If you’ve spent time in your attic, you probably noticed that it’s not exactly the coziest place in the house.
Hot summer days make it an uncomfortable space in the house, mainly since air does not flow as well as you’d like it to in this enclosed space.
Installing attic insulation baffles is the key to maintaining proper air circulation in your roof.
Insulation baffles are cardboard or plastic chutes that act as pathways for air to flow freely through your roof. Insulation baffles ensure adequate ventilation of the roof timbers and prevent the buildup of moisture, which can lead to mildew, mold growth, and even rot.
This article will explain what attic insulation baffles are, why they’re beneficial for your home, how to choose the right type for your property, and the different baffles available on the market today.
Read on to find out more about this important topic.
For information about the different types of insulation available, you can read our article, “Home Insulation R-Value vs. Cost: What’s The Best To Buy?“
Insulation baffles are cardboard or plastic panels that allow fresh air to circulate along your roof behind the insulation.
They provide a channel for air to flow from the soffit vents in the eaves of your roof along the slope of the roof, between the rafters, and up to the ridge vents.
They’re also called rafter vents, venting chutes, insulation baffles, or wind baffles. Insulation baffles are air pathways/channels installed inside the roof system to allow free air movement through the roof.
Insulation baffles are also lightweight and easy to move around if you need to access your roof.
They prevent the insulation from blocking airflow into the attic. It is important to note that baffles are installed between rafters to achieve proper airflow.
Installing baffles in the attic ensures proper air circulation to prevent moisture build-up.
Unlike walls and floors, insulating the attic is a bit more complicated since the insulation often comes between the attic and the outside world. So how do baffles work to improve ventilation?
The attic baffles direct air that flows into the roof from outside along the spaces between rafters and out via the ridge vents.
Air enters the attic through vents in the soffit. The soffit vents are openings in the roof that allow air exchange between the outside and the attic.
Soffit vents, baffles, and attic insulation work together to ensure there is uninterrupted airflow behind the insulation in the attic.
Not installing baffles may cause attic insulation to clog soffit vents which will, in turn, hinder the free flow of air through the roof.
A highly effective attic ventilation system must have both exhaust vents and intake vents. The intake vents at the bottom of the roof’s overhang allow outside cool air to get into the attic, while exhaust vents at the top of the roof let warm and stale air out of the attic.
This ensures that moisture doesn’t build up in the roof, which could cause mildew and mold growth and even rot in the timbers themselves.
Attic insulation baffles can be categorized by size and material.
Some are made of corrugated cardboard and plastic, while others are made of foam.
Here’s a brief overview of each baffle:
- Cardboard baffles are made using corrugated stock. Apart from ushering in cooler, dry air, they absorb moisture and alleviate the risks of mold invasion in your attic. Unfortunately, this also contributes to their gradual failure.
- Plastic baffles are made from polystyrene and can withstand high temperatures and moisture, making them a slightly better option than the cardboard type.
- Some insulation baffles can easily be retrofitted in the attic to provide better ventilation. The tough plastic material ensures that they last a long time.
- Foam baffles are cheaper, lighter, and more flexible than other types of baffles. They can be easily inserted in tight spaces with staples. They are also durable and water resistant.
Once you install insulation baffles, your roof ventilation will be more effective, which means your repair bills will be lower. Also, your house will be protected from moisture-related problems arising from your roof.
There’s no denying that proper and balanced air circulation is essential in enclosed spaces such as the attic.
One of the benefits of attic baffles is that they keep insulation from blocking the soffit, ensuring proper airflow.
Here are some more reasons why insulation baffles are essential for your attic:
Attic insulation baffles help improve the quality of air in your home. Proper attic ventilation generally prevents heat and moisture inside your home from being trapped.
As you may already know, all the hot and moist air moves upwards into the attic. Also, warm air retains more moisture than cold air.
During winter, moist warm air from the rooms below rises to the attic. Without proper airflow, this moisture condenses on cooler surfaces in the attic, causing a damp environment that favors mold growth, leading to air quality problems.
The attic is the shield between the roof and your interior space. As such, you need to take good care of it.
Improper ventilation of your roof can create damp conditions, which lead to problems such as mildew.
Mold and mildew resulting from damp conditions feed on the organic materials in your attic, including the wooden rafters supporting your roof. If not addressed early, mold and mildew may cause expensive damages over time.
Insulation baffles allow homeowners to insulate their attics without blocking vents, thus ensuring there is proper air circulation which helps keep things dry and prevents them from damage.
This will help to prolong the life of your home’s structure.
An ice dam is a ridge of ice that forms above your home’s roof edge and eavestrough. The snow that melts on your roof can refreeze and build up again.
This happens because as the water trickles down the roof, it freezes.
During winter, ice dams build up on the eaves of sloped roofs of heated buildings.
This results from variations in the temperature of different parts of the roof, which causes snow to melt up top and freeze as it slides down the roof’s edge.
Heat rising from the ceiling into the attic warms the rooftop causing snow from the higher end of the roof to melt and flow toward the edges, forming a “dam.”
Upon reaching the roof’s edge below 32 degrees Fahrenheit (0 degrees Celsius), the water freezes, forming an ice dam.
Ice dams can damage the roof gutters. The good news is that all that can be prevented by properly ventilating the attic space using attic baffles.
Installing attic insulation baffles is sure to keep your home cool in the summer.
They also help you avoid problems, such as drywall moisture or pest issues.
You can install them yourself if you have a background in DIY projects:
Follow these steps to install attic insulation baffles in between the rafters:
- Determine the size of baffles that you need. Start by taking measurements of the space between your rafters to ensure you have the correct baffle sizes that fit snugly between your rafters. Some cutting may be involved to ensure that the baffle fits into place.
- Plastic baffles need precision. On the upside, these baffles are made of ABS, which means they are not readily susceptible to water and moisture damage. Additionally, it is excellent for high-temperature climates, so it will keep your attic cool and comfortable.
- Put the baffles in place. Generally, attic insulation baffles come in a few different thicknesses, so you can choose the one that’s right for your home. If you have the cardboard-type baffle, fold its flaps in a downward-facing position. Be sure to maintain the correct spacing between the baffle and the underside of the roof deck to allow air to circulate.
- Staple the baffles in place. Use a heavy-duty hammer stapler to staple the baffles in place.
That sums up the installation process.
With that in mind, the process will vary slightly by the baffle type.
Plastic baffles are more rigid, and that will give you an easier time inserting them in place.
Cardboard baffles are a little more delicate, and you must proceed carefully when putting them in place.
Proper care and maintenance of your attic will significantly impact the life of your attic space and your roof system.
You can provide appropriate ventilation in your attic by installing attic insulation baffles.
However, don’t hesitate to ask for professional help if you encounter broken insulation or have questions about how to do this job right in your own home.
Many people install radiant barriers in their attics. To find out whether you should, too, check out our article on the topic here.