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Hydrostop EU AH-25

Innovative single component liquid waterproofing system which offers significant advantages over conventional systems, for use on flat and pitched roofs with limited access, including green roof and roof garden specifications. It is fully reinforced with a polyester fleece membrane and can be applied under practically any conditions, including cold days above 0°C and on moist surfaces (7% or less). Hydrostop EU AH-25 is fast-curing and easy to apply; its superior performance makes it ideal for any small scale, large commercial, new build or refurbishment projects. Based on alpha-hybrid, silane terminated polyether technology.

Features/ Benefits:

  • Cost effective on wet-on-wet system.
  • Water repellent on application.
  • Non-hazardous - low odour, no solvents, isocyanurate free.
  • Ready to use, single liquid component.
  • No wastage - product can be stored and reused.
  • Cold applied - no heat or flame.
  • Fully reinforced with polyester fabric.
  • Ideal for complex detailing.
  • Excellent elasticity and tensile strength.

General information


Silane terminated polyether

Uniclass 2015

Pr_35_31_68_64 Polyurethane (PUR) waterproof coatingsPrimary


J31/10 Warm deck roof coating

J31/110 Cold deck roof coating

J31/120 Warm deck roof coating

J31/130 Inverted roof coating

J31/353 Waterproof coating

J31/5 Cold deck roof coating

Specification data - Polyurethane (PUR) waterproof coatings

Product Reference

Hydrostop EU AH-25

Standard product features


Silane terminated polyether.



Reinforcement weight:

110 g/m².

Reaction to fire (to BS EN 13501):

Class E.

Third party certifications