Choosing waterproofing systems

Yassar AltafHi, I am Yassar Altaf, Concrete and Waterproofing Marketing Manager at Sika Limited.

When it comes to choosing the correct waterproofing system for your structure, careful consideration should be given to the selection of a particular product.

BS 8102:2009 provides guidance and recommendations for specifiers of structural waterproofing projects. Some of the guidance is very useful, such as the highlighting the need for consideration to be given to employing dual systems. For example Type A plus Type B protection where assessed risks are deemed to be high. However in some areas it is not as specific as other standards. For instance, no definition of a waterproofing expert is given, which has led to many people now claiming to be ‘experts’. This may prove problematic for a specifier who is looking for advice but receives one sided opinions from manufacturers who only offer one, or a limited number of waterproofing solutions.

Many specifiers still use the ‘copy and paste’ approach, it is often too easy to repeat what has been done before without giving adequate consideration to the individual requirements of each project. This approach can restrict the knowledge of what is available and can lead to wrong choices. Exercise caution when choosing which ‘expert’ you consult as many have limited experience at best and a limited range of solutions, none of which may be right for you.

However Sika is in a unique position to be able to provide a full range of waterproofing solutions from Type A protection to Type C protection, ensuring you are given the best possible solution for your project (For more information please click here to download the Sika full range waterproofing solutions brochure).

BS 8102:2009 outlines three different waterproofing methods, the choice of which should take all of the relevant project requirements into consideration

Type A Protection:
External Waterproofing System

A waterproofing barrier applied on the external surfaces. The structure is protected against water ingress and also against any aggressive substances or influences.

Internally Applied Waterproofing System
A waterproof barrier is applied on the internal surfaces of the structure (negative side). These systems do not prevent damage to the structure from water ingress, nor concrete damage due to aggressive chemicals.

Type B Protection:
Integral Waterproofing System

A waterproofing system integrated into the concrete structure. Liquid water penetration is stopped by the structure itself and cannot entirely pass through it.

Type C Protection:
Internally Applied Waterproofing System
This system directs penetrating water into a drainage system and a collection sump before using a pump to discharge water from the building

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