Newtons supply two quality external drainage membranes together solutions and ancillary products for the reliable removal of ground water.
Newton 406 Geodrain has a 6mm drainage layer and a vertical water flow of 1.27 litres per metre squared per second.
Newton 410 Geodrain has a 10mm drainage layer and a vertical water flow of 4.60 litres per metre squared per second.
Ground water removal is required to ensure that the primary waterproofing membrane is not in permanent contact with ground water
pressure so as to comply with the recommendations of the landmark case ’Outwing V Thomas Wetherald’ which decided that it was
not possible for the primary waterproofing membrane to be 100% defect free.
With large basements, the cost of proving a structural solution to deal with ground water pressure can be impractical or very costly.
Newton System 400 drainage membranes can be used as part of a designed de-watering system that reduces or removes the water
pressure to the tolerances of the structural design of the basement.
Newton’s range of external drainage membranes are used to protect
•Foundation and retaining walls
•’Concrete box’ new-build basements
•Underside of concrete rafts
Newton System 400 drainage membranes provide a means of removing ground water from basements or retaining walls or rafts and
can be used in conjunction with primary waterproofing barriers such as Newton 902.
In most cases however, we find that Newton System 500 internally drained waterproofing is the safest option to provide the dry basement
required. We suggest that Newton System 500 be explored as the waterproofing system or that Newton System 400 external
drainage membranes are used in conjunction with Newton System 500.