Increasing attic ventilation is often touted as a good way to save money on AC by reducing the heat transfer from your roof to the rest of your house. And while it's true that the ventilation system in your attic is crucial to minimizing heat gain through your roof, saving money on your AC isn't the most important reason to make sure you have adequate ventilation from the below-roof area. In fact, your attic ventilation is also an essential element in keeping your roof healthy throughout its lifespan and preventing early failure. Here's how attic ventilation can save your roof.
Reducing thermal shock
The hotter your roof gets, the more strain it's under, especially if it gets heated up on a daily basis. This is because the hotter it gets, the more it has to expand and then the more it will have to contract later when it cools off. If you use attic ventilation to keep heat from building up under the roof, you can make sure that the roof is only being heated from one side rather than both. This will help it stay a bit cooler during the day, reducing the chances of damage by thermal shock (which can include buckling, cracking, and other types of shingle damage when the shingles are unable to expand or contract enough to keep up with the rapid heating and cooling).
Preventing moisture damage
Warm air rises, which means that the warmest air in your house is going to be the air that circulates up to the attic. But have you thought about that in conjunction with the fact that warm air also holds the most water? Humidity is generally higher in summer because cold air simply won't hold as much water. Warm air can, though, so the air that rises to your attic can carry plenty of moisture with it, especially during warmer seasons. This water can then condense on the inside of your roof at night, when the roof is cooler than the air in the attic. Condensed water on the inside of your roof is a very bad thing; it can cause water damage such as rotting, mold and mildew, softening of the wood, and other problems.
As you can see, attic ventilation isn't just for taking the strain off your wallet, it's for taking the strain off your roof as well. Of course this can also lead to further savings down the road if you can prevent or minimize roof damage and reduce the frequency with which your roof needs to be repaired and replaced.Share
17 May 2017
My name is Janet, and I am a professional architect and interior designer. While I love to design and decorate homes, I have recently developed another passion. I have fallen in love with the flat roof. Most people only see flat roofs in tall buildings in urban areas, but suburban homes can have them too. You can have a roof with a living space, a garden or even a pool. You simply need to design it so that water is adequately drained, and you can enjoy your roof almost as if it were an extra room. Explore the possibilities of flat roofs with me.