June 2002

Some like it cold; some like it hot

Some like it cold; some like it hot 4.3 stars4.3 stars4.3 stars4.3 stars4.3 stars

Advantages of certain application methods for modified bitumen systems

by Tim Kersey
Be the first to comment

According to NRCA's 2001-02 Low-Slope Roofing Materials Guide, there are more than 400 modified bitumen sheets available in the United States from at least 31 manufacturers/suppliers. The resulting number of potential membrane combinations is staggering—after selecting a supplier and membrane, a choice still must be made as to the most appropriate method of installation. There are more options than ever for adhering modified bitumen sheet materials, including hot asphalt, heat welding or torching, liquid cold adhesive, self-adhesive and mechanical fastening with a heat-welded overlap.

Following is some information about the benefits and drawbacks of these installation methods. Because self-adhered and mechanically fastened roof systems have relatively small market presences, they will not be addressed at length.


When SBS-modified bitumen products were introduced in the United States during the late 1970s, a majority of U.S. roofing contractors were installing built-up roof systems. Familiarity and practicality of using existing equipment made installing SBS-modified bitumen membranes using hot asphalt an easy choice. However, in the years since, laboratory testing and field experience have demonstrated that other interply bonding choices—solvent-based adhesives, heat welding and heat-activated self-adhesives—offer...

To read the article in its entirety, please log in or register (registration is free).

Log in or register for FREE access to this article and other Professional Roofing online content.

Not a professionalroofing.net user?

Register now for free access
  • Full access to every article
  • Online Web exclusive information
  • Photo gallery
  • Breaking news
  • Online classified ads

Already a professionalroofing.net user?

Log in now

User name:



Login help
Click here to have your user name and password emailed to you.

Comments (0) Login to post a comment or rating
There are no comments posted.