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SOLVED: Can You Have Too Much Attic Ventilation?

There probably isn’t a more hotly debated question when it comes to insulating your home – can you have too much attic ventilation? The answer may sound like a contradiction in terms, but the answer is both yes and no.

Yes, you can have too much ventilation if it is the wrong kind, and if working against other vents. But for the most part, ventilation is good for a number of reasons.

With this in mind, let’s look at some myths and then some solutions to keep your attic perfectly ventilated throughout every month of the year. Hopefully the Home Logic team can shed a little light on things and offer a breath of fresh air…

can you have too much attic ventilation

Myth # 1: You Can Never Have Too Much Ventilation

In much the same way as you would want to use the right amount of heating or cooling with your HVAC system, you will also want the right amount of ventilation in your attic.

An attic space that offers too much ventilation can affect the quality and performance of your chosen insulation method. Too little, and you could be facing all sorts of related issues, such as condensation and mould growth.

So what is the proper amount of ventilation? In the United States, they use a formula which many roofers swear by, but even this isn’t really sufficient to tell whether or not you have just the right amount.

Their 1:300 rule (1 square foot of ventilation for every 300 square feet of space) doesn’t tell the whole story.

So much depends on the shape of the roof, the placement of the home, and the direction through which air flows. It really takes a specialist to calculate how much is too much or how much is insufficient. That being said, let’s move on to myth #2.

Myth # 2: Roof Vents Make Your Heating Bills Rise

Now then, on to the opposite end of the spectrum. While there are those who say you cannot have too much ventilation, there are others who say you should have as little ventilation as possible.

The thing to understand here is the purpose of ventilation, and the kinds of ventilation you should have constructed into your home. There is absolutely no truth to the myth that ventilation lets warm air out in the Winter. The real culprit here is inadequate or improper insulation, which we’ll get to in a moment!

The purpose of attic ventilation is to keep air circulating for two basic reasons. First, letting air flow keeps moisture at bay, which will help to prevent mould and mildew. Secondly, that very same flow of air helps to keep toxic odours to a minimum.

If you think that mould and mildew don’t have an odour, you must have never been experienced a home with black mould. It is just foul! It’s toxic whether you can smell the odours or not, and many people have become seriously ill, due to the build-up of mould in their homes.

Myth # 3: Insulation Keeps Your Attic From Being Properly Ventilated

Finally, many homeowners are reluctant to have insulation installed because they feel it will interfere with ventilation. We can assure you right away that this mainstream myth is just nonsense!

Many people realise they need ventilation, and may even consult a roofer to help with installation, but insulation remains untouched upon, or unthought of.

These same individuals fear insulation will interfere with the movement of air within their homes. In some cases, this may be true if the wrong type of insulation is being used.

However, some insulation is just laid incorrectly, so it takes an expert to know how to install insulation between rafters as it should be installed. Most modern insulation products are made and installed with ventilation in mind!

can you have too much attic ventilation

Can You Have Too Much Attic Ventilation? Final Conclusion

Can you have too much attic ventilation or not enough? The answer is a combined yes and no to both of those questions.

In the end, the most logical choice for ensuring the right amount of ventilation in your attic is to find a product that expands to the area needed, without blocking spaces where air should be free to flow.

Home Logic Spray Foam is such a product, because it can be accurately applied to the attic’s ceiling between rafters while avoiding openings in vents which need to be there.

Insulation is the key to your heating and cooling issues, and a good quality spray foam product is your easiest, safest and most cost-effective solution. To see whether your property is suitable for spray foam, By calling 0800 1700 636 or simply click the button below to request your free survey today!

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