Attic Baffles – Everything You Need to Know

Attic Baffles - Everything You Need to Know

Attic baffles, or rafter vents, are an essential part of keeping your home well-ventilated and reducing the moisture on top of your house. If you want a well-ventilated attic that doesn’t regularly grow mold for you to remove, you’ll want to make sure your home is properly aired out.

While there are many projects for your roof that professionals should handle, attic venting baffles can be installed by anyone. This makes it a perfect home improvement project for those who love caring for their home themselves.

What exactly are attic vents baffles, are they necessary, how do you install them, and which are the best for you to buy? We have all the answers to your questions right here in this attic insulation baffles guide. Read on!

What Are Attic Baffles?

What Are Attic Baffles

In short, attic baffles are chutes that provide a way for air to flow from exterior soffit vents up to your attic.

Attic insulation baffles can be made of a variety of materials including:

  • Cardboard
  • Foam
  • Plastic
  • PVC

The material is then attached to the top of your attic’s ceiling, below your roof. They serve as chutes to your home for air to move through.

Soffits and rafter air channels work hand in hand to keep air circulating on top of your home. The chutes work to channel airflow from attic soffit vents, and baffles move the air through the area’s space.

Attic insulation baffles will also help keep your home protected from condensation, water damage, and mold. There are many benefits to having the right insulation in your attic. Using attic insulation baffles will:

  • Keep your energy bills down
  • Aid proper insulation
  • Improve your home’s air quality

Attic insulation baffles will insulate from touching the roof deck, thereby stopping condensation from forming just below your roof, which can lead to damage. And with how expensive attic insulation is, you want to keep it safe!

Are Attic Baffles Necessary?

Are Attic Baffles Necessary

To have a properly airy and insulated roof, you’ll want to have attic vents baffles. So while not every home will have attic soffit vents and baffles, it may be a necessary part of keeping your home safe from mold, condensation, and costly repairs.

Additionally, if you have intake or attic soffit vents, baffles are required. If you have soffits but no rafter channels, it’s time to take on this little home improvement project!

Attic vent baffles also prevent clogging in your soffits. Vents can become clogged by insulation. Perhaps your home is well insulated. But if the insulation stops air from flowing, you could have a serious problem. Rafter air channels ensure a clear path where outside air can move under the roof, keeping the area aired out.

Check if your home has the proper insulation and ventilation. If it doesn’t, and you see condensation building or even mold, it’s time to install attic vents baffles.

Attic Soffit Vents & Baffles

Your soffit vents work hard to keep your air circulated. This keeps your home cool and safe from condensation and mold.

Everywhere that there is an air intake piece (soffit), cool air is being brought into your home. This is so that cooler air outside can replace the hotter air in attics. But if it isn’t channeled through space, it will sit stale inside until eventually becoming warm and pushed outside again.

Attic venting baffles channel the air from outside, continuing the circulation. This is what keeps your home cooler. So, while rafter air channels are not required between every rafter, they are necessary for each air intake piece. The general rule of thumb is one soffit intake and rafter air channel for every 150 square feet under the roof.

How to Install Attic Baffles

How to Install Attic Baffles

If your home is in need of circulation, we have a step-by-step guide on how to install attic baffles under your roof.

  1. Measure the space between rafters in order to get the right size for the rafter vents. The rafter air channels will need to be able to be installed between rafters and generally need at least 16 inches.
  2. Place metal, plastic, foam, or cardboard attic baffles between rafters. Ensure they are not touching the ceiling, as this is where the air will flow.
  3. Staple the attic ventilation baffles into place.
  4. Continue this process up the roof along with the same rafter space. This allows air to travel throughout the space. Make sure to overlap the attic ventilation baffles so that air doesn’t escape between each piece.
  5. Use spray foam where each baffle meets to stop air leaks.
  6. Continue this process until each air intake piece has been covered or every space in between rafters.

How Many Attic Baffles Do You Need?

How Many Attic Baffles Do You Need

The questions of how many attic baffles you need in your home will come down to several factors:

  1. The size of your roof
  2. How many soffits you have
  3. Personal preference

The simple answer is that for every vent you have, the space between rafters to cover every vent should be covered. Multiply that by how many baffles it takes to cover the space between rafters from the bottom to the top of the roof. This will depend on your roof’s size.

However, there is also a question of personal preference. Perhaps you may want to install additional vents in the future. Maybe you want to maximize how airy it is. In either case, the more attic ventilation baffles creating airflow, the better.

This is also recommended if the insulation on the floor reaches the eaves. If this is the case, attic ventilation baffles will ensure a well-ventilated space for your house.

Best Attic Baffles

Best Attic Baffles

Now you know all about rafter air channels and how to install attic baffles. However, the one still question remains: Which are the best attic vents baffles for your home?

As we’ve mentioned, attic ventilation baffles present many options from size to material. But these are our top three picks for you to discover. Select which will be the best fit for your roof!

SmartBaffle 16″ Insulation Baffle

Best Attic Baffles - SmartBaffle

With thick plastic that will guard against any blockage, this design can be used with just about any insulation, including fiberglass, loose-fill, and spray foam insulation. It is tough against air leaks and can even be cut to double up on protection.


  • Dimensions: 37.5” L × 1/8″ thick plastic, 16″ wide
  • Material: Plastic
  • Weight: 1.05 pounds


  • Have double bending routes for each edge of the rafters
  • Durable — won’t crush or break
  • Provides a 2″ air channel


  • Installation may be more difficult due to the plastic compared to cardboard or foam

Durovent With Baffle Vent Channel

Best Attic Baffles - Durovent

The Durovent design includes a ventilation system as well as baffles for perfectly aired-out roof space. The polystyrene construction will prevent blockage while also being moisture-resistant to further reduce condensation. It is easy to install, and it keeps your home cool!


  • ‎Dimensions: 24″ W × 46″ D × 2″ H
  • Weight: 2.29 pounds
  • Material: Foam material


  • Lightweight
  • Moisture-resistant
  • Easy installation with staples


  • More expensive than plastic channels

24″ SmartBaffle

Best Attic Baffles - SmartBaffle 24"

Love the SmartBaffle design, but want something bigger for your larger rafters? Then this is the perfect product for you as it offers the same great design but larger to accommodate even more airflow. Keep insulation away from your soffit intakes and where it belongs.


  • Dimensions: 37.5” L × 1/8″ thick plastic, 24″ wide
  • Material: Plastic
  • Weight: 1.2 pounds


  • Adheres well to spray foam
  • Works with a variety of insulation materials


  • Ensure your rafters are at least 24″ apart, as these cannot be customized to a different size

Conclusion — The Importance of Attic Baffles

You may not often visit the top of your house, but it’s an important part of your home. A well-insulated space under your roof will protect you from the elements, while a well-ventilated one will prevent water damage and keep your home cool.

Attic vents baffles allow you to have all the insulation you need without sacrificing ventilation. So if your home is feeling the heat or starting to show signs of condensation, it’s time to get the attic baffles your home needs!