A common problem. Water enters the building from the exterior wall. The cause of this is often a missing or faulty exterior waterproofing. The consequence? Moisture, in extreme cases even flowing water, penetrates the wall and enters the living space. This moisture transports destructive salts into the building and creates a moist, musty and unhealthy environment. To repair a defective exterior basement waterproofing, it would seem easiest to excavate the wall. This type of repair is often not viable because an excavation is either too expensive or laborious. The solution? An easy method and economical alternative is to work from the inside with a negative waterproofing. Cursor NB1 Gray was developed to reliably waterproof mineral substrates like masonry and concrete even from the negative side. It contains ingredients that react with the moisture in the wall as well as the components of the substrate to produce crystals that block the pores. Cursor NB1 Gray penetrates into the substrate and so becomes an integral part of the wall that blocks water transmission while remaining open to vapor diffusion. Cursor NB1 Gray will not detach from the substrate. The expected lifespan of the waterproofing is as long as the building itself. Old moist plaster must be completely removed. The wall must be freed of loose particles and cleaned. In areas where flowing water can enter the building or where water stands on or weep stand the wall. Cursor KD2 blitz powder is used to stop the active leakages and seal the wall. This one of a kind highly reactive powder reacts immediately with water. Active leakages can be stopped within seconds. A dejan reducing coatings on the floor such as paints have to be removed and smooth surfaces roughened to achieve an optimal addition to the mineral substrate. Absorptive or salt contaminated substrates must be primed with Cursor Polysil TG500. It solidifies the masonry and locks in the salts. Using Cursor Repair Water Plus, a rounded fillet is installed to protect the water proofing in the wall floor junction from damage. The walls and other surface defects are filled to provide a smooth and uniform substrate for the waterproofing. The mineral waterproofing slurry Cursor NB1 grey is mixed and applied with a brush or appropriate spring equipment in two layers. It is important to apply the material evenly and to work it in all directions to fill all holes and to guarantee complete coverage. Each fresh layer is hardened by immediately spraying it with Cursor Polysil TG500. Cursor Polysil TG500 speeds the curing reaction of the slurry and improves the mechanical resilience of the coating. The mineral waterproofing slurry Cursor NB1 grey is tested to resist a water pressure of 13 bar, has drinking water certification, is resilient to chlorides and sulfides, self-heels micro-cracks. Due to these characteristics, Cursor NB1 grey is a very versatile material and can be used for example in basements, shafts, tunnels, drinking water tanks and silos. You can find all the important information in the system brochure, negative side waterproofing systems for masonry and concrete.