Waterproofing New-build Basements and Cellars
When constructing a new basement, it is possible to apply the waterproofing system to the internal (negative) or external (positive) side of the basement wall.
Internal Waterproofing
Internally applied systems are popular when waterproofing old basements, but can also be used to waterproof new basements where access to the external side of the basement is problematic - e.g. when building close to other properties or when using contiguous / secant piling or diaphragm walls to construct the basement retaining walls.. However, because of the desire to keep the fabric of the building dry, most newbuild basements are waterproofed externally.
External Waterproofing
When waterproofing basements externally, we would normally suggest the use of a "dual-layer" system. This consists of a primary waterproofing system (e.g. Vandex Cemelast or Vandex Super) protected by a secondary drainage layer (provided by a cavity drainage membrane such as Oldroyd Xv). This secondary layer protects the primary waterproofing system from damage during backfilling. It also lessens the stress put on the primary waterproofing system, reducing water ingress caused by possible imperfections in the application of the primary system and/or structural movement.
To deal with certain site conditions such as high-loam soils, a cavity drainage membrane with a welded geotextile mesh, called Oldroyd Gtx can also be used to provide the secondary drainage layer.
Drainage
When waterproofing externally, a geotextile ground drain is laid around the perimeter of the basement at slab level. This should lead to a sump pump or appropriate discharge point.
Below-Slab Waterproofing
In cases where the slab has an integral waterproofer, it is not always necessary to waterproof under the slab. However, in situations where the slab is not waterproof or there are problems with ground contaminants and/or radon, it will be necessary to extend the waterproofing membrane underneath the slab using Oldroyd Xs and / or to waterproof the slab using Vandex Super. For further information see our floor slab waterproofing page.
Construction Joints
Depending on the method of basement construction, it may be necessary to seal construction joints. We are able to offer a number of joint sealing options for below ground use.
Safeguard currently offer the following RIBA-Approved CPD Seminars free-of-charge to architects and specifiers on the UK mainland:
Technical Support
If you would like a technical representative to contact you about basement waterproofing, please call 01403 210204 or fill in the form below:
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Newbuild Basement 
