Sika® Cavity Drainage System creates a water management system to control water after it has penetrated the structure. Utilising a high density polyethylene internal drainage membrane, the system is installed, loose laid in flooring applications and attached to the wall with surface plugs in vertical installations.

The system directs penetrating water into a drainage system and a collection sump before using a pump to discharge water from the building. A cavity drain provides protection from the ingress of water. Suitable for above and below ground usage.

The membranes are fixed to the walls using special plugs with minimum surface preparation required to the substrate. Once the membrane has been fitted, wall surfaces can be dry lined or plastered and the floors can be screeded.

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FAQ

What is a cavity drainage system?

A cavity drainage system is a Type C waterproofing method that manages water entering a basement or below-ground structure by allowing it to flow behind a dimpled membrane applied to internal walls and floors. The water is directed into perimeter drainage channels, collected in a sump chamber and then pumped safely away, keeping the interior space dry and protected.

How does the Sika® Cavity Drainage System work?

The system uses the Sika® Standard Drainage Membrane on the walls to direct water downwards and the Sika® HD Drainage Membrane on the floor to guide the water into perimeter channels. From there, it’s collected in a sump chamber, then discharged by the Sika® Pump Pro Battery Back Up.

On which surfaces can the Sika® Cavity Drainage System be installed?

The Sika® Cavity Drainage System is suitable for concrete, brick, stone or masonry surfaces.

What are the typical applications for the Sika® Cavity Drainage System?

The Sika® Cavity Drainage System is typically used for waterproofing the walls and floors of basements and cellars.

What are the advantages of using a cavity drainage system?

The Sika® Cavity Drainage System offers several key benefits:

  • Can be used where the substrate does not have the strength to resist stresses caused by water pressure
  • Can accommodate minor movements within the structure
  • Limited surface preparation required
  • Acts as a vapour barrier
  • Can be used to grades 1-3 according to BS 8102:2009
  • Suitable for high water table according to BS 8102:2009