General Contractor Houston Polyurethane Foam Commercial Roofing
UNDERSTANDING LOW-SLOPE ROOFING SYSTEMS Very few people are experts on every kind of roofing system. However, the various types of low-slope roofing systems frequently considered for schools basically can be divided into two categories: multi-ply or single-ply. Multi-ply systems generally are bitumen-based (asphalt or coal tar), while single-ply includes polymer and metal systems. Several factors should be considered when selecting a roofing system. The installation design, its application and potential problems are important when determining the optimum system for a particular building. Another consideration is the environment. Although there are no nationwide programs to recycle roofing waste, some materials can be recycled or put to use in other ways.
Polyurethane Foam Description: Foam roofs are a combination of a sprayed-in-place polyurethane insulating foam, typically coated with liquid-applied waterproofing membrane. The waterproofing membrane also protects the foam from ultraviolet attack and is commonly either silicone-, urethane- or acrylic-based.
Ideal Application: Foam is best suited in recover applications where low weight is needed, or additional slope is desired. It also is good on new construction where there are unusual roof configurations or domes.
Potential Problems: Weather during application is critical, as the foam cannot be applied in winds over 25 mph, on very hot or cold days, or when water (rain, standing water, very high humidity) is present.
These systems are not recommended in areas of high roof traffic. Bird damage to the foam and coating has been reported.
