Exposed waterproofing membranes, particularly at vulnerable turn-ups and penetrations, face constant UV attack. Without protection, their performance degrades, leading to premature failure. SILCOR Top Coat 75 provides that essential UV shield and a durable, foot-trafficable finish, ensuring underlying SILCOR membrane systems remain intact and functional for the long term.

Why this product exists

SILCOR Top Coat 75 was engineered to extend the service life of SILCOR liquid-applied waterproofing membranes in exposed conditions. It functions as a two-part, aliphatic polyurethane coating applied over the membrane, specifically formulated to resist UV degradation and provide a durable, non-slip surface. This allows SILCOR membranes to be used in areas traditionally problematic for exposed waterproofing, including plant room roofs, balconies, and critical flashing details.

The numbers that matter

  • Excellent UV Resistance: The primary job of SILCOR Top Coat 75 is to block UV radiation. This “excellent” rating ensures the underlying SILCOR membrane system is protected from chalking, embrittlement, and premature failure, preserving its long-term integrity.
  • Shore Hardness 75-80°A: This high Shore hardness rating indicates a tough, durable finish. It translates directly to resistance against indentation and abrasion from regular foot traffic, maintaining a resilient surface on roofs and balconies.
  • Drying Time 2 hours @ 25ºC: A rapid drying time means quicker access for follow-on trades. This minimises project downtime and allows for a faster return to service, an advantage in busy construction schedules.
  • UL Class A Fire Resistance: This fire rating is critical for safety and compliance on exposed roof areas, especially plant rooms. It provides an additional layer of protection, addressing an essential safety requirement for commercial applications.

What it's like to use

Application begins with ensuring the SILCOR membrane surface is clean and dry. SILCOR Top Coat 75 is a two-part system, requiring thorough mixing of the Resin and Hardener components at a 5:1 ratio by weight. A high-speed dissolver for 5 minutes ensures a homogeneous blend. Application is typically in two coats using a brush or roller, with the second coat applied in a cross-direction to ensure uniform coverage and finish. For larger areas, it can also be sprayed in a single wet-on-wet application. Clean-up of tools and spills before curing is achieved with MULTITEK Xylene or methylated spirits.

Where this product excels

  • Plant Room and Lift Motor Room Roofs: Provides essential UV and foot traffic protection, ensuring the underlying SILCOR waterproofing on these critical, often-accessed areas remains intact and compliant.
  • Balconies and Decks: Delivers a durable, non-slip, and colour-fast finish, protecting the waterproofing membrane from direct sunlight and light foot traffic while maintaining aesthetic appeal.
  • Perimeter Turn-ups, Penetrations, Sill or Window Flashings: Safeguards these vulnerable detailing points from UV degradation, ensuring the long-term flexibility and integrity of the waterproofing system where it transitions.

How it fits in a real system

SILCOR Top Coat 75 is the final, protective layer in an exposed SILCOR waterproofing system. It is specifically designed for application over all grades of SILCOR waterproof membranes, including SILCOR 575 LB, enabling these membranes to perform reliably in direct sunlight. This top coat shields the membrane from UV radiation and provides a durable, foot-trafficable surface. If future finishes like tiles or paint are required over the top coat, the surface first needs sealing with a compatible primer like SILCOR Primer BW Grey or EPOCOTE F100W Grey.

Choose this when

  • When protecting exposed SILCOR membrane systems: Use SILCOR Top Coat 75 to shield your SILCOR waterproofing membrane from UV degradation on roofs, balconies, and other external areas.
  • When a foot-trafficable finish is required: Specify this coating for areas like plant room roofs or decks where regular access is needed, ensuring durability and preventing wear to the membrane.
  • When non-slip properties are critical: Apply this product to enhance safety on exposed surfaces that may be subject to foot traffic and environmental conditions.
  • When long-term colour stability is desired: Choose this coating for a colour-fast protective layer that maintains its appearance over time in exposed situations.

Don't use this when

  • Not for: Acting as a primary waterproofing membrane. SILCOR Top Coat 75 is a protective coating designed to go over a waterproof membrane, not replace it.
  • Not for: Application over non-SILCOR waterproofing membranes. This product is formulated specifically for compatibility and optimal performance with the SILCOR system.
  • Not for: Projects requiring a single-component product. SILCOR Top Coat 75 is a two-part system that requires careful mixing prior to application.

The UL Class A fire resistance rating provides critical assurance for safety in exposed building areas, particularly on roofs, meeting stringent fire performance standards. This contributes to the overall compliance and safety of the complete waterproofing system.