Fireplaces, chimneys and flues

6.8.27Flashings

Flashings and trays shall be capable of adequately resisting the entry of moisture into the building.

Suitable materials for flashings and trays include:

  • milled sheet lead (minimum code 4) to BS EN 12588
  • zinc alloy complying to BS EN 988 and 0.6mm thick
  • proprietary materials assessed in accordance with Technical Requirement R3.