K-tub

from Wikipedia, the free encyclopedia

A K-tub is a system for waterproofing buildings made of plastic waterproofing membranes, which can be used as an alternative to the established sealing systems such as black tub (bitumen thick coating or bitumen welding sheets ) and white tub (water-impermeable concrete).

Plastic waterproofing membranes can be used as surface waterproofing ( standard waterproofing in accordance with EN 13967 / in Germany also in accordance with DIN V20000-202 ), as well as in accordance with the test principles for transitions from structural waterproofing to concrete components (PG – ÜBB) and in fresh concrete composite (FBV).

Sealing membranes cover a large area and can be pre-assembled in the factory in order to reduce the need for welding or gluing to seal joints and connections on site. Prefabricated elements with a backing layer of fleece can be inserted into the formwork before concreting in order to achieve a force-locking connection with the concrete. Alternatively, full-surface bonding with the substrate prevents the seal from running behind in the event of leaks.

The differences compared to seals made of plastic-modified bitumen thick coatings (KMB), bitumen welding membranes and waterproof concrete are

  • manual work steps on the construction site are reduced,
  • Weather conditions have less influence on material and installation,
  • There are no drying times or layer thickness controls.

K philosophy to minimize defects

This concerns interfaces where different trades meet, but no one is responsible. For these, the DIN only requires: "Transitions must be tight"! All those working there must devote their full attention to the points that trigger the defect. But this is not always the case - for a variety of reasons.

  1. There are too many boundary conditions (such as manufacturer guidelines) that prevent simple, cross-trade interface solutions.
  2. There are fewer and fewer specialists in construction.
  3. During installation, too much attention must be paid to the most varied of weather conditions
  4.  There is a lack of simple interface solutions on site.

On the other hand, a simplification of points that trigger defects naturally leads to fewer defects. Thus, boundary conditions (manufacturer guidelines) should be replaced by cross-trade and self-explanatory materials and solutions. Practical training is essential for everyone, including university students. Large-scale, weather-independent and easy-to-install materials are to be used. Simple, sight-controlled and automatically sealed solutions are to be selected. Surface waterproofing made of plastic sheets must be standard waterproofing sheets according to EN 13967 , and correspond to the improvement of the existing minimum quality level of DIN 18195 via DIN V 20000-202 , which is only required in Germany .

Such waterproofing membranes can either already be laid in the precast concrete plant or on the construction site under the floor slab (on a concrete cleanliness layer, insulation or foam glass gravel) or in the wall formwork. The membranes are suitable for creating transitions on concrete components with high water penetration resistance (PG-ÜBB) according to building regulations list A, Part 2, Number 2.48. An additional layer is usually provided on the outside to protect the seal. For example, from dimpled sheets , perimeter insulation panels or drainage panels made of bituminized styrofoam .

Norms and standards

  • DIN 18195: Building waterproofing
  • EN 13967: Flexible sheets for waterproofing - Plastic and elastomer sheets for waterproofing buildings against soil moisture and water - Definitions and properties
  • DIN V 20000-202: Application standard for waterproofing membranes in accordance with the European product standard for use as sealing of components in contact with the ground in Germany
  • ATV DIN 18336: sealing work
  • Guideline for the planning and execution of waterproofing with plastic-modified bitumen thick coatings
  • Directive K-tub
  • PG ÜBB: Building waterproofing in the transition to concrete components with high water penetration resistance in accordance with building regulations list A, Part 2, Ser. No. 2.48 ÜBB
  • According to the Building Regulations List (BRL) A Part 2, serial number 2.53, edition 2014/1, a proof of usability in the form of a general building inspection certificate (abP) is to be kept for "Joint sealing of construction and control joints for components made of concrete against pressing and non-pressing water" (as far as these are not listed in the building regulations list Part 2 (2013/2) No. 1.4 or No. 2.53 or Part 1 No. 10.23 and 10.24 can be assigned).
  • According to the Building Regulations List A Part 2 No. 2.48, proof of the usability of "Sealing materials for building waterproofing in the transition to concrete components with high resistance to water penetration" must be provided by means of a general building authority test certificate.

literature

  • J. Weber, V. Hafkesbrink (Hrsg.): Building waterproofing in the renovation of old buildings. BG Teubner Verlag, 2006, ISBN 3-519-00460-7 .
  • K. Lufsky, M. Bonk, E. Cziesielski: Building waterproofing. BG Teubner Verlag, 2001, ISBN 3-519-35226-5 .
  • This is how it is really sealed - special print from building protection / building renovation 1/99.
  • IFB Institute for Building Research e. V .: Investigation of moisture damage caused by faulty building seals, joint project by the Bauherren-Schutzbund eV and the Institute for Building Research eV in cooperation with AIA AG ( Online , PDF, 600 kB).

Individual evidence

  1. ↑ a b Test principles for the issuing of general building inspection test certificates for transitions from structural waterproofing to concrete components with high water penetration resistance (PG – ÜBB), as of September 2010; a new draft has been available since February 2016.
  2. ↑ Overview of the relevant general building inspection test certificates on the website www.abP-Fugenabdichtungen.de; accessed in November 2016