Illinois Home Inspector Practice Exam 2025 - Free Home Inspector Practice Questions and Study Guide

Question: 1 / 535

What is the recommended amount of attic ventilation for every 150 square feet of attic floor area, without a vapor barrier?

One square foot

In attic ventilation, it is generally accepted that one square foot of ventilation is recommended for every 150 square feet of attic floor area when there is no vapor barrier present. This guideline helps to ensure adequate airflow, which can effectively prevent moisture buildup, reduce the risk of mold growth, and lower temperatures in the attic during hot weather. Adequate ventilation is essential for prolonging the lifespan of roofing materials and improving energy efficiency in the home.

The rationale behind this specific ratio lies in the need to balance air intake and exhaust. With one square foot of ventilation per 150 square feet of space, airflow is optimized to allow fresh air to enter and stale air to exit, thereby maintaining a healthy environment in the attic. This guideline adjusts slightly if a vapor barrier is present; however, the focus here indicates the conditions without it.

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Two square feet

Three square feet

Four square feet

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