BUILDINGS - Smarter Facilities Management

03/30/2015

Asphalt 101: Four Fast Facts

A crash course in bituminous roofing materials

By Richard L. Fricklas

 
  • Packaged asphalt

    Packaged asphalt

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    Asphalt packages provide type of asphalt, its equiviscous temperature that is recommended for heating, and a minimum flash point to avoid kettle fires.

    Packaged asphalt
  • Low fume

    Low fume

    /Portals/0/images/OnlineImages/2015/0415/rr/2-fume.jpg

    Consider low-fume asphalt if your building is already occupied – its lack of smell won’t bother occupants and complies with environmental requirements.

    Low fume
  • EVT

    EVT

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    Hot asphalt is typically applied with a setup like this.

    EVT
  • BUR layers

    BUR layers

    /Portals/0/images/OnlineImages/2015/0415/rr/4-layers.jpg

    Asphalt is a component in many roofing systems, including built-up roofing (BUR), so named for its alternating layers of asphalt and sheet reinforcements.

    BUR layers
  • Pitch Lake

    Pitch Lake

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    Pitch Lake in Trinidad, just off the coast of Venezuela, features natural asphalt.

    Pitch Lake

Asphalt has proved to be one of nature’s most useful and abundant materials since its discovery more than 5,000 years ago. This naturally occurring part of the environment is designated as part of the “bottom” of petroleum distillation and has been a popular roofing product since its introduction.

Whether you’re a longtime roofing professional or you’ve just had roofing added to your FM duties, there’s no time like the present to get up to speed on all things asphalt. Were you aware of these four asphalt facts?

1) It’s a component in many roofing systems.
As a soft material, it can be melted in the field, providing a high degree of waterproofing and retaining aggregate surfacings. The term “built-up-roofing” defines application of alternating layers of asphalt and sheet reinforcements.

Factory-applied asphalt can impregnate (saturate) organic or glass-fiber sheet reinforcements, and be used as underlayments for shingle-roof systems as well. Factory-applied mineral or ceramic roofing granules are solar-reflective and esthetically pleasing, and are used on both asphalt shingles and roll goods (cap sheets), on the top.

Modern applications blend polymeric materials such as atactic polypropylene and styrene butadiene styrene (APP and SBS) with selected asphalts to meet field conditions. The flexibility and toughness of MB blends make them useful for not only the membrane but for flashings as well.

Asphalt is also readily dissolved in petroleum solvents to form “cut-backs” as primers and roof coatings. It can be dispersed (emulsified) in water and clay particulates to make fire-resistive coatings.

2) It can be recycled – sometimes on-site.
The roofing industry has been recycling for more than a century. Original reinforcements were based upon collecting and shredding rags, hence the term “rag felt.” As clothing evolved into synthetic fibers which were not suitable for roofing, organic fibers such as newsprint and sawdust were successfully substituted and are still a viable roofing option. Both shingle underlayments (#15 felt) and asphalt shingles based upon either organic felt or glass fiber can be recycled.

Asphalt paving can be recycled in situ. Existing paving is ground up, blended with fresh hot asphalt, and replaced, allowing the road to be placed back in service in minutes.


Richard (Dick) L. Fricklas

Richard (Dick) L. Fricklas, received a Lifetime Achievement Award and fellowship from RCI in 2014 in recognition of his contributions to educating three generations of roofing professionals. A researcher, author, journalist, and educator, Fricklas retired as technical director emeritus of the Roofing Industry Educational Institute in 1996. He is co-author of The Manual of Low Slope Roofing Systems (now in its fourth edition) and taught roofing seminars at the University of Wisconsin, in addition to helping develop RCI curricula. His honors include the Outstanding Educator Award from RCI, William C. Cullen Award and Walter C. Voss Award from ASTM, the J. A. Piper Award from NRCA, and the James Q. McCawley Award from the MRCA. Dick holds honorary memberships in both ASTM and RCI Inc.

3) Low-emitting asphalts exist.
Roofing asphalts have been engineered to be low-fuming, an important consideration when a building is occupied while reroofing takes place. Modified bituminous roof membranes that incorporate atactic polypropylene offer greater flexibility and ductility than unmodified membranes.

4) Trade associations can teach you more.
The Asphalt Roofing Manufacturing Association (ARMA) is celebrating its 100th anniversary in 2015. This organization has brought the industry together under the common goal of championing asphalt roofing and it is estimated that almost 95% of the nation’s manufacturers of bituminous-based roofing products are members. To learn more about asphalt roofing, visit ARMA at www.asphaltroofing.org.

Why Asphalt? Why Now?
How a tried and true roofing system remains a top contender.

The ABCs of Roof Fire Ratings
Does your roof meet code and insurance requirements?

How to Preserve Thermoplastic Roofs
Patch a weldable membrane in 8 steps.

 

 

 


 
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