scope:

This code of Practice applies to waterproofing systems for all new underline bridge decks, and for maintenance and repair or replacement of waterproofing systems to existing underline bridge decks.

This Code of Practice is not applicable to new structures constructed by thrust boring or tunnelling techniques when external faces are inaccessible for the application of waterproofing, or to other parts of underline bridges such as below ground surfaces and abutments.

PURPOSE
 
 The purpose of this Code of Practice is to provide:
 
 • information required by a specifier to ensure that the waterproofing system selected is compliant with RT/CE/S/041: Waterproofing Systems for Underline Bridge Decks, and suitable for a specific site or underline bridge deck to be waterproofed;
 
• general guidance on waterproofing systems for use on underline bridge decks to ensure the correct preparation and application of such waterproofing to minimise the potential for early deterioration and loss of structural integrity;
 
• an understanding of the variables that can arise during waterproofing.
This Code of Practice is suitable for use by designers and specifiers, constructors, maintainers, and Railtrack staff involved in the procurement of design, construction and maintenance of underline bridge decks.

The application of an effective waterproofing system to an underline bridge deck will significantly extend the structural life of a bridge as the structural life of a bridge is directly related to the effectiveness of the waterproofing system. The effectiveness of a waterproofing system is particularly dependent on design and detailing, together with skill and care taken during the preparation of the substrate, application of the waterproofing system, and subsequent site activities including the laying of the track ballast.