Exterior liquid waterproofing membrane

When a building’s envelope fails, everything inside is at risk. Exterior liquid waterproofing membranes eliminate the weak points that traditional systems leave behind — no joints, no overlaps, no failure points. MPM STARFLEX systems form a seamless, elastic barrier directly on the substrate, engineered to last in the harshest outdoor conditions.

Liquid vs. traditional waterproofing: why the gap matters

Sheet membranes and torch-applied systems have served the industry for decades. But they come with structural limitations: lap joints that can debond, rigid surfaces that crack under thermal movement, and installation constraints that slow down projects.

An exterior liquid waterproofing membrane works differently. It’s applied as a fluid, cures into a continuous elastic film, and adheres directly to any geometry — flat roofs, curved walls, complex junctions, penetrations. The result is full coverage with no joints to fail.

The right solution for complex geometries and demanding conditions

Liquid-applied systems are the professional choice when:

• The substrate has irregular geometry, multiple penetrations, or complex detailing
• The structure is exposed to significant thermal cycling or UV radiation
• Speed of installation matters and downtime must be minimised
• The surface is in poor condition, damp, or needs repair without full stripping
• The project demands certified, long-term performance with documented traceability

The result is complete coverage with no joints to fail, even where traditional systems cannot follow the substrate.

Where MPM exterior waterproofing systems perform

STARFLEX liquid membranes are specified across a wide range of exterior applications:

• flat and pitched roofs
• exposed terraces and balconies
• balconies under tile
• parking decks and ramps
• industrial roofing
• foundations and basements
• facades and external walls
• green roof build-ups

The system’s ability to conform to any geometry and adhere to virtually any substrate (concrete, bitumen, metal, PVC, tiles) makes it the reference solution across both new construction and renovation.

Why professionals across Europe choose MPM

MPM has been developing protective chemistry for the construction industry for over 70 years, with all products formulated and manufactured in Italy. The same R&D infrastructure — 5 laboratories, 210 certified products, more than 100 international certifications — that developed the STARFLEX range continues to test and evolve it.

STARFLEX systems carry ETA, BBA, CAM, REACH, and Broof (T4) fire rating certification, providing the full documentation package required for specification on regulated projects. Independently tested durability reaches 25 years, with select systems rated to 30. Beyond the product, MPM supports distributors and applicators with:

• pre-application consultation
• on-site technical assistance
• training

For projects with specific substrate conditions, climate constraints, or regulatory requirements, MPM’s technical team can develop custom formulations on request, working directly with engineers and distributors to engineer project-specific solutions.

Find the right system for your next project

Whether you’re specifying an exterior liquid waterproofing membrane for a new build, a complex refurbishment, or a large-scale industrial application — MPM’s technical team will identify the right STARFLEX system for your substrate, climate, and project requirements.