Spray Polyurethane Foam

Spray Polyurethane Foam (SPF) is a versatile and high-performance insulation and sealing material widely used in residential, commercial, and industrial buildings. It is applied as a liquid that rapidly expands into a rigid or semi-rigid foam, creating a continuous barrier that adheres to surfaces such as walls, roofs, ceilings, and floors. Spray Polyurethane Foam is recognized for its superior thermal insulation properties, air sealing capability, moisture resistance, and structural reinforcement benefits.

SPF is created by mixing two liquid components—typically an isocyanate and a polyol resin—through a spray gun. When combined, these chemicals undergo a rapid exothermic reaction, forming a foam that expands and hardens within seconds. This application method allows the foam to conform to irregular surfaces, gaps, and cavities, making it ideal for retrofits and complex architectural designs. The result is a seamless, monolithic layer of insulation that minimizes thermal bridging and air leakage.

Open-cell SPF is softer and more flexible, with a lower density and higher permeability to air and moisture vapor. It is often used for interior insulation applications such as walls and ceilings, where it provides excellent sound dampening and effective thermal insulation. Open-cell foam is typically more affordable and expands significantly upon application, helping it fill larger cavities with less material.

Closed-cell SPF is denser, more rigid, and has a higher insulating value per inch. It offers superior moisture resistance, air sealing, and structural reinforcement. Due to its low permeability and high compressive strength, closed-cell foam is used in demanding environments such as roofing, exterior walls, foundations, and areas prone to moisture exposure. It also adds shear and racking strength to buildings, improving overall structural integrity.

SPF is also valued for its longevity and durability. Once cured, it forms a strong, resilient surface that is resistant to settling, sagging, and degradation over time. It adheres well to a variety of substrates, including wood, concrete, metal, and masonry. In roofing applications, SPF systems are often coated with protective layers to enhance UV resistance, waterproofing, and surface durability.

Beyond insulation, SPF is used for a range of specialty applications, including void filling, soundproofing, tank and pipe insulation, and as a core material in composite panels. Its adaptability makes it suitable for both new construction and renovation projects, as well as for use in harsh environmental conditions.