Tanking Slurry

IMG_7495 The Chiltern Slurry Tanking Slurry waterproofing system provides a solution to water leakage, ingress or seepage in concrete structures or any cementitious substrate. The formation and development of insoluble crystals into water bearing capillaries and fissures effectively blocks the further passage of water and ensures permanent water tightness for the life of the structure.


This is a long term solution for life not a short term fix like others companies provide . Minimum ten Years Guarantee.


The Chiltern slurry system is designed to function against water penetration in various conditions. Chiltern Tanking Slurry is supplied as a powder and when mixed with water, is applied directly to concrete, blockwork masonry or cement renders in areas where general waterproofing is required. Chiltern Tanking Slurry is used in conjunction with Chiltern Super Plug for instant leak plugging.

Chiltern Hills tanking Slurry can be applied to new or old structurally sound surfaces. It can be applied either to the negative or the positive side and will negate dampness in ground water permeation even under hydrostatic pressure.

Chiltern Hills Tanking Slurry can be used for the following applications.
• Retaining Walls and columns in reservoirs
• Swimming Pools prior to tiling or painting
• Concrete drinking water tanks
• Water Treatment and sewerage plants
• Foundation Slabs
• Underground Cellars, basement car parks, garages, etc.
• Pre-stressed and pre-cast concrete units
• Tunnels, silos, irrigation channels
• Bathrooms, kitchens, etc
• Lift Shafts
• Vehicle maintenance pits

Technical Data

The vast majority of tanking slurries available today are simply waterproof surface coatings that form a skin to stop the ingress of moisture.  If a crack appears due to movement or freezing conditions(especially if used externally) this will break the integrity of the waterproofing.  Our Tanking slurry incorporates silica in its blend.  The silica swells on contact with water and blocks all the minute cracks and fissures in the substrate and in so doing penetrates into the wet substrate.  This means that if the surface is scratched at a later date the waterproofing’s integrity is never breached.  In fact it will last for the lifetime of the substrate.  This gives an added advantage of using on retaining walls and backfilling.  Even thick poly membranes can tear and rip in certain situations.

There are no polymers in Chiltern Slurry.  Most tanking slurries are polymer modified to make them waterproof.  The reason we use silica instead of polymers is because of the restrictions of a polymer based material.  CS Tanking can be used on applications where alkalines, oils, acids and diesel solvents are involved.  Polymer based slurries cannot be used in these situations as the solvents will soften the polymer.  This opens up areas such as fuel tanks,bunded walls,sewerage treatment plants,vehicle inspection pits etc.

CS Tanking has the full WRAS certification so can be used for drinking water containers that service humans,animals and fish.  It can be used for fishponds so no liner is needed.  This opens many other areas of business such as farmland uses, stables, kennels etc.  There is nothing in this product that can harm the land or living creatures and there is nothing on the land that can harm the tanking.  It withstands acids up to ph3.

CS Tanking Slurry has been independently tested to withstand upwards of 7bar pressure (70mtr head of water) so it is one of the strongest available.

In the application guide below we have included the KA Bond SBR.  All the tests and certifications for CS Tanking were given without the use of SBR but, f included, it adds flexibility, better adhesion and added strength. All tests were independently carried out.

SBR is a latex based adhesive of which there are many suppliers.  The KA SBR is one of the strongest and, when used with the tanking, makes a fantastic, more or less foolproof waterproofer.

CS Tanking has been approved by every council in the UK.

Always mechanically mix the slurry and add the powder to the liquid.


CS Tanking must be applied to a cementitous substrate ie.brick,block,stone or concrete.  Remove any coverings eg.paint, bitumen or any type of waterproofing liquid and contaminates as this will restrict adhesion and ingression.  Surface preparation can be best carried out using high pressure water jetting as this has the advantage of completely saturating the substrate prior to application.

Large cracks and defects can be repaired using a 3:1 sand/cement mortar gauged with KA Bond SBR.
Wall Application.

1) Apply KA Bond SBR diluted with water 1:1  to walls.Leave for 10-15mins for it to “tack-off” and apply first coat of tanking.  When touch-dry (4-6 hours depending on temperature) apply second and final coat.  Tanking can be brushed, troweled or sprayed.  Overall finished thickness should be 3-5mm.

Floor Application.

1) Where floor meets wall make a saw cut approx 15mm at 45deg.Make sure the tanking flows into the cut when applying the tanking.

2) Apply KA Bond SBR diluted with water 1:1 to floor area.Leave for 10-15mins for it to “tack-off”.Apply one coat of Chiltern Slurry with 1ltr KA Bond SBR incorporated within the gauging water to every 25kg bucket.  Tanking can be poured, brushed or trowelled in one application to a depth of 3-5mm.

If drylining allow at least 7 days for excess moisture to evaporate before commencement.