Graphical Construction Glossary >> Roofs and roofing. >> Roof Features >> rainwater head
Rainwater heads or conductor sumps are a means for the rainwater control system to handle unexpected heavy loads, and if necessary to overflow.
Because they do not have a top on them they are designed to overflow rather than allow the lot more serious condition of water backing up inside the external walls.
To allow them to do their design function they should be checked periodically to make sure that they have not become clogged by extraneous materials.
Note! The whole of a rainwater control system should be checked from time to time. In particular just before an expected wet season.
My version of Murphy's law states "that anything that can be thrown onto a roof will be thrown onto a roof". In addition expect to find leaf mould, small animal nests etc. etc.
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"When we build, let us think that we build for ever."John Ruskin 1819-1900
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