There are two types of spray foam insulation: open-cell and closed-cell. Open-cell spray foam is made up of small cells that are not bound together, while closed-cell spray foam is made up of larger cells that are bound together. Closed-cell spray foam is more protective than open-cell spray foam, because the small cells can resist air infiltration.

Spray foam insulation is a type of insulation that is sprayed on the outside of buildings to help protect them from heat and cold. There are two types of spray foam insulation- open-cell and closed-cell. Open-cell spray foam insulation uses a gas-based propellant to create a high pressure in the canister that forces the insulation out through small openings. Closed-cell spray foam uses a liquid refrigerant to create the same high pressure, but the cells are closed, so the insulation stays inside the canister. 

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Open-cell spray foam is less expensive to install than closed-cell spray foam, but it offers less thermal protection. Closed-cell spray foam is more expensive to install, but it offers greater thermal protection. The type of insulation you choose will depend on your needs and budget.

When choosing spray foam insulation, you should consider your climate and needs. If you live in an area that gets cold winters, closed-cell spray foam may be a better option because it provides greater thermal protection. If you live in an area that gets hot summers, open-cell spray foam may be a better option because it is less expensive to install and does not require extra ventilation during hot weather.