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Unvented attic spaces and vented attic spaces are two different approaches to attic design and ventilation.

Vented Attic Spaces:
A vented attic space is the more traditional method of attic design, and it involves providing ventilation to the attic space. Vents, such as ridge vents, soffit vents, or gable vents, are installed in the roof to allow air to flow into and out of the attic. This ventilation helps to keep the attic space cool and dry, reducing the risk of moisture buildup and damage to the roof and other parts of the home.

Unvented Attic Spaces:
An unvented attic space, on the other hand, does not have vents and relies on a combination of insulation and airtight construction to maintain a stable temperature and humidity level in the attic. In this design, insulation is installed on the roof deck, rather than the attic floor, which helps to prevent heat from entering the attic space. In some cases, a vapor barrier may also be installed to prevent moisture from entering the attic space.

There are pros and cons to each approach. Vented attics can be effective at keeping the attic space cool and dry, but they can also allow in moisture and heat, which can lead to problems with mold and mildew. Unvented attics can help to prevent moisture and heat from entering the attic space, but they can also create a buildup of humidity, which can cause problems with moisture and mold.

The choice between a vented or unvented attic space will depend on a number of factors, including the climate in your area, the type of roofing material used, and the overall design of your home. It's best to consult with a professional contractor or architect to determine the best approach for your specific situation.