The vents at the base of your house are known as foundation or crawl space vents. Many houses come with custom foam blocks that fit into these vents so that they can be blocked or opened. Opening and blocking your vents at the correct times throughout the year can save energy and keep mildew from building up in your foundation.
Foundation and Crawl Space Vents
These foundation vents are very small, and you may be wondering what purpose they serve. In fact, they do not help so much with air flow as with moisture displacement. Soil, even dry soil, can contain a lot of moisture. This moisture can seep into the crawl space from underneath, driven there by pressure and temperature differences. Moisture inside a crawl space is negative: it can rot wood, crumbling cement supports, and creating a breeding ground for mold. Foundation vents are designed to open passageways between the crawl space and the outdoors so that the moisture can escape back into free air, and the crawl space and air outside can be balanced. Thus, it's important to know when to open and close these vents.
Opening and Closing the Vents
If the vents allow humidity to equalize with outside air and prevent the build-up of moisture, along with mold and rot, then why are foam blocks used to close off these foundation vents? The problem is that you must heat and cool your house as the climate changes throughout the seasons. In colder months, when you heat the air in your house, the heat eventually travels to your crawl space, where it escapes through the foundation vents. This creates an energy drain on your home that costs money over the long term.
To avoid this problem, block up your vents in the winter, when you begin using your heat pump more frequently. Unblock the vents during spring, when the days start to get warmer and you use heat less, so that the moisture buildup can escape back into the air.
- Photo Credit Coffrage image by Christophe ThÃ©lisson from Fotolia.com
How to Open a Fireplace Vent
A fireplace vent is opened to create a draft for fanning a fire. The draft can be used to help start the...
How to Cover Crawlspace Vents for Winter
In the summer months, your foundation vents allow air into the crawlspace under your house, and this circulation is essential for keeping...
How to Vent a Home Crawl Space
To help control moisture and prevent mold under your home, it is a good idea to install crawl space vents. Many older...
How to Vent a House Roof
A properly vented roof is vital to the performance of the insulation and the roofing system itself. An improperly or inadequately vented...
How to Remove Crawlspace Vents for Replacement
Crawl space vents provide ventilation under the house. The vents should open and close without effort as necessary by hand. When vents...
How to Run the Air Conditioner With the Vent Open
In addition to the vents found in central air-conditioning units and those found on window AC units, both types of systems also...
Foul Smell From Heating Vents in My House
When you turn on your central heating system in your house, you expect a warm blast of air to enter through the...