Johns Manville Introduces New Roofing System at IRE Tradeshow

Johns Manville (JM), a leading supplier of commercial roofing products, adds to its already proven SeamFree® liquid roofing line with the introduction of the SeamFree™ PMMA Liquid Membrane roofing system. The new SeamFree™ PMMA Liquid Membrane roofing system debuts at the International Roofing Expo, and includes a full portfolio of PMMA-based products that combine to form a versatile membrane system for use in a variety of applications ideal for plaza decks, garden roofs, roofs with many penetrations, small roofs and irregular shaped roofs.

“We have taken notice of trends in the market,” said Mandy Schweitzer, Product Manager, Johns Manville. “The SeamFree™ PMMA Liquid Membrane roofing system is our answer to this shift in architecture and it is a product that can be paired with our SBS systems for flashings, balconies, and areas that are hard to reach with a traditional SBS roll. This product is part of JM’s commitment to creating valuable, progressive roofing solutions for our customers.”

The SeamFree™ PMMA Liquid Membrane System offers important advantages for roofing crews including:

  • Substrate Compatibility: Excellent adhesion to a variety of substrates including metal, wood, plastic, concrete, and asphalt.
  • Easy of Use: The two-part solid catalyst with liquid resin makes the product easy to mix and apply.
  • Quick and Versatile: The product can be applied in a broad range of temperatures (23ºF – 95ºF), is rainproof in 30 minutes and is fully-cured within 2-3 hours.

In addition to paving tiles, pedestal systems, and garden roofs, SeamFree™ PMMA can be surfaced with a variety of other aggregates, including roofing granules, and white or other roof coatings. The PMMA-based membrane is resistant to various chemicals, UV, ponding water and root penetration. The roofing system also includes a low VOC, exceptional low temperature performance and eligibility for up to a 20-year JM Peak Advantage Guarantee.

To learn more about the SeamFree™ PMMA Liquid Membrane System, please visit Additional system information will be available at International Roofing Expo: Booth #1119.

About Johns Manville

About Johns Manville

Johns Manville, a Berkshire Hathaway company (NYSE: BRK.A, BRK.B), is a leading manufacturer and marketer of premium-quality building and specialty products. In business since 1858, the Denver-based company has annual sales of approximately $2.5 billion and holds leadership positions in all of the key markets that it serves. Johns Manville employs approximately 7,000 people and operates 45 manufacturing facilities in North America, Europe and China. Additional information can be found at

Johns Manville Christina Martinez, 303-978-2858 Marketing Specialist