Delta PT is a high-performance polyethylene membrane used to insulate and isolate damp and contaminated walls, vaults, and basements.

Delta PT is manufactured with 8mm extruded studs that create a continuous air gap. This results in a watertight, temperature and chemical-resistant seal.

The 8mm stud design of Delta PT provides a continuous air gap which serves two purposes. It isolates the damp wall from new plaster and decorative finishes, and it allows ventilation of the wall for permanent damp control.

Ventilation can be achieved by using the Delta PT profile or the air gap can be vented externally via passive air vents.

On the face of the membrane, a welded mesh allows plasters and renders to bond efficiently to achieve dry and durable finishes.

Delta PT is watertight, resistant to high and low temperature extremes, chemically resistant to acids, alkalis, oil and solvents and is approved for use in drinking water applications.

Features, benefits and applications

  • Type C Drained Protection in accordance with BS 8102:2022, Protection of below ground structures against water ingress. Code of practice.

  • BBA Approved

  • A reversible system, which will minimize damage to historical or heritage structures

  • Virgin high density polyethylene studded/moulded sheet (HDPE)

  • An effective barrier to the transmission of salts, liquid water and water vapour

  • Available in 2 stud heights

  • Resistant to chemicals, root penetration, rot proof, neutral towards drinking water

  • Suitable for Flood Resilience

  • Resistant to Carbon Dioxide, Radon and Methane

  • Neutral towards drinking water

  • Available in 3 stud heights: 8mm, 7mm and 4mm.

Depending on the application required and the site conditions, the membrane may be used as:

  • a dry lining for walls, ventilated into the room via aeration slots at the top and bottom of the wall or via passive air vents, where access through an external wall is available

  • a sealed system covering wall, floor and ceiling with provision made for disposing of water build-up behind the membrane via a sump and pump

It can support plastering, rendering or a dry lining fixed by plaster dabs (where appropriate) in the following situations:

  • on damp walls in underground situations subject to high groundwater levels, and perennial moisture

  • on vaulted ceilings of archways or cellars subject to water ingress

  • in conjunction with a remedial dpc system where the walls have a high salt content, and/or it is necessary to complete the installation immediately without allowing a period for initial drying

  • over walls which have a friable or painted surface, are contaminated with oil or mould, or have a high salt content

  • as a waterproofing membrane in areas subject to vibration

Product details

  • Product Code: DMS 001/ DMS 002

  • Material: High Density Polyethylene (HDPE)

  • Sheet Thickness: 0.5mm

  • Stud Height: 8 mm

  • Roll Size: 2.0 x 20m/ 1.5 x 10m

  • Compressive Strength: 70 kN/M²

  • Drainage Capacity: 5 L/S M, 300 L/MIN M, 18 100 L/H M

  • Void between studs: 5.5 l/m²

  • Temperature Resistance: -30°C to +80°C

  • Behaviour of Fire: Class E