Koster NB1 Grey 25kg Basement Tanking Slurry

: £65.00
£63.70 £76.44

More from this category: See also: ,

Koster NB1 Grey Tanking Slurry

Pack Size 25kg  Coverage( Up to 8M2 @ 2 Coats)

Koster Polysil NB1 Grey – a migratory crystalline tanking slurry used to seal below ground structures against water ingress.

Koster NB1 is considered to be a Type A waterproofing system as defined by BS8102:2009 and is generally used to seal the inside face of basement structures, slabs and retaining walls.

Koster NB1 works by both providing a physical barrier against water ingress as well as providing a migratory crystal sealant that penetrates deep into the structure to seal micropores and cracks against water ingress. This unique combination means that water pressure of up to 13bar can be resisted.

Koster NB1 can be used as a secondary waterproofing system applied before a cavity drainage membrane, or even with a waterproof concrete system.


Mixing Paddle

SB Bonding Emulsion – used in the mixing water to aid application.

Typical Uses Include:

  • Waterproof flat soffits.
  • Waterproof solid basement stairs.
  • Waterproofing lift pits and service trenches.
  • Cellar Tanking.
  • Waterproofing of underpinning and construction joints.

Our guide to using waterproof tanking slurries can be found here.

Product Data Sheet Can be found here.

Koster NB1 BBA certificate – Agrement certificate – can be found here.

Weight 25 kg

Click to open and download:

Data Sheet KÖSTER NB 1 Grey

BBA Certificate – NB1 Grey

MSDS Material Safety Data Sheet Koster NB 1 Grey


3 reviews for Koster NB1 Grey 25kg Basement Tanking Slurry

  1. Robert Trevenna

    Used this to waterproof the underside of a flat soffit in an under pavement room. Worked really well at stopping water coming through the concrete when it rains.

  2. Gywn Owain

    Easy to mix up and apply. Worked really well and filled in all the cracks on our basement wall.

  3. Klodian (verified owner)

    I have been using Nb1 Koster Grey Slurry for over 4 years now, it works very well and it hold water pressure back with no problem, it is recommended that you give it e key coat on the damaged brick work before applying, that’s recommended for any tanking product. Happy with the products wouldn’t swap it for no other. Highly recommended

Add a review

Your email address will not be published. Required fields are marked *

You may also like…