Spotlight on Johns Manville APP Membrane Roofing


As we continue our focus on Johns Manville (JM) commercial membrane roofing systems in our commercial roofing systems series, we are spotlighting their APP membrane roofing (previous posts covered their EPDM , TPO , PVC  and SBS  membrane roofing solutions). We’ll wrap up our JM membrane roofing posts with more about their BUR and liquid applied membrane roofing options. The Single Ply Roofing Industry writes, “APP membranes are constructed with bitumen that has been modified with plastic Atactic Polypropylene (APP) polymers, resulting in a coating with the highest temperature range and enhanced durability and toughness.” Roofing Contractor reports APP membrane roofing systems offer “good damage resistance due to their multi-ply construction, the strength of the modified bitumen sheet, and the damage protection provided by the granular surface.” Let’s learn more about this type of roofing as we go through its features and benefits.


Basics and Benefits
What is APP membrane roofing? Ray Corbin for Roofing Contractor explains: “APP (Atactic Polypropolyene) ‘plastic’ modifier additive is combined with the asphalt to provide a tougher, better weathering asphalt coating.” Johns Manville describes APP as “tough and economical like a thermoplastic, with the proven waterproofing of asphalt.” Benefits of APP membrane roofing include:

  • Roofing Contractor emphasizes two main APP benefits, their “excellent weathering and fire-resistant properties” without the use of a heavy gravel cover
  • Another plus is having flexibility in application options (hot asphalt, heat welding and cold adhesive)
  • Johns Manville emphasizes the tremendous strength of their APP systems
  • You can look to APP roofing to provide waterproofing protection
  • Another benefit to note is the cost-effectiveness of APP solutions


Installation and Options

Roofing Contractor reports “APP products are designed to be heat welded.” In this process, a blend of modifiers come into play to handle a broader range of temperatures. You’ll note cold applied and adhered application methods are also an option depending on the APP products used and the considerations of your project. As always, quality installation makes all the difference. Look to our full-service commercial roofing department at Bone Dry Roofing Company to excel at an array of roofing projects (any size and complexity). Take a look at our project gallery and bios to review our qualifications and experience. We would love the opportunity to handle your roofing needs!

Application Methods

  • Cold applied
  • Heat weldable
  • Adhered


Products and Accessories

The Bone Dry team will carefully review your project specifics before recommending the best products and accessories for the job. JM Membranes include APPeX 4.5M, APPeX 4.5M CR G, APPeX 4.5M FR, APPeX 4.5M FR CR G, APPeX 4S, APPeX 4S Embossed and more (full list on the JM website). Accessories include CR Roofing Granules for high reflectivity and durability and Granules to boost long-term adhesion.


Make sure you partner with the best roofing company in your area. Bone Dry Roofing, locally owned and operated in Charleston, SC, Bone Dry Roofing, locally owned and operated in St. Simons, Bone Dry Roofing, locally owned and operated in Athens, GA. You can contact us today to discuss your APP membrane roofing needs at 1-855-BONEDRY.

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