within 24 hours, rising damp is to be expected. Checking the strength of the substrate In all cases, the substrate must possess adequate strength. The compressive strength of concrete and screeds can be determined with a rebound hammer (Schmidt hammer). A value of min. 30 N/mm 2 is essential. The pull-off strength is determined with an adhesive strength tester. The value must be min. 1.5 N/mm 2 . KEMPER SYSTEM GmbH & Co. KG · Holländische Straße 32-36 · D-34246 Vellmar · Tel. +49-(0)561-82950 · Fax +49-(0)561-829510 www.kemper-system.com · Certified according to DIN EN ISO 9001:2000 and DIN EN ISO 14001:2004
KEMPEROL ® waterproofing systems are elastic, have a high inherent strength and can bridge over cracks, but as they are very thin (approx. 2 mm), they cannot perform a load-distributing function. Preparing the substrate The substrate should be prepared in such a way that a permanent, strong bond is achieved between the system to be applied and the substrate. To achieve this, the substrate must be consistently firm and free from all separating substances, sharp edges, burrs, flashes, fins, etc. The choice of a suitable preparatory method depends on the condition of the existing surface, the specification and the waterproofing system to be applied. Besides the "traditional" methods of treatment • grinding (grinder) • cutting (angle grinder, floor saw) • chiselling (chisel) • hammering (chisel scaler, needle gun) • brushing (brush, rotary brushes, brush machine) • planing (planer) • sweeping (broom, magnetic broom, sweeping machine) • blowing off (hot/warm air) • vacuuming (industrial vacuum cleaner) the following cleaning and blasting equipment • water-jet cleaner up to 5 N/cm 2 (0.5 bar) • steam cleaner up to 5 N/cm 2 (0.5 bar) • high-pressure water-jet cleaner up to 4000 N/cm 2 (400 bar) • wet-blasting equipment with blasting medium recovery • mist abrasive sandblasting equipment • wet abrasive sandblasting equipment • dry-blasting equipment with blasting medium recovery • free-jet pressure equipment • flame cleaning to DVS 0302 • liquid nitrogen cleaning • infrared cleaning are also described in publications (ZTV-SIB / DAfStb). Cleaning methods using solvents are also still in use, particularly in the case of greasy or atmospheric pollution and/or flexible synthetic sheeting. KEMPER SYSTEM GmbH & Co. KG · Holländische Straße 32-36 · D-34246 Vellmar · Tel. +49-(0)561-82950 · Fax +49-(0)561-829510 www.kemper-system.com · Certified according to DIN EN ISO 9001:2000 and DIN EN ISO 14001:2004
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KEMPEROL® 1K-PUR Waterproofing - KEMPER SYSTEM

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