Oldroyd Gtx/ Gtx10/ Gtx20

The Oldroyd Gtx range consists of studded polypropylene cavity drainage membranes with a geotextile mesh welded to one side (often referred to as 'geocomposite membranes' or 'geocomposites'). 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. The geotextile mesh filters out the 'fines' in the groundwater, preventing them from causing blockages in other areas of the drainage system.

To be applied by a suitably qualified contractor.

Vertical applications:

• Waterproofing membrane: The Oldroyd Gtx range of membranes is 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.

• Protection layer: 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.

• Fin Drain: 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.

• Reservoir roofs

• Podium decks.

• Balconies.

Joint laps:

• Vertical joint: minimum 200 mm overlap is recommended; sealed with sealing rope.

• Horizontal joint: minimum 150 mm overlap is recommended; sealed with sealing rope.