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SOPREMA’s Roof Coatings Products Offer Durable Solutions Packed With Additional Benefits

Photos courtesy of SOPREMA

SOPREMA, Inc., a leading manufacturer of total solutions for building envelopes, produces commercial roof coating products for various applications, including asphaltic modified bitumen, built-up roof (BUR), and metal roofing systems. SOPREMA's roofing coatings are durable and waterproof and they provide excellent adhesion.

SOPREMA products encompass the full range of commercial roof coating needs — from primers that block bleed-through and low volatile organic compount (VOC) options, to silicone roof coatings for low-slope applications and rust-inhibitive acrylic roof coating. SOPREMA products create a protective barrier for architectural surfaces and substrates.

ALSAN Coatings

SOPREMA has a complete collection of silicone and acrylic products applicable to many roofing systems. The ALSAN Coatings line is designed to maintain and extend the lifespan of existing roofs by adding a protective layer to the current system. The coating layer accomplishes this by protecting the underlying membranes from weathering and it can reduce rooftop temperatures. 

The ALSAN Coatings product line consists of two coating options: silicone and acrylic. The ALSAN line is complete with flashing details, primers, and accessory products designed to prepare the surface and enhance adhesion. The effects of direct sunlight on a black roof have been proven to shorten the life of the roof and increase cooling costs for the building owners. Coatings, such as ALSAN Coatings, can help extend a roof's lifespan by applying a reflective layer to the existing system.


  • Reduces rooftop temperatures and prevents premature aging caused by UV rays
  • Reduces energy consumption and expenses
  • Extends the life of the existing leak-free roof
  • Compatible with many substrates
  • Environmentally safe and friendly
  • Economically priced

*ALSAN Coatings can also be tinted in a variety of colors. However, darker colors will reduce the coating's effectiveness of the above-listed benefits.

Under the ALSAN brand name are the ALSAN Coating SIL 402 and the ALSAN Coating AC 401.

The SIL 402 is a low-VOC, high-solids, single-component silicone roof coating offering ultraviolet (UV) protection and resistance to standing water. Meanwhile, the AC 401 is a plasticizer-free, water-borne, acrylic elastomeric roof coating offering various properties including high reflectivity, flexibility, and resistance to natural weathering. Each is available in white and custom colors.

Both coatings can be applied over existing single-ply, modified bitumen, BUR, metal roofing systems, and/or approved existing coatings. Designed to prevent asphalt bleed-through, inhibit rust, and promote adhesion, these products are supported by primer options that allow use across numerous roofing materials.

Additional accessories include an all-purpose cleaner, Polyfleece polyester fabric for reinforcing seams and flashing, walkway coatings/granules, and silicone caulk and butyl fleece tape.

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ALSAN RS offers a complete range of high-performance, flexible, seamless, polyester-reinforced liquid-applied polymeric roofing solutions. ALSAN RS is composed of polymethyl methacrylate (PMMA)- and polymethacrylate (PMA)-based resins that offer rapid set times and results in a resilient roof requiring minimal maintenance.

Liquid-applied systems offer alternatives to conventional roofing methods, eliminating the safety risks associated with adhesives, torches, and hotapplied systems. The single coat application technique also makes ALSAN RS a time- and cost-effective solution.


  • Rapid-setting and easy application
  • VOC compliant
  • Tough polyester reinforcement
  • Cool roof solution
  • Low maintenance


ALSAN RS fully reinforced systems can be used over existing roofs as a recovery system to extend the life of the existing roof installation, limiting the need for tear off. ALSAN RS systems provide a seamless, monolithic seal for a watertight finish. This method provides long-term, cost-effective protection against moisture infiltration and other damage.

Flatiron Building
New York City, New York

The world-famous Flatiron Building in New York City is protected by SOPREMA. In the dead of winter, with temperatures below freezing, ALSAN RS created an impenetrable liquid-applied waterproofing membrane guaranteed for 20 years. SOPREMA’s state-of-the-art polymethyl methacrylate liquid-applied waterproofing technology was used to completely waterproof the 8,500-square-foot main roof and 21st floor set in the back of the building. 

The work was completed in difficult circumstances, with below freezing temperatures (25 °F) and windy conditions. The main roof was a recovery application, which saved Newmark Knight Frank, the building’s owner, the costly process of tearing off the aged granulated surfaced SBS membrane. ALSAN RS was applied directly over the existing membrane, creating a watertight surface. Of special interest was the time saved on numerous skylights and other difficult flashing challenges, including penetrations, bulkheads, and chimneys, many with peculiar angles due to the building’s unique architecture.

SOPREMA offers a comprehensive line of commercial roofing, waterproofing, wall protection, soundproofing, and civil engineering solutions, combining superior products and systems with decades of proven performance. Our solutions include industry-leading SBS-modified bitumen membranes, polymeric PMMA/PMA liquid-applied membranes and synthetic single-ply PVC membranes. 

For applications as diverse as roofing, below-grade waterproofing, plaza deck and balcony waterproofing, air and vapor barriers, and bridge and parking structures, SOPREMA has the solution. SOPREMA's relentless pursuit of technological advancement, sustainability, and product quality has been known and respected worldwide for more than 100 years.

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