Delta MS 500 Fire Cavity Drain Membrane

Delta MS 500 Fire Cavity Drain Membrane

Delta MS 500 Fire Retardant is a new 8mm studded Type C, Cavity Drainage Membrane that has been manufactured with DELTASAFE, a new innovative fire-retardant property which enables Delta MS 500 Fire Retardant to  achieve a Euroclass rating of B-S2, d0 in accordance with EN 13501-1:2018.

This Fire-retardant High-Density Polyethylene  (HDPE) cavity drainage membrane has an 8mm studded clear profile. Suitable for use on  the internal faces of walls and floors as a water management system for the protection of  below ground structures against the potentially adverse effects of ground water ingress.

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Delta MS 500 Fire Retardant
  • Euroclass rating: B-S2, d0 in accordance with EN
  • Type C Drained Protection in accordance with BS 8102:2022
  • Suitable for waterproofing and damp proofing
  • Suitable for new, existing and retrofit basement projects
  • Flexibility to cope in structures where movement or vibration can be problematic
  • A “reversible” system, which will minimise 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
  • Resistant to chemicals, root penetration, rot proof, neutral towards drinking water
  • Suitable for Flood Resilience
  • Resistant to Carbon Dioxide, Radon and Methane

It can support a dry lining, screed or flooring, in the following situations:

  • on damp walls and floors 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 and floors have a high salt content, and/or it is necessary to complete the installation immediately without allowing a period for initial drying
  • over walls and floors which have a friable or painted surface, are contaminated (eg with oil or mould), or have a high salt content
  • as a structural waterproofing membrane in areas subject to vibration.
Product Details
Delta MS 500 Fire Retardant
Product Code:
DMS 850
High Density Polyethylene (HDPE) with DELTASAFE
Sheet Thickness:
Stud Height:
Roll Size:
2.4m x 20m
Compressive Strength:
>250 kN/M²
Drainage Capacity:
2.25 L/S M
135 L/MIN M
8 100 L/H M
Air volume Between Studs:
5.3 L/M²
Temperature Resistance:
-30°C to +80°C
Reaction to Fire:
EN 13501-1:2018 Class B-S2, d0
R Value:
0.12 M² K/W
Delta MS 500 Fire Retardant
  • NBS Specification J40 (Clause 290) Flexible Sheet Tanking/Damp proofing.
  • BS 8102:2022, Protection of below ground structures against water ingress. Code of practice.
Technical Drawings

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