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Spray foam is applied using commercially available plural-component proportioning equipment. It should be applied by trained, professional contractors. SPF can also be applied using pre-packaged cans or larger pressurized bottles DIY Foam Insulation Kits for smaller applications.
The polyol resin and isocyanate material components are typically supplied in 55-gallon drum sets. The materials must be shipped and stored according specific procedures. Once in use on the jobsite, they are transferred from 55-gallon drums to the machine using special pumps called transfer pumps.
Typical equipment used to apply SPF has two metering, or proportioning pumps (one for each component) that heat and proportion the isocyanate and polyol resin through heated hoses to the spray gun in a 1:1 ratio. The two materials are kept separate through this entire system until they come together in the gun, where they are mixed and spray applied to the substrate.