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Protective and Durable Roofing Products With Specialty Minerals Ground Calcium Carbonates

Beautiful shingles enhance a home’s appearance and value, as well as providing necessary protection from the elements. Commercial and multi-unit residential buildings with flat or low-slope roofs also need the protection afforded by traditional asphalt roofing, or the newer thermoplastic olefin (TPO) or EPDM rubber roofing systems.

Ground calcium carbonates (GCCs), also called limestones, and ground dolomites, or calcium magnesium carbonates, contribute to the successful manufacture and installation of a variety of roofing products, while also improving their durability. These products include:

  • Asphalt roofing shingles
  • Asphalt fiberglass based roofing shingles
  • Asphalt shingle back surfacing
  • Roofing granules
  • TPO—thermoplastic olefin roofing membranes
  • EPDM rubber roofing systems
     

 

TPO - Thermoplastic Olefin Roofing Systems    
Thermoplastic olefin (TPO) single-ply roofing membranes are among the fastest-growing commercial roofing products, gaining broad industry acceptance for their many performance and installation advantages.  

Demand is increasing for heat-reflective and energy-efficient roofing systems. TPO single-ply roofing membranes answer those needs, also providing exceptional resistance to ultraviolet, ozone, and chemical exposure.


Specialty Minerals Calcium Carbonates for TPO Roofing
Smaller-particle-sized ground calcium carbonates and ground dolomites (calcium magnesium carbonates) are excellent fillers for the thermoplastic olefin resins used to manufacture the TPO roofing membranes. Suitable products from Specialty Minerals plants include:

  • Vicron® GCCs East – 3.5 to 10 micron high brightness ground calcium carbonates, manufactured in Adams, Massachusetts.

  • Vicron® GCCs West – 2.0 to 13 micron high brightness ground calcium carbonates, manufactured in Lucerne Valley, California.

  • Marblewhite® GCCs East – 200 and 325 mesh high brightness ground limestones from the Adams plant

  • Marblewhite® GCCs West – 125 to 325 mesh high brightness ground limestones from the Lucerne Valley plant

  • Dolocron® dolomites – 200 and 325 mesh, calcium magnesium carbonates with good brightness, manufactured in the SMI Canaan, Connecticut, plant.

Specialty Minerals Calcium Carbonates for EPDM Roofing Systems    
Durability, design versatility, and installation ease are among the many reasons EPDM is the most popular material for both new and reroof low-slope roofing applications. EPDM roofing systems are based on a synthetic rubber compound—a high-performance, ethylene-propylene diene terpolymer—that provides outstanding weathering characteristics in climates worldwide. EPDM roofing has long service life, having high resistance to thermal shock, UV, ozone, wind, hail, and abrasion.

Calcium carbonates of a medium fineness, in the 200 to 325 mesh range, are used for filling the EPDM rubber used for membrane manufacture. The Specialty Minerals ground limestones and dolomites recommended for EPDM roofing are:

  • Marblewhite® GCCs East – 200 and 325 mesh, high brightness ground limestones, produced in the SMI Adams, Massachusetts, plant.

  • Marblewhite® GCCs West – 125 to 325 mesh, high brightness ground limestones, manufactured in the SMI Lucerne Valley, California, plant.

  • Dolocron® dolomites – 200 and 325 mesh, calcium magnesium carbonates with good brightness, from the SMI Canaan, Connecticut, plant

All of Specialty Minerals GCC and dolomite plants are ISO 9001 quality-certified, and use stringent quality and process-control procedures to ensure the consistency and performance of the products.

Beauty and Quality: Asphalt Roofing Components Using Specialty Minerals Calcium Carbonates

Asphalt-based shingles have a long history of successful usage, and with the continuing development of new products—such as dimensional, architectural or laminate types—they remain popular choices for both entry-level and luxury housing. With the advent of the more steeply sloped roofs common on newer-style homes, the roof has become a major decorative element in its own right. It follows that the beautiful appearance added by today’s asphalt shingle products contributes to the overall appeal and value of a home.

 

Calcium carbonate plays a major role in the manufacture of these asphalt-based building components.

Asphalt Roofing Shingles and Rolled Roofing Products
Ground or pulverized limestone (calcium carbonate or GCC) or dolomite (calcium magnesium carbonate) is used extensively in asphalt roofing shingles, both fiberglass-reinforced and organic-mat-based, as well as in rolled roofing. These products have two primary functions. First, as fillers, ground calcium carbonates reduce cost by replacing a portion of the asphalt. Second, they improve the physical performance properties of the shingles. 

When choosing a calcium carbonate to use in asphalt shingles, manufacturers prefer grades that allow for optimal filler loading levels and process efficiencies. With a GCC with a top size of 20 mesh, with the minus 200 mesh content tightly controlled, limestone loading levels of 60 to 70% are achievable. Specialty Minerals products of this type are Vical® 5075, Eco-Cal® and Dolofil® 2055 ground carbonates.

Specialty Minerals produces two types of ground carbonate fillers to accommodate the range of shingle qualities manufactured. One type is high-performance engineered fillers, which maximize heat transfer; the second are economy grades for lower-end applications.

  • Marblewhite® GCCs East – 200 and 325 mesh ground calcium carbonates, produced in Adams, Massachusetts.

  • Marblewhite® GCCs West – 125, 200 and 325 mesh ground calcium carbonates, produced in Lucerne Valley, California.

  • ATF™ GCCs - bright screened limestones, in 10 to 40 mesh grades, manufactured in Adams, MA

  • Dolofil® 2055 dolomite – 20 mesh top size ground calcium magnesium carbonate, produced in Canaan, CT.

  • Vical® West GCCs –20 mesh top size limestones, from Lucerne  Valley, CA

  • Eco-Cal® GCCs – 40 mesh calcium carbonate produced during crushing and screening calcite ore at Adams, MA.

Asphalt Shingle-Back Surfacing
A fine mineral is dusted on the back, non-exposed shingle surface to prevent sticking. Silica has been used, but can be abrasive to the processing equipment. The preferred alternative is a ground limestone (calcium carbonate) or dolomite (calcium magnesium carbonate), both of which are far less abrasive and have low silica levels.

The Specialty Minerals  products recommended for shingle back dusting are:

  • Vical® West GCCs – 30 to 70 mesh, moderate brightness limestones from the SMI Lucerne Valley plant.

  • ATF™ GCCs- screened limestones, in 10 to 40 mesh grades, manufactured in Adams, MA.

  • DF™ dolomites – 10 and 20 mesh products, produced in Canaan, CT.

Roofing Granules
Limestone is sometimes used as a roofing granule in roofing systems. White crystalline limestone with sizing of 3/8” to 10 mesh can be used in the final coat for flat built-up residential roofing systems. The white limestone is selected for aesthetic considerations and higher reflectivity. For commercial applications, limestone aggregate can be imbedded into the bituminous surface to minimize weathering, provide melt resistance, and slow degradation of the roofing system.

Recommended Specialty Minerals products for roofing granules are:

  • ATF™ GCCs - screened limestones, in 10 to 40 mesh grades, manufactured in Adams, MA

  • DF™ dolomites - 10 and 20 mesh products, produced in Canaan, CT

  • High Calcium Grits GCCs - three larger particled limestones, from -¼” + 8 mesh to -1/4” + 30 mesh, from Lucerne Valley, CA

  • Vical® East GCCs - 20 mesh top size limestones, from Adams, MA

  • Vical® West GCCs - 20 mesh top size limestones, from Lucerne Valley, CA

  • Viroc® GCCs - two limestones, -½” +30 mesh  and -1”  +½” granules, manufactured in Lucerne Valley, CA

Custom Products
We are also able to design new products to meet the needs of your particular asphalt roofing application.  Contact us about your needs.

All Specialty Minerals ground limestone and ground dolomite plants are ISO 9001 quality certified.