Soffit Systems

Soffit Vent: What Is It and How to Install to Improve Ventilation?

Soffit Vent

Are you wondering if your attic needs soffit vents? Learn everything you need to know about soffit vents in this guide.

Soffit vents are important fixtures in any home. Soffit vents are fitted in your attic to prevent the build-up of moisture and to keep your attic cool. Soffit vents can help you to minimize any moisture damage and maximize the temperature control in your home.

Want to know more about soffit vents? Keep reading. This guide will discuss soffit vents, how they benefit your home, and how to install soffit them.

What Is A Soffit Vent?

A soffit vent is a roof vent that fits underneath your roof and provides airflow. Eaves are a part of your roof and hang over your home’s walls, perpendicular to the ground. On these eaves, are soffits, which are architectural features that protect your home’s architectural structures from elemental damage and provide aesthetic value. Soffits don’t just apply to your home’s exterior either. You can install soffits in your kitchen to fill gaps in your fitted kitchen installations and create a more cohesive look.

You can opt for wooden soffits, but this material will quickly deteriorate and become warped. A better alternative is a PVC soffit, which is far more durable, and even comes in faux-wood styles to give the appearance of an attractive and earthy wooden soffit.

Soffit vents attach to your eaves and provide more airflow. These soffit vents are holes that connect to ventilation baffles and prevent your insulation from blocking airflow. So, with a soffit vent installed, air from the outside will be able to flow into your attic. Soffit vents come in various shapes, sizes, and styles to suit your roof.

A soffit vent provides the following benefits for your home:

  • Increases energy efficiency—when you have a consistent flow of fresh air into your attic space, you can reduce the heat emission from your roof. You can also ensure that your roof does not overheat and maximize the efficiency of your air conditioning units.
  • Keeps your roof in good condition—if it is well ventilated, it will increase your roof’s lifespan and reduce the build-up of moisture.
  • Prevents mold—if your roof becomes moist, this will encourage mold growth. Daily household activities, like showering, will create moisture in the environment. By installing soffit vents, you can keep your roof dry and prevent mold build-up, which could be toxic to your health.
  • Compliant—if you have a shingle roof, having soffit vents will help you to meet the manufacturer’s warranty requirements.

Here are some of the downsides of installing ventilation on your soffits:

  • More critters—if you put holes in your soffit, insects might find their way into your attic more easily, particularly if they need to escape harsh weather conditions.
  • Elemental damage—your soffit vents could be compromised by harsh weather conditions.
Soffit Vent

Do You Need A Soffit Vent? How Many?

It can be challenging to determine whether your home needs a soffit vent or how many soffit vents are best to have. However, there are a few methods to check whether your home needs soffit vents and whether soffit vents have already been installed.

The easiest method of checking whether your home needs soffit vents is to go up into your attic on a hot summer’s day. If your attic feels overly stuffy with oppressive heat, this indicates a lack of airflow and a need for soffit vent installation.

Another way to check is to go up to your attic when it’s light outside. If you can see daylight seeping through the eaves of your roof, then this indicates that there are no soffit vents installed.

You must take care of how many soffit vents you install in your home. Soffit vents are intake vents that you must balance with the outtake vents that expel air from your home. The number of soffit vents that you install depends on how many outtake vents you can fit on your soffit alongside them.

The best way to determine whether you need soffit vents and also the number of soffit vents that you should install in your home is to speak to a professional. A professional soffit vent installer will be able to advise you on whether your home needs soffits, which type of soffit would be best suited to your home, and how many soffit vents you will need.

What Types Of Soffits Exist?

There are several materials available for soffits and you must choose the right material for your own house. Many soffits are made from aluminum or wood. However, these materials can warp and rust over time, which makes them less suitable for long-term use. PVC soffits are usually preferred, as they offer more durability, and if you have a PVC soffit or home exterior, they will fit with your home’s existing look and feel.

You can also choose from two different types of soffits:

  • Vented soffits—this kind of soffit is most beneficial for homes with a wider eave. The vented soffit comprises smaller vents between solid panels and is also ideal for homes with limited attic space. The vented soffit has many openings to allow outside air in for ventilation.
  • Non-vented soffits—a non-vented soffit is made up of continuous soffit vents that span the entirety of the eave. If you have a large attic that needs plenty of ventilation or a narrow eave, you may benefit from a non-vented soffit. This kind of soffit does not have any openings.
Soffit Vent

Where Should Soffit Vents Be Placed?

You should install your soffit vents along your home’s eaves. You can install them under the roof’s eaves to help air circulate through your attic space. And you should install them along the length of your eaves to ensure proper airflow.

When fitting your soffit vents, you should ideally place half of your soffit vents at the lowest point of the roof, in the soffit. The other half of your soffit vents should be placed in either gable or ridge vents, higher up on top of your soffit to allow air circulation.

How To Install Soffit Vents

Now you know what soffit vents are, how they work, and the best kinds of soffit vents, you can purchase your soffit vent materials and install them. Here are our best tips for installing soffit vents. Follow this guide to install your soffit vents.

You will need the following tools and equipment to install your ventilator system:

  • Soffit ventilation
  • Ventilation baffles
  • A ladder
  • A staple gun
  • A cordless drill
  • A plank of plywood
  • Protective equipment—hardhat, goggles, etc.
  • Aviation snips
  • A marker pen
  • A measuring tape
  • A hammer
  • A chisel

Make Two Parallel Lines, Cut Them, And Connect Them

To begin the installation process, mark where your soffit vents will go. To do this, you will need a marker and some measuring tape. You must draw two parallel lines along the center of your soffit. These lines should be two inches apart and span your soffit’s entire length. You will need a ladder to perform this process.

Next, you should take a circular saw and cut along the two lines that you have drawn. To do this, you must bore a small hole into the soffit and measure its thickness. Then, set your circular saw to make incisions at this depth.

Once you have cut your lines, you can use a chisel to connect them with a smaller line. You should do this at the end of the lines, near where the soffit ends. When these lines are connected, you can then pry the 2-inch piece of soffit from its place using a hammer claw, leaving a strip of space in your soffit.

Raise The Vent To The Soffit

For this next step, you’ll need a cordless drill. To prepare your soffit for attachment, you should drill evenly spaced holes into your soffit vent, which will allow you to attach the vent to the soffit. These holes should be around 13 inches apart. Lay the soffit vent on a piece of plywood to perform the drilling.

You should climb up your ladder to the soffit with your vent. Raise the vent to the soffit, and line it up with the strip that you have cut.

Soffit Vent

Attach The Vent To The Soffit And Remove Any Insulation

Once you have placed your vent where it needs to be, you can begin to attach it to your soffit. Remember, you’ll be on a ladder for this process—for your safety, you should be wearing a hard hat, and you should ideally have a family member or friend there to help you keep the ladder steady. Drill into your pre-prepared holes along the vent and attach them to the soffit. Using some aviation snips, trim the ends of your soffit vent to line up with the soffit.

Once you have installed your vents, you must ensure that no insulation is blocking the airflow. Go to your attic and pull back any fiberglass insulation that might restrict the ventilation. Fiberglass insulation can be very harmful to the skin and lungs, so while performing this process, you should wear a protective mask and gloves. Afterward, place your clothes into the washing machine to ensure no residual fibers.

Some insulation can be blown in and is not a sheet of material, so to move this type of insulation, you must use a garden rake or hoe.

Install Ventilation Baffles

Nothing will be in place to prevent the insulation from moving back into its original position and blocking the vents. So, you must install ventilation baffles. A ventilation baffle is a piece of plywood or PVC sheathing that creates a gap for airflow. To install your baffles, you will need a staple gun. Place the ventilation baffle in an upright position, stemming from your soffit, to increase airflow.


Soffit vents can improve your roof’s lifespan, allowing you to get the most out of your heating and air conditioning expenses. Installing a soffit vent is a straightforward process, but if you’re not very handy, it might be best to leave the work to a professional. At HB ELEMENTS, we provide high-quality PVC fittings for your home’s exterior—including trim, cladding, and more. If you want to learn more about HB ELEMENTS products, check out our website.