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The discharge of water from upper roofs, through downpipes directly onto tiled roofs, should be avoided. However, in cases where water is discharged onto a tiled roof, the following requirements are necessary:
- A spreader must be used at the base of the downpipe. The spreader must be sealed at both ends to prevent water discharge into the side lap of the tile.
- Under the spreader an outer flashing (usually lead) should be installed and dressed into the profile of the roof tile.
- The roof area below the spreader should be sarked for a minimum width of 1800 mm either side from the point of discharge and extended down to the eaves gutter or valley.
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