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SOPREMA’s ALSAN Coatings Line Extends Roof’s Lifespan

Photos courtesy of SOPREMA

SOPREMA, Inc., a leading manufacturer of commercial building envelope materials, 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 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 the direct sunlight on a black roof have been proven to shorten the life of a roof and increase cooling costs for the building owners. Coatings, such as ALSAN, 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 ultraviolet (UV) rays
  • Reduces energy consumption and expenses
  • Extends the life of the existing leak-free roof
  • Offers compatibility with many substrates
  • Is environmentally safe and friendly and 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-volatile organic compound (VOC), high-solids, single-component silicone roof coating offering UV protection and resistance to standing water. Meanwhile, the AC 401 is a plasticizer-free, water-borne, acrylic elastomeric roof coating offering 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 built-up roofs (BURs), 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, silicone caulk, and butyl fleece tape.

SUCCESS STORY: Potomac Transportation Center

To stay proactive, the Potomac Transportation Center (Dumfries, Va.), part of the Prince William County Public Schools, decided to apply a protective coating to their building. Although there were no immediate problems with the current roof, it was determined that a preventative coating was needed on the aging roof before future complications arose. When it came time to select products for this job, the ALSAN Coating line was selected due to SOPREMA’s relationship with Northeast Contracting Corporation, the local expert field technical services team. 

To ensure the current roofing material was appropriately prepared for the new system, ALSAN All Purpose Cleaner was used to provide a clean start. Next, a layer of ALSAN Coating Rust Inhibitive Primer was applied to enhance the adhesion of the coating layers to come. ALSAN Coating SIL 402 Flashing and ALSAN Coating SIL 402 were then installed to complete the project. Once cured, these products provided the Potomac Transportation Center with a clean, durable, weatherproof coating that is highly reflective and resistant to UV and natural weather degradation, resulting in a long-lasting maintenance coating.

SOPREMA offers a comprehensive line of roofing, waterproofing, wall protection, 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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