Delta PT is a high-density polyethylene (HDPE) cavity drainage membrane designed for internal damp proofing and basement waterproofing. It iss an 8mm studded Type C, Cavity Drainage Membrane that is suitable for use in basement waterproofing for new and existing structures. Featuring an integrated plastic mesh heat welded to the dimpled surface, Delta PT provides a secure mechanical key for direct application of plaster, render, or shotcrete—making it ideal for walls, ceilings, tunnels, and below-ground structures.
As a Type C waterproofing system (in line with BS 8102:2009), Delta PT forms part of a drained protection strategy, managing water ingress behind the membrane and diverting it safely to drainage or sump pump systems.
Key Features
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✅ BS 8102:2009 Compliant – Classified as a Type C Drained Protection System
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✅ BBA Approved – Independently assessed and certified for performance and durability
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✅ Mesh-Faced Surface – Supports direct plastering, rendering, or shotcrete
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✅ Reversible & Non-Invasive – Ideal for heritage buildings where minimal intervention is required
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✅ Salt and Vapour Barrier – Blocks water, vapour, and salt transmission
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✅ Chemical, Rot & Root Resistant – Withstands aggressive environments
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✅ Flood Resilient – Suitable for flood zones and high groundwater locations
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✅ Radon, Methane, CO₂ Resistant – Suitable for contaminated ground conditions
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✅ Drinking Water Neutral – Safe for use in contact with potable water systems
Recommended Applications
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Internal damp proofing and remedial waterproofing of basements
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Tunnel and vault protection in infrastructure and heritage structures
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High salt-content walls requiring immediate intervention
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Surfaces contaminated by oil, mould, or paint
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Dry lining or plastered finishes, applied with dabs or directly rendered
Installation Options
Depending on site conditions, Delta PT can be installed as:
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Dry Lining System
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Fixed to walls with passive ventilation via aeration slots or vents
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Allows for air circulation behind the membrane
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Fully Sealed System
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Encloses walls, floors, and ceilings
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Directs water to a sump and pump drainage system
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