Jörg Jude Gebäudetechnik
Construction sealing according to Din 18195
High quality used basements have to be durably protected from moisture coming from the ground. The requirements to the sealing are aligned with the stress by moisture. The revised version of DIN 18195 – 4 from August 2000 newly classifies the service conditions of stress by moisture. It now differentiates between ground moisture, seepage water, non-building-up of seepage water, temporarily building-up seepage water and pushing water. Additionally it incorporates plastic-modified bitumen-thick-coatings as well as cold self-adhesive sealing sheets.
Stonework is principly very suitable for KMB as a foundation because of its absorbency.
Flush-fittings and equalising scratch-fillings are only necessary as a rule, if the stone material is coarse porous or is showing plaster score marks.
The general requirements to the surfaces of sealings like freedom from frost and surface dryness have to be fulfilled. Naturally non-closed depressions over 5mm depth (e.g. mortar bags) as well as non-mortarised butt fugues with a width of over 5mm are to be closed with mortar (as is demanded by DIN 1053 that generally reglements the execution of masonry).
Edges have to be grasped and gorges should be rounded before the assignment.
This can however as well be done with two components bitumen thick coatings by the thick coating itself.
As a general rule KMB are to be brought up on a pre-sprinkling prepared underground.
However this „pre-sprinkling“ can as well consist of a scratch filling of the KMB itself.
The KMB has to be brought up in at least two passes. The application can happen at the loading condition ground moisture on a fresh atop fresh basis and the thickness of the dry layer has to be at least 3mm. The required thickness of the wet layer fort hat has to be stated by the producer. At no place it should exceed more than 100% as dry through problems could develop. Up until reaching rain resistance the area has to be protected from rain effects. Stress from water and frost should be avoided if possible until the through-drying of the coating. Because protective layers are only allowed to be installed until the KMB has adequately dryed through the through-drying has to be checked.
