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Fin drains are a type of land drain pipe that have been revolutionised over the past 25 years or so by the growth of composites, ie, sheet materials which use two membranes separated by a ‘core’ or ‘geo-grid’. The idea is that the centre functions as a water station while the membranes prevent ingress of clay and dirt particles. They’re meant to reduce/eliminate the need for a backfill material and reduce costs and both construction time.
Fin drains are narrow trenches which might be thought of as’high-tech’ property drains. They use a ‘geo-grid’ sandwiched between layers of ‘membrane’ or ‘geo-textile’ that act to direct any groundwater or surface water right into a traditional piped drainage system.