Installing spray polyurethane foam (SPF) -based roof systems is
a viable low-slope roofing option. However, many building owners,
designers and roofing contractors are unfamiliar or unaware of
SPF's performance attributes. Considering that SPF-based roof
systems have been around since the late 1960s, SPF has managed to
only capture a small share of the current low-slope roofing
For years, SPF-based roofing materials suffered from bad press
that publicized problems associated with early installations, such
as blistering, inadequate bonding between foam and coatings, and
poor workmanship. However, there now are minimum standards for foam
properties, improved application equipment, stringent applicator
training, better design and application guidelines, and improved
coatings. These improvements resulted from advanced technology, a
better understanding of roofing philosophies and aggressive public
relations efforts by the SPF industry.
SPF-based roof assemblies typically consist of three primary
parts: roof deck and/or substrate, polyurethane foam and protective
surfacing. A roof deck is the structural substrate that supports a
roof system. SPF can be applied to various types of substrates,
including wood, concrete, metal, rigid insulation and some...
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