Hot Melt Waterproofing

Hydrotech MM6125

Hydrotech MM6125 is the UK’s leading structural waterproofing system and has been trusted by architects and specifiers for more than 60 years. Designed for use on inverted roofs, podium decks, green roofs, blue roofs, and parking decks, it combines a hot melt rubberised bitumen membrane with a polyester reinforcement and a protection sheet to create a seamless, flexible monolithic waterproofing system engineered to last the lifetime of the building.

The range includes inverted and non-combustible thermal insulation options, a water flow reducing layer (WFRL), bituminous protection sheets, ancillary components, and inverted roof finishes.

  • Designed to last the lifetime of the building
  • Contains 30% recycled content
  • Can be used to designed zero (0° - 1:80) and absolute zero falls (0°)
  • Accommodates structural movement

Hydrotech MM6125 characteristics

Hydrotech MM6125 is a one-part, 100% solids, liquid applied thermoplastic waterproofing membrane designed to deliver a robust and reliable monolithic finish with no seams or joints. Polymer modified, and formulated with 30% recycled content, it supports sustainable construction objectives while offering certified dynamic crack-bridging capabilities to accommodate structural movement throughout the building’s life cycle. Its versatility allows it to be incorporated into zero and absolute zero falls designs and makes it well suited to projects requiring phased construction. With a proven track record of long-term durability, Hydrotech MM6125 contributes to an extended service life of the roof system.

  • New build
  • Inverted roofs
  • Cold roofs
  • Podium decks
  • Parking decks
  • Buried membrane applications
  • Submerged applications
  • Ideally suited to concrete and timber substrates
  • BBA Certificate No. 90/2431
  • ETA Certificate No. 20/0907
  • Environmental Product Declaration (EPD) available
  • When incorporated within protected roof finishes recognised by European Commission Decision 2000/553/EC, or beneath compliant green roof systems designed in accordance with the DCLG Fire Performance of Green Roofs and Walls guidance and GRO Code of Best Practice recommendations, the requirement for external fire performance classification BROOF(t4) is deemed to be satisfied
  • Members of the Liquid Roofing & Waterproofing Association

Alumasc provides a comprehensive range of single-source warranties for Hydrotech MM6125, offering coverage for up to 40 years. Installed exclusively by Registered Contractors and underpinned by our extensive project support service, these warranties cover product, workmanship, and design.

BBA Certificates

  • BBA (90/2431) Hydrotech MM6125Download
  • BBA (90/2431) Bluroof Monolithic Membrane 6125Download

CAD Details

Product Data Sheets

Safety Data Sheets

System Summaries

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Enhance every roofing project with tailored expertise designed to minimise risk and maximise long-term performance. Our team supports you from initial design through to installation and aftercare, providing sustainable, reliable solutions for both new build and refurbishment projects.

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