Before we go into detail, let's first talk about the benefits of having adequate circulating air. First of all, roofs should always incorporate a venting system regardless of the type of it is.
Let's answer a set of questions to better understand the importance of ventilating. First, do roof need ventilation? The simple and short answer to this is yes.
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When air is trapped, it could heat up and condense if the temperature outside suddenly drops. In some places, they forgo the installation of such systems, but this should be applied everywhere. This gives rise to the question, do you need roof ventilation?
The answer is definitely yes. The heat buildup inside the attic can be unsettling during summer. But what about in areas that get a lot of winters?
In a more detailed explanation, roofs need proper air flow at all times. Stale air is never good for a home, especially in critical areas. But before you jump right ahead you should first calculate how much you need. It's good to note that there is no "one size fits all" solution. Each one must be examined and that airflow must be calculated.
The most important thing about airflow is a balance. This equilibrium of intake and exhaust must be implemented each time. The roof's slope must be directly proportional to the size of the attic. Fail to correctly calculate and it will lead to problems in the future. This answers the question, does roof need ventilation?