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
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