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Cold Applied Liquid Waterproofing

Caltech QC

The Caltech QC range comprises cold applied, reinforced PMMA waterproofing systems for roofs, balconies, terraces and walkways. The wet-on-wet application process incorporates polyester fleece reinforcement, reducing installation time and the risk of inter-coat contamination.

The range includes primers, air and vapour control layers (AVCL), warm and non-combustible thermal insulation options, and ancillary components.

The range includes:

  • Caltech QC Resin, for flat roofs, podium decks, terraces and applications beneath green roof systems and hard landscaping finishes.
  • Caltech Coating, for cantilevered walkways, balconies and terraces or over unoccupied space and subjected to high mechanical loads.
  • Caltech Balcony Plus, for exposed pedestrian environments, including balconies, terraces and access walkways, providing a hard-wearing, decorative and trafficable finish.
  • Cold-applied, no hot works
  • Fast-curing, catalyst-controlled technology
  • Self-terminating detailing
  • Can be used to designed zero and absolute zero falls

The Caltech QC range features a catalyst-controlled cure to form a seamless, fully bonded membrane that simplifies installation while providing crack-bridging performance, rapid curing and durable protection. The liquid-applied formulation can be applied by roller or brush, forming a self-terminating membrane that allows efficient detailing around vertical upstands, penetrations and complex junctions without the need for mechanical termination bars. Caltech QC is suitable for a wide range of roofing applications and can be integrated with other Alumasc waterproofing systems to facilitate the waterproofing of complex details, transitions and interfaces.

Available with a range of decorative, textured and anti-slip finishes, the Caltech QC Balcony Plus system can be tailored to meet project-specific aesthetic, durability and slip-resistance requirements.

  • New build
  • Refurbishment
  • Cold roofs
  • Warm roofs
  • Inverted roofs
  • Balconies and Terraces
  • Walkways
  • Overlay of existing waterproofing systems
  • BBA Certificate No. 17/5392
  • Environmental Product Declarations (EPDs) available
  • Classified as BROOF(t4) to BS EN 13501-5 within approved and tested system assemblies
  • Members of the Liquid Roofing & Waterproofing Association

Alumasc provides a comprehensive range of single-source warranties for Caltech QC, offering coverage for up to 25 years. Installed exclusively by Registered Contractors and underpinned by our extensive project support service, these warranties cover product, workmanship, and design.

BBA Certificates

  • BBA (17/5392) Caltech QCDownload
  • BBA (17/5392) Caltech QC Balcony & WalkwayDownload
  • BBA (17/5392) Caltech QC DetailDownload

CAD Details

Product Data Sheets

Safety Data Sheets

System Summaries

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For project enquiries, general guidance, or pricing requests, please contact us via email or phone. Our team is here to help!

Our Service

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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