Spray polyurethane foam, commonly referred to as SPF is a spray-applied insulating foam plastic that is installed as a liquid and then expands many times its original size. Spray polyurethane foam can be adjusted and have many different physical properties depending on the use desired.
Specialized equipment is used to apply the spray polyurethane foam and proper technical training is important in order to get the best results.
The oldest performaing SPF roofs in the world are over 30 years old. In Saudi Arabia, we have come across SPF roofs which are more than 15 years old. Because the physical properties of the SPF change little with age, how long the SPF roof system lasts depends primarily on the original application and long term maintenance. SPF life can always be extended by recoating SPF after 10 or 15 years.
SPF insulation properties are high because it is sprayed seamlessly without any joints. It also has the best R-Value amongst other insulation materials available in the market. It is the best when it comes to difficult structures because it adopts itself to the shape of the structure. Because of its waterproofing properties, it eliminates the need for two systems in a building
SPF is water resistant without other coverings; however, the surface of SPF can deteriorate under the sun's ultraviolet (UV) rays. Typically, elastomeric coatings or aggregate coverings are used to protect the SPF against UV radiation.
Both low and medium (2lb/cubic/ft) density SPF effectively reduce noise from outside sources by sealing cracks and gaps that allow sound to travel through the walls, floors and ceilings into the building. They are less effective against noise caused by vibration.