Rural Hall Roofing: Article About Attic Ventilation
Many homeowners spend a fair amount of time and effort ensuring that outside air cannot get into their home. Drafts and gaps in windows and doors can allow outside air to enter a home, which frequently leads to increases in the cost of heating and cooling. However, letting outside air flow through an attic is an essential part of ensuring that both the attic and your Rural Hall roofing stay in good condition.
Proper attic ventilation can help to prevent shingles from being warped by excessive heat in the summer, and during the winter, ventilation can help stop ice dams from forming. Ice dams can cause a variety of damage to a roof, including enabling leaks to form due to standing water and causing the roof to sag from the weight of ice, snow or water.
Airflow is important in the summer because stagnant air is often humid. High levels of moisture in an attic can result in mold and mildew, and it can also cause damage to support structures. Air that is trapped in an attic will also get very hot. During the summer, air in an unventilated attic may be 20 degrees hotter than outside air. Since hot air rises, shingles may be exposed to enough heat to cause them to warp, and warped shingles may lose their ability to repel water.
ABC Roofing & Exteriors, Rural Hall roofers would be happy to answer any question you have about cement siding or roof cleaning.
In the winter, heat from a home can warm the air in the attic. As warm air rises, snow on the roof may melt. Melted snow will normally run down the roof until it meets freezing air again, usually occurring at the edge of a roof. Areas of refrozen snow are called ice dams, and melted snow may pool behind them.
If an attic is properly ventilated, warmer air may be cycled out of the attic before the snow on the roof has time to melt. Additionally, moving air has natural convection, so air cycling in and out of an attic may provide enough warmth to prevent melted snow from freezing again, allowing it to run off a roof and into gutters.
It is common for attic ventilation to be achieved through a combination of vented soffits and ridge vents. These provide locations for air to enter and exit an attic, and they are fairly easy to install in most homes. Some older homes may also use vented gables or attic fans to keep air moving through an attic.