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Cementatious Slurry System

A crosssection of how the system works

What is Traditional Basement Tanking Slurry?

Tanking slurry is used within building structures i.e. cellars, bunds and other below ground areas. It is also suitable in providing a waterproof damp proofing barrier where damp proof course treatment may not be possible. The product is made up of many components, which give high water resistance, flexibility, salt resistance, good adhesion and set control in a form that only requires water for mixing.

Our Tanking Slurry is a premixed formulation of plastic modified hydraulically setting powder. When mixed with water and SBR Bonding Agent it can be applied to a masonry substrate to form a monolithic bond, blocking the passage of water as well as becoming an integral part of the structure.

SBR Bonding Agent should be used as a primer between coats and diluted 3:1 in the gauging water. This will create a structural waterproofing system commonly referred to as tanking within the industry.

In certain circumstances we recommend the use of Salt Neutralisers where there is evidence of Salt contamination in the area to be tanked. Fillet Seal and Restor Set Rapid are also available for pressure areas where the wall meets the floor and where there is running or weeping water.

What does the tanking process involve?

The use of slurry is far more laborious than modern basement membrane systems. Preparation is essential to make sure that the surface the solution is being applied to is in a stable and strong enough position to support the water pressures that will be exerted on it once the tanking system is fully cured. Areas such as paint removal, loose brickwork/pointing or large cracks all need to be addressed prior to waterproofing.

Once these have been addresesed then the floor needs to looked at. If it is an original floor then the bricks can either stay if no extra head room is required, concreted and then tanked over. If however additional headroom is required then underpining is a must (major expense) before a new concrete slab can be installed at a lower depth.

Wall/floor juctions are strengthed with a mix of SBR liquid latex and cement (known as 'fillets') as this is the weakest point in any basement.

Once all loose materials are removed from the wall (sand blasted if necessary) then the first coat of waterproof render can be applied to the brickwork. This holds back any hygroscopic salts that are present in the brickwork and ground water and stops them from damaging the coating of tanking slurry which is applied next. Once the first coat of slurry has hardened (90minutes) then the second coat is added. At this stage a layer of dry blinding sand is applied (thrown) at the wet second coat (keyed),and is then allowed to cure (24 to 48hrs). The finishing coat can either be a) sand/cement render b) over boarded. This is the waterproofing stage complete.


Preperation is paramount and time consuming so therefore expensive
Materials relatively inexpensive but the work is very laborious and therefore expensive.
The walls and floor have to be in A1 condition for this method to be accepted and guaranteed.
Does not allow the passage of water so pressures will build and the water will find an alternate route i.e next doors basement or worst case scenario buckle your basement wall.

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  • Basement Tanking being applied by trowel
  • Tanking slurry being applied by brush
  • Completed tanking system

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23 November 2020
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