By now, you most likely have been involved with or are aware of a roofing project or specification that required the use of low-rise polyurethane foam adhesive. Because the frequency of projects using low-rise foam adhesive has increased in recent years, it is critical you understand the product's benefits and drawbacks and opportunities for its use. Doing so will enable you to locate projects where using the product may be appropriate.
Although low-rise foam has its drawbacks, most of which are related to application and equipment costs, there are advantages to using it to install roof assemblies. My roofing company, Jurin Roofing Services Inc., Quakertown, Pa., has realized numerous benefits from using the product. We have used it to drive the development of our Commercial Roofing Division, which, during 2001, installed more than 500,000 square feet (45000 m²) of roof systems incorporating foam adhesive. The product is best explained in the context of projects we have completed during the past several years. (Factory Mutual Research criteria did not apply to these projects.)
Attachment to non-nailable substrates
Often, building owners ask roofing contractors to provide pricing for roofing projects that require creativity in roof system design. On many occasions, contractors are presented with deck types that limit attachment options. The use of low-rise foam adhesive offers an alternative to traditional fastening methods, such as the use of mechanical fasteners or hot asphalt. For example, using foam adhesive enabled us to complete a 50,000-square-foot (4500-m²) Carlisle Fleeceback installation for a major Northeast real estate investment trust company.