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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. In many cases, combined systems are specified to provide enhanced protection. Examples of newbuild basement waterproofing options can be found on our CAD drawings page. To discuss waterproofing options for specific basement structures, please contact our technical department.

Internal Waterproofing

Internally applied systems are popular when waterproofing old basements, but can also be used to waterproof new-build basements in situations 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... Internal basement waterproofing can be carried out using a tanking slurry (e.g. Vandex BB75, Vandex Super, or Vandex Unimortar 1) or using a cavity drainage system (e.g. Oldroyd Xv or Oldroyd Xv20).

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 , Vandex Super , or Vandex Flexbit) 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.

When waterproofing externally, a geotextile ground drain is usually laid around the perimeter of the basement at slab level. This should lead to a sump pump or appropriate discharge point.

Internal / External Waterproofing

An increasingly popular method of providing combined protection is to tank the basement structure externally (e.g. using Vandex Super) and to install a cavity drainage system (e.g. Oldroyd Xv) internally.

Slab Waterproofing

There are a number of options available for providing waterproofing to the basement slab. For example, the waterproofing membrane can often be extended underneath the slab using Oldroyd Xs and / or the slab waterproofed 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.

RIBA-Approved CPD Seminars

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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Brief description of proposed basement and end use.
External Waterproofing
New-build basement waterproofing
Primary Waterproofing
Primary basement waterproofing
Secondary Waterproofing
Secondary basement waterproofing
Internal Waterproofing
Internal Basement Waterproofing (Cavity Drain)
Download Datasheets
Vandex Super Flyer Vandex Super Waterproofer Vandex BB75
Vandex Super Flyer (248k) Vandex Super (26k) Vandex BB75 (28k)
Vandex Joint Solutions Cemelast Flyer Oldroyd New Basements
Vandex Joint Solutions Flyer (450k) Vandex Cemelast Flyer (394k) Oldroyd Exterior Walls (954k)
Oldroyd P fixing instructions. Oldroyd Interior Walls Price List
Oldroyd Xv fixing instructions (814k) Oldroyd Interior Walls (467k) Price List & Order Form (85k)
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[Click Here] to request a copy of any of these publications by post.

Technical Support

The following technical support features are available through this website:

To speak to a member of our technical team call 01403 210204 during office hours.

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