Spray polyurethane foam (SPF) is a spray-applied plastic that can form a continuous insulation and air sealing barrier on walls, roofs, around corners, and on all contoured surfaces. It is made by mixing and reacting unique liquid components at the job site to create foam. The liquids react very quickly when mixed, expanding on contact to create foam that insulates, seals gaps, and can form moisture and vapor barriers. SPF insulation is known to resist heat transfer extremely well, and it offers a highly effective solution in reducing unwanted air infiltration through cracks, seams, and joints.

Types of Spray Polyurethane Foam

There are three primary types of SPF that can be used for insulation and other specific purposes:

  • High Density: often used for exterior and roofing applications
  • Medium Density: often used for continuous insulation, interior cavity fill, and unvented attic applications
  • Low Density: often used for interior cavity fill and unvented attic applications

Each product offers unique benefits that a professional SPF contractor can explain to you and help you determine which types of foam will be most appropriate for your building, climate, and project. Beyond the structure of the foam itself, the other significant difference relates to how it is created and installed. The main delivery systems include:

Your SPF contractor can help you choose the appropriate product and delivery system for your renovation or insulation project.


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