Keeping your attic cool and dry makes it easier to maintain a comfortable temperature throughout your home and reduce your heating and cooling costs. A well-ventilated attic can also prolong the life of your roof.
When an attic isn't ventilated, warm, moist air will rise up from the living areas below. When this air meets the cool attic air, it produces condensation. If warm, moist air condenses on the attic insulation, it can reduce the R-value the insulating power of the materialand your home will become less energy efficient. Over time, this moisture will build up in the attic and can cause mold, mildew, and wood rot, which can result in serious structural damage to your home.
A well-ventilated attic not only helps keep your house cool in the summer, but it can also prevent costly damage to your roof in the winter. An unvented attic in the winter allows warm, damp air to rise. The warmer air will rise towards the top and center of the attic, causing snow to melt unevenly on the roof outside. The snow will accumulate towards the edge of the roof — which is much cooler — causing ice dams to form along the gutters. Ice dams can trap water melting from the roof, causing it to seep underneath shingles and leak into your attic.
In a well-ventilated attic, cool air enters through the intake vents and carries warm, moist air to the exhaust vents above. This prevents the warm air from building up and allows the snow and ice to melt evenly on the roof. All the ventilation openings need to be protected to prevent rain or snow infiltration. Proper insulation is also key to having a well-ventilated attic.
A vapor retarder a material that helps control the amount of moisture passing through the insulation should be installed under a gap-free layer of insulation on the attic floor to reduce the amount of moisture rising up into the attic and on the insulation. There should also be at least one inch of air space between any insulation or obstruction and roof sheathing.
Planning Your Ventilation System When you are planning your attic ventilation system, you should have at least one square foot of net-free ventilation area for every feet of attic space measured at the attic floor level. The net-free area is the total unobstructed area through which air can enter or exhaust a non-powered ventilation component. Most attic ventilation systems need to balance the airflow between the intake and exhaust vents.
The net-free ventilation area in the exhaust and intake vents must be equal. For example, if the intake vents on either side were venting a net-free area of 11 square feet, then the exhaust vent above them would need to vent a net-free area of 22 square feet.
Intake Vents: Allow dry, cool, outdoor air to come into the attic to help circulate warm, damp air towards the exhaust vents. Fixed Exhaust Vents: Fixed exhaust vents are stationary and designed to let air escape the attic.
Undereave Vents Mounted in a soffit the underside of an architectural element like an arch or balcony and allows air to enter the attic. Installed in solid soffits by cutting out an area between each rafter bay to ensure uniform air intake in your attic.
What is a Roof Ridge Vent?
Shop Undereave Vents. Mini Louvers Used with intake venting because they are too small to provide a sufficient net-free area of intake. Usually installed in an exterior wall to help eliminate moisture that collects in the wall cavity. More effective when installed below areas that source humidity, such as bathrooms and laundry rooms. Shop Mini Louvers. Vented Soffits These have vents cut into the soffits, providing ease of installation.
The vents are evenly spaced to provide efficient air intake. Shop Vented Soffit.Welcome to the Roofing Vents Store, where you'll find great prices on a wide range of different roofing vents for your home. Skip to main content. Roofing Vents Welcome to the Roofing Vents Store, where you'll find great prices on a wide range of different roofing vents for your home.
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Builder's Best. Amtrak Solar. Lippert Components. Plastic Oddities. Frustration-Free Packaging. Last 30 days Last 90 days. Energy Star. New Used Renewed. UnbeatableSale, Inc.Vent roofs with steeples, towers, or cupolas can be found in different buildings from barns to cathedrals. The building codes and building science for natural roof ventilation, however, only appeared in the s. Roof ventilation in a cold climate vents moisture and ensures a cold roof temperature to avoid ice dams.
In a hot climate, roof vents expel hot air from the roof or attic while relieving the load on the air conditioning system. Click for price. These are static vents without any moving parts and are installed over a hole that has been cut into the roof. By using natural convection, they make an opening in the roof that allows both moisture and hot air to escape from the house. They are generally made of very hard plastic, but they are also available made from metal and can be bought in a number of different colors so that they will best match the roof of your home.
While they can be installed anywhere on the roof, they are much more effective when they are installed near the roof ridge, as this allows the most moisture and heat to escape. While these have moving parts, they do not rely on electricity to move, but rather on the wind for power.
Less expensive versions tend to squeak when they are in motion. The spinning of the turbine is what is able to actually draw moisture and hot air out of the attic of the homewhich helps to prevent damage. Unlike box vents or wind turbines, these vents are very long and are placed down the whole length of the home along the top ridge. This means that you will have a lot of venting and that, as long as they were installed correctly, it will be very difficult to tell that you have vents on your roof, making them very attractive.
They are very efficient at venting out moisture and hot air from your attic due to their size, and when they are used in combination with soffit vents, they are incredibly efficient. This can help to extend the life of your roof, and it is a good reason to consider this type of vent. Power vents run on electricity and rely on large fans to drive all of the moisture and hot air out of the attic of your home. They are available in many different colors, so they will blend in with your roof, and some have advanced features that make them not only easy to use but also incredibly beneficial.
One great feature to consider is a power vent that has an included adjustable thermostat. This will allow the homeowner to set the fan to automatically turn on when the temperature in the attic reaches a certain degree, which ensures that you can protect your attic from getting too hot.
Guide to Attic Air Ventilation
There are also some models available that have humidistats. These operate very similarly to the power vents that have a thermometer, except they will turn on when the attic has a certain humidity level. These tend to be incredibly quiet and do a great job at venting your home.
One problem that some homeowners run into when they have quiet models installed is that they do not know when the power vent breaks and stops working. For this reason, regular testing is recommended. One problem that some people run into when they use a power vent in their home is that they will pull cool air out of the home up into the attic to help cool down the attic air during peak summer temperatures.
Because power vents accomplish this by pulling cooler air from the home through the light fixtures, attic access, and even wiring penetrations, they can make it very expensive to cool your home, as they are constantly removing cooler air from your house and moving it to the attic. While very attractive, cupola vents are often only used for decoration. However, you can use your cupola vent as a static vent. These vents sit on high walls and frame an opening that has been cut into the roof to allow moisture and hot air to escape.
They can be functioning roof vents, but they are generally used as a support vent to another primary system because they are not as reliable, nor do they offer the same abilities as other venting systems.Roof Vents & Loft Ventilation Techniques - Why Vent an Attic
Many people mistake off ridge vents for box vents, and while they are very similar in their functions, they do have some differences. These vents are static vents that are placed over holes in the roof close to the roof ridge.Learn something new every day More Info A roof ridge vent is a fixed vent installed on the ridge of a roof to ensure proper air ventilation within the house or building.
Ridge vents are typically made of metal. Once installed on the ridge line and possibly covered with shingles, the vents are inconspicuous. The main purpose of a roof ridge vent is to optimize airflow under the roof. Global concerns about energy-efficient building products and design has put roof ridge vents in the energy savings spotlight. If a house or building is outfitted with a ventilation system that provides the right amount of airflow, it is more efficiently heated, cooled and protected from moisture.
Roof ridge vents supply that airflow underneath a roof, keeping attic space sufficiently ventilated. A balance between airflow in and out must be achieved for a ventilation system to work properly. A roof ridge vent supplies the constant ventilation required in an energy-efficient home's attic space. Cool air from a home enters the attic through the floor. It rises and exits at the top because hot air, being less dense, rises.
Unless new air enters to replace it, the risen air will not leave, or vent. Installing a roof ridge vent as well as soffit vents under the eaves aids airflow. A roof ridge vent typically has a baffle to resist wet or windy weather. High-performance products may have internal weather filters.
The more rain and snow that is resisted, the drier it stays underneath the roof and in the attic. The temperature of an attic can vary greatly, reaching high temperatures that can harm its contents. Plus, a home's cooling system is over-taxed, resulting in high energy bills.
On the other hand, the temperatures of colder climates can cause condensation on a roof's underside. Left unchecked, moisture can cause extreme damage to a home's roof and insulation.
Repairs to boards and shingles, in addition to high heating bills, prove costly. Roof ridge ventilation is beneficial for low-pitched roofs as well as cathedral ceilings. The home's style is usually irrelevant.One of the most overlooked features of your roof is the roof vent.
However, if you live in a climate with a lot of heat and moisture, they can play a very significant role in the cooling of your home. Their basic purpose is to remove hot air and moisture from the home, and specifically, from the attic.
Roof vents come in various sizes and shapes. Moreover, they are often powered differently. The choice of which type is optimal for your home comes down to a number of factors, including cost and efficiency.
For example, while static vents have no moving parts and use the process of natural convection to remove heat, they are also not nearly as effective as those with a power source. Overall, residential homeowners have a choice of seven ways to cool their roofs and remove heat and moisture:.
One of the most common varieties is known as the box vent. As you might be able to tell from the name, the shape of a box vent resembles a box. Other names for this type include low profile, flat or turtle vent. The box vent is also known as a static vent, because it has no moving parts. Instead, the box vent is installed over a hole cut out of the roof. It uses the process of natural convection so that hot air and moisture can escape into the surrounding air.
In terms of aesthetics, box vents come in a variety of colors, as well as a variety of materials metal, hard plastic, etc. This gives homeowners tremendous flexibility in getting the perfect aesthetic for their roofs.
The turtle vent works best if it is installed close to the roof ridge. This is just pure physics: Since the roof ridge is the highest point of your roof, it allows for the optimal exhaust of air and moisture.
However, this flat vent does not offer the same sort of energy efficiency as other roof vents, and as a result it may require the home owner to purchase more flat vents than originally anticipated in order to achieve the necessary cooling and ventilation goals. Another popular type without any moving parts is known as the ridge vent.
In terms of appearance, many have compared the shape of a ridge vent to a book that has been opened up and then placed, face down, on top of the ridge of a roof. In most cases, the ridge vent will run the entire horizontal length of the roof. If installed optimally by ventilation experts, these ridge vents will blend into the overall roofline — a casual visitor to your home might not even know that they exist!
Ridge vents are most effective when they are combined with a ventilation feature known as a soffit, which is form of under eave venting. Overall, ridge vents are excellent at evenly distributing heat across the roof. Unlike other ventilation structures which often suffer from the problem of hot zones and cold zones, depending on airflow, the ridge vent is specifically designed for a very even distribution of heat and moisture.Back Roofing Shingles.
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