Polymer-modified asphalt bitumen roof systems have been
installed in the U.S. for more than three decades and matured into
reliable, popular low-slope roof systems. These systems have
evolved from two types of polymer-modified asphalts: APP polymers
that give the material a "plasticized" characteristic and SBS
polymers that give the material a "rubberized" quality.
Manufacturers have developed hot-applied, cold-applied,
torch-applied and even hot-air welded polymer-modified bitumen roof
Following is information about an emerging fully adhered
modified bitumen system technology—self-adhered modified
Self-adhering polymer-modified bitumen roof systems do not
require liquid or viscous materials to activate adhesive properties
and attach to a surface; the adhesive properties improve as the
ambient temperature rises. However, several manufacturers'
published guidelines also state maximum allowable temperature
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