Watertight mineral waterproofing with subsequently crystallizing agents. Suitable for positive side and negative side waterproofing. A waterproofing made of KÖSTER NB 1 Grey possesses excellent pressure and abrasion resistance, as well as chemical and sulphate resistance.
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KÖSTER NB 1 Grey has been developed to waterproof mineral substrates such as masonry and concrete, even from the negative side. The product contains agents which react with moisture and components of the substrate to form crystals which penetrate into the pores and capillaries of the substrate. KÖSTER NB 1 Grey penetrates into the substrate, becomes an integral part of it and makes it waterproof yet open to vapor diffusion. It has an expected life time the same as the structure itself. KÖSTER NB 1 Grey cannot de-laminate and keeps the substrate permanently waterproof.
The mineral substrate must be sound and solid as well as free of grease, oil, and loose particles. Prior to application, the substrate must be saturated, yet standing water must be avoided. Dusty or salt contaminated substrates are primed with KÖSTER Polysil TG 500. The material must be mixed using a slow speed mixer whereby the powder should be added to the mixing water. The material is applied in at least two coats with a brush or a suitable spraying device. Frost and strong wind impact during the application and for at least 24 hours afterwards has to be avoided.
A 25 kg bag of KÖSTER NB 1 Grey is mixed with 8 l of water. For improved bonding and elastification use 6 l of water and 2 l of KÖSTER SB Bonding Emulsion.