LeakBarrier MS300 Ice and Water Armor is a glass fiber reinforced, self-adhesive modified bituminous roofing underlayment for use under slate and asphalt shingles. Mineral granules on the upper surface provide enhanced skid resistant properties.
The emergence of specialty underlayment for residential roofing applications developed over many years. Various modified bitumens were developed in Europe in the 1960s and eventually manufactured in the United States in the 1980s. Ray Johnson details this progress in his article, "History and Development of Modified Bitumen."
Initially, modified bitumen membranes were intended for commercial roofing systems but, by the turn of the century, premium underlayment products made from modified bitumen were offered to residential roofing contractors.Read more
For many decades, asphalt-saturated organic felts went unchallenged as the underlayment material for residential roofing, despite having several weakness and drawbacks. These include not performing well as a secondary water barrier, being prone to degradation from UV exposure, easily tearing and an inability to be left exposed for long periods after installation.
Luckily, in the past twenty years, two completely new categories of roofing underlayments entered the steep-slope roofing marketplace, namely mod bits and synthetics. So what are the factors driving this change? Along with the issues of traditional asphalt-saturated felt, many industry and economic drivers have favored the introduction of new underlayment categories.Read more
Roofing contractors should know their materials inside and out. To fully understand underlayment one must know something about raw materials as well as manufacturing. Subtle variations at the molecular level have large effects on the properties of materials; furthermore, variations on the microscopic and macroscopic scales also affect performance.Read more
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