scope:

The guidance given in this document is applicable to the waterproofing of ballasted Underline Bridge decks.

It is not applicable to;

• other parts of Underline Bridges, such as below ground surfaces and abutments,

• Underline Bridges constructed by a tunnelling technique where the external faces are inaccessible for the application of waterproofing,

• overline bridges,

• the repair of an existing Waterproofing System (but see ).

Purpose

The purpose of this Guidance Note is to supplement NR/L3/CIV/041: Waterproofing Systems for Underline Bridge decks by providing information on;

• the types of Waterproofing System, and their components,

• the selection of a Waterproofing System for a particular bridge deck,

• the detailing of a Waterproofing System,

• the application of a Waterproofing System,

• the performance criteria for Waterproofing Systems.

The information provided herein will be of use to those specifying Waterproofing Systems via the 110-114 Sections of the Model Clauses as given in NR/L3/CIV/140: Model Clauses for Civil Engineering works.