Oldroyd Gtx Range of Geotextile Cavity Drainage Membranes for Basement Waterproofing and Drainage Applications
The Oldroyd Gtx range consists of cavity drainage membranes with a geotextile mesh welded to one side (often referred to as 'geocomposite membranes' or 'geocomposites'). The geotextile mesh filters out the 'fines' in the groundwater, preventing them from causing blockages in other areas of the drainage system.
Product Range
The Oldroyd Gtx range consists of three geocomposite membranes with differing stud sizes, flow capacities, and compressive strengths:
| Membrane |
Stud Height |
Air Gap |
Compressive Strength |
| Gtx |
5mm |
3.5 l/m2 |
>400 kN/m2 |
| Gtx10 |
10.5mm |
8.69 l/m2 |
>700 kN/m2 |
| Gtx20 |
20mm |
15l/m2 |
>150 kN/m2 |
Each membrane in the Gtx range is manufactured from polypropylene, utilsing Oldroyd's multi-layer-technology to incorporate 49-70% recycled material with no loss of performance.
The non-woven geotextile layer is welded to the membranes ensuring that it will not easily separate and won't be subject to slippage during use.
Vertical Applications
The Oldroyd Gtx range of membranes are often used when waterproofing earth-retaining structures such as basements and retaining walls. In these situations they are applied externally and are therefore generally used only on newbuild projects. Other solutions are available for the basement refurbishment projects which can be applied internally.
Oldroyd Gtx membranes are usually used as a secondary drainage layer to protect a primary waterproofing system. When used in this way, Oldroyd Gtx membranes are effectively used to replace protection boards, but with the added advantage of diverting the majority of groundwater away from the primary waterproofing system - avoiding the need for drainage aggregates and allowing excavated soil to be reused as backfill. Suitable products for use as a primary waterproofing system include:
This "dual layer" approach lessens the stress put on the primary waterproofing system, reducing water ingress caused by possible imperfections in the application of the primary waterproofing system and / or structural movement.
Oldroyd Gtx membranes can also be used as ground pressure relief fin drains in civil engineering applications and as vertical edge drains around pavements and carriageways.
Horizontal Applications
The Oldroyd Gtx range of membranes can be used as horizontal drainage layers in a wide range of applications including:
- Green roofs
- Roof decks / terraces
- Paving
- Reservoir roofs
- Podium Decks
- Balconies
 Contains 49% (min) Recycled Plastic
The Oldroyd Gtx range of membranes contain a minimum of 49% recycled content as defined in section 7.8.1.1 of ISO 14021. Where quality and availability of recycled plastic allows, up to 70% recycled plastic may be used. By utilising Oldroyd's multi-layer technology this is achieved without any loss of product performance.
 NBS Clauses
Suggested NBS specification clauses: J30-80, J30-330, J40-70, J40-295, J40-380,
R16-380
Visit our NBS page for further information on specifying Safeguard products using NBS.
Safeguard currently offer the following RIBA-Approved CPD Seminars free-of-charge to architects and specifiers on the UK mainland:
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Oldroyd Gtx 
