The White Tower, at the Tower of London had external gutters. The technology was subsequently lost, but was re-introduced by the Normans. The Romans brought rainwater systems to Britain. Clogged gutters can also lead to stagnant water build up which in some climates allows mosquitoes to breed. Ĭlogged gutters can also cause water ingress into the building as the water backs up. Rain gutters can be equipped with gutter screens, micro mesh screens, louvers or solid hoods to allow water from the roof to flow through, while reducing passage of roof debris into the gutter. Water from rain gutters may be harvested in a rain barrel or a cistern. Alternatively it would connect via a gulley (u-bend) with 50mm water seal to a combined drain. The down pipe can terminate in a shoe and discharge directly onto the surface, but using modern construction techniques would be connected through an inspection chamber to a drain that led to a surface water drain or soakaway. Water collected by a rain gutter is fed, usually via a downpipe (also called a leader or conductor), from the roof edge to the base of the building where it is either discharged or collected. Parapet gutters and valley gutters discharge into internal rainwater pipes or directly into external down pipes at the end of the run. When two pitched roofs meet at an angle, they also form a pitched valley gutter: the join is sealed with valley flashing. Water falls towards a parapet gutter, a valley gutter or an eaves gutter. For slate this will be at 25%, for machine made tiles it will be 35%. The pitch of a pitched roof is determined by the construction material of the covering. They can drain internally or to an eaves gutter, which has a minimum 1 in 360 fall towards the downpipe. A flat roof should have a watertight surface with a minimum finished fall of 1 in 80. The water drains into a gutter that is fed into a downpipe. Ī roof must be designed with a suitable fall to allow the rainwater to discharge.
Lead was a popular liner and is still used in pitched valley gutters.
Guttering in its earliest form consisted of lined wooden or stone troughs. The word gutter derives from Latin gutta (noun), meaning "a droplet". An eaves gutter is also known as an eavestrough (especially in Canada), spouting in New Zealand, rhone ( Scotland), eaves-shoot ( Ireland) eaves channel, dripster, guttering, rainspouting or simply as a gutter. Water from a pitched roof flows down into a valley gutter, a parapet gutter or an eaves gutter. In the case of a flat roof, removal of water is essential to prevent water ingress and to prevent a build-up of excessive weight. It is necessary to prevent water dripping or flowing off roofs in an uncontrolled manner for several reasons: to prevent it damaging the walls, drenching persons standing below or entering the building, and to direct the water to a suitable disposal site where it will not damage the foundations of the building. Component of a water discharge system Lead guttering: slate and pitched valley gutter flow into parapet gutter, with downpipe and overflow Eaves gutter and downpipe Decorative lead hopper head dated 1662, Durham CastleĪ rain gutter, eavestrough, eaves-shoot or surface water collection channel is a component of a water discharge system for a building.
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