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Using Spray Foam Insulation in an Unvented Attic Application

Using Spray Foam Insulation in an Unvented Attic Application

Your attic is one of the most important areas of the home to insulate. Attic ventilation is often implemented as a means to reduce excessive moisture buildup, save energy, and prevent damage to one’s roof. However, attic ventilation isn’t the only solution to such issues. In fact, an attic with an unvented assembly and spray foam insulation may be an even more advantageous choice for your home. To learn about the benefits and considerations of using spray foam for an unvented attic application, continue reading.

Benefits of Spray Foam in an Unvented Attic Assembly

Attics are often constructed with vented assemblies in order to prevent moisture buildup. However, not all attics are easy to ventilate. For example, if your home’s roof has a turret with converging rafters, adding a vent will prove difficult. Fortunately, a vented assembly isn’t the only way to reduce excess moisture in an attic. Spray foam insulation prevents the flow of air into or out of an attic assembly. In blocking the passage of air, the insulation prevents the transportation of moisture into or out of the attic as well, thus preventing mold growth in the attic.

Due to its moisture-blocking properties, spray foam insulation is an ideal insulation option for unvented attic applications. Plus, it can also prevent allergens such as pollen or dirt from entering the attic, which will provide further protection.


Upon installing spray foam insulation in an unvented attic assembly, you may also choose to install an HVAC system or dehumidifier in the space. By moving such a system into the thermal envelope, you can condition or semi-condition the attic and prevent overheating or further moisture buildup. People who live in hot and humid climates should highly consider installing HVAC systems in their unvented attics.

It’s also important to consider local codes for unvented attic assemblies, spray foam, and energy efficiency in terms of building a thermal envelope. Familiarizing yourself with the building codes in your area will ensure your home is safe and within regulation.

If you’re interested in installing attic insulation in Crystal Lake or the greater Chicago area, Paragon Protection can help. We offer a wide range of spray foam insulation services, which are implemented by our highly skilled contractors. To learn for yourself why Paragon Protection has become the most trusted spray foam insulation contractor in the Chicago area, contact us today.

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