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Building Regulations and Flood Risk Mitigation
NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
The Building Regulations do not set any requirements for resistance to flooding. However, where planning permission is granted for a building in an area considered to be at risk of flooding, or where
flood-riskdrainagemoisture-resistanceResistance to moisture from the outside - General
6.7NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
As well as resisting the passage of moisture from the ground, an external wall should give protection against precipitation. This protection can be given by damp proof courses, trays and flashings (se
protection-from-fallingmoisture-resistanceDeflecting penetrating water to the outside of external walls
6.8NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
External solid and cavity walls should be constructed to deflect penetrating water towards the outer face of the wall such as in the following locations – (a) below copings at the top of walls (see Di
moisture-resistanceglazing