Spray Polyurethane Foam (SPF)

Spray Polyurethane Foam, more commonly known as SPF, is a type of roofing material that is applied through a liquid spraying process. The liquid then expands into a foam creating a solid layer across the entire existing roof substrate. A layer of Elastomeric coat is then applied for extra protection. Finally, a top coat is added along with granules for maximum roof protection. Polyurethane foam is suitable for commercial, industrial, and residential buildings.

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Installation Process


Before the installation can begin, the existing roof substrate will first be prepared by getting rid of any dust, dirt, and impurities.


Once prepared, primer is then sprayed across the roof from proper SPF adhesion.The Polyurethane foam forms by a combination of two liquid chemicals; Polyol, and isocyanate as it is being sprayed. The polyurethane liquid will expand 20 times in size to form into a solid 1 to 1.5 inch thick smooth surface across the existing roof substrate.


After the SPF layer has been applied, a second layer consisting of Elastomeric coating will be applied. This layer will be anywhere form 20-30 mils (1 mil = 1000th of an inch) in thickness which protects the roof and SPF from weather, UV light, and usual wear. This layer also provides the roof with the required fire safety ratings.

Pros and Cons of Spray Polyurethane Foam Roofing


  • SPF provides the highest R-Value “Insulation value” than any other roofing system in the market. Residential or commercial owners can save up to 40% in energy savings.
  • SPF Roof renovation comes at a fraction of the cost since a recoat is the only thing needed after 10-20 years. A 4000psi Pressure washer is needed to remove any debris from the roof for a new recoat job
  • Great durability thanks to the Polyurethane Foam’s ability to expand and contract with the building in accordance to outside temperature, reducing risk of splitting and cracking. The Polyurethane Foam’s high durability also makes it safe to walk on without any damage, and poses minimal risk to leak damage.
  • It is waterproof; During the installation process the SPF liquid can help fill any gaps, cracks, or seams on the existing roof substrate. Since this material does not require seams or joints, the risk of leakage through those vulnerable areas are eliminated completely.
  • The careful application of SPF will correct any unevenness in existing roof substrate which reduces ponding water that can cause damage to roof components.
Benefit of Spray Foam Roofing


  • SPF roofs cannot be installed in extreme cold, rainy, or windy weather conditions. Installation of SPF also requires existing roof substrate to be completely dry before it can be applied. However, thanks to California’s Mederanian-like climate consisting of warm, dry summers, and mild winters, installation of SPF can be done virtually all year-round.
  • Prone to some damage due to SPF’s lack of high resistance to punctures caused by mechanical damage or other unforeseen causes. However thanks to SPF’s thickness and closed-cell properties denying water from traveling laterally, the punctures will not cause leakage. Punctures can be easily repaired by using a caulk cartridge.
  • SPF roofs require inspections on a regular basis in order to spot any punctures or damages that should be resolved immediately. Check with the contractor for any additional questions in regards to keeping your SPF roof in great shape.