Belzona 3211 | Lagseal Membrane | Weather and Waterproofing Systems

Introducing Belzona 3211 (Lagseal), our high-performance industrial coating designed to protect all types of thermal insulation and cladding systems. Incorporating a polymer bonded glass reinforcing sheet (Belzona 9321), this water-based acrylic emulsion membrane is perfect for providing seamless, flexible protection.

Our epoxy coating is heat-resistant and can withstand high temperatures, making it an excellent anti-corrosion coating for steel. Its microporous nature allows trapped moisture from within the insulation to evaporate, while providing protection from water ingress.

Belzona 3211 (Lagseal) is a solvent-free, single pack system that requires no mixing, making it simple to apply to damp or dry insulation. This industrial coating is water, weather, and fire resistant and conforms to the requirements for a ‘Class O’ surface for ‘The UK Building Regulations 1991’ and ‘Class A’ in accordance with ‘ASTM E84’. Trust our high-temperature epoxy coating for effective corrosion protection.

Key Benefits:

  • Fire resistant
  • Easily applied by brush with no mixing required
  • Reduced health and safety risks as it is solvent-free
  • Application and cure at cold temperature - no hot work involved
  • Will not support growth of bacteria or algae  providing a hygienic finish
  • Excellent oil resistance
  • Withstands movement due to temperature fluctuations and vibrations within the system
  • Resistant to water, steam impingement, infra-red and ultra-violet radiation
  • Excellent adhesion to a wide range of materials including calcium silicate, glass fibre, mineral wool, foam, steel and stainless steel

Applications of Belzona 3211 | Epoxy Coating | Lagseal:

  • Protection of insulation on pipes, air-conditioning ducting, valve boxes, flange covers, boilers, pressure vessels, bulk storage tanks and heat exchangers
  • Long-term lagging protection on new and existing steam, condensate or chilled pipelines
  • Seamless encapsulation of elbows, T pieces flanges and complex contours 
  • Tank base sealing

About the Brand:

Belzona specializes in high-performance industrial coatings, repair composites, and maintenance materials, catering to sectors like oil and gas, power, and mining. Their 60+ years in business emphasize durable, easy-to-apply solutions to enhance machinery lifespan, reduce downtime, and cut maintenance costs.


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