Everything you need to know about roof vents

Your roof ventilation system’s foundation is made up of roof vents.


However, they help shield your roof system from damaging heat and moisture while allowing your attic to breathe.

Well, in this article I’ll be discussing about roof vents as the following questions will be discussed:

  • What is a roof vent?
  • What are the types of roof vents?
  • What are the uses of roof vents?
  • What is the basis of roof vents?
  • What are the elements of roof vents?
  • What are the advantages and disadvantages of roof vents?

Ok, let’s begin!


What is a roof vent?

A roof ventilation system operates by maintaining a steady airflow through the attic, which facilitates the removal of moisture and hot air from the roof and attic system and lessens the effects of shifting moisture and temperature conditions both inside and outside the property.

Below are the two major types of roof ventilation:

  • Intake vents
  • Exhaust vents

Intake vents


Edge vents are likewise comprised of a copolymer material, just like the ridge vents.  These intake vents, which are positioned at the roof’s edges, can be placed under the shingles, at the drip edge, or at the eaves under the soffit. Intake vents and ridge vents cooperate to provide cool air into the attic space while driving warm air out through the intake vents.

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Exhaust vents


Ridge vents are the most typical style of exhaust vent. They are put in place where two roof planes intersect. (Known as ridges). They are often laid beneath the last layer of shingles to give the roof a continuous appearance. They are composed of molded, high-impact copolymer.  Ridge vents can appear to be practically imperceptible to the untrained eye.

However, wind turbines, power attic ventilators, roof louvers, and gable louvers are a few examples of externally installed visible exhaust vents. Roof louvers and gable louvers operate without the usage of electricity, just like ridge vents. Wind turbines can also function without a power supply, but they are less efficient than ridge vents and perform better when there is a steady flow of wind. For some roof designs or places with little wind, power attic ventilators, which are powered by a power source, are an exhaust vent option.

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What are the types of roof vents?

Make an appointment with a knowledgeable roofing contractor before deciding which roof vent is ideal to use as a vent for your home.

However, adding roof vents typically necessitates the installation of a new roof, making it crucial to obtain quotations from reputable roofing contractors.

Below are the types of roof vents:

  • Turbine Vents.
  • Solar Powered Vents.
  • Power Vents.
  • Off Ridge Vents.
  • Box Vents (aka Louver Vents).

Turbine Vents

Some of the most well-liked roof vents are turbine vents, commonly known as “whirly birds.” These vents enable your attic’s air to circulate 10–12 times an hour.

However, there is widespread confusion regarding turbine vents. Many people think that your home can get infested with birds, dirt, rain, and snow because of your physical makeup. This only occurs if the turbine vent is harmed, in which case your vent needs to be replaced.

Solar Powered Vents

Homeowners frequently choose to switch to solar power; thus, it seems natural that makers of roofing vents would offer solar-powered vents. The energy needed to run these vents comes from the sun.

However, while the battery is charging, the vents are not operating, which could be problematic on gloomy days.

Power Vents

However, in a roof, power vents are the circular vents that are typically found close to the ridge cap. These vents use electricity to extract hot air from your attic and release it into the atmosphere. These vents not only assist keep your attic cool, but they also lessen the chance that humidity may harm the drywall and wood utilized there. Use a humidistat in conjunction with your power vent throughout the winter. This keeps the humidity in your attic at the ideal levels.

Power vents’ only drawback is that their motors frequently break down from overuse. If you use power vents, you need budget for the motors to be replaced every few years.

Off Ridge Vents

installation of a metal off-ridge vent on a roof covered in three-tab shingles. Active Ventilation Products, Inc. sells UV-45 Universal Vents like the one in question. (Discussed at the bottom of this section). An off-ridge vent and a ridge vent are only similar because they both are located close to the peak of your roof, despite how similar their names may sound.

Furthermore, “off ridge vents” resemble box vents far more than ridge vents! Comparing off-ridge vents to other, more efficient exhaust roofing vents, we find that they are not a very popular vent style and that we do not advise using them. Due to their size and location on the roof, off-ridge vents are less efficient than full-ridge vents. Their size prevents them from venting a lot of hot air, and their placement prevents them from releasing the hottest air possible, like a ridge vent. The length of the most common off-ridge vents on the market is 4 feet. Installation entails drilling a hole into the roof one foot below the ridge line, the size of the vent itself, which is frequently constructed of galvanized steel. In situations where the actual ridge line of the roof is narrow, off-ridge vents are helpful.

However, complex roofs and houses without a single, continuous, lengthy ridge line for a standard ridge vent to run across can cause this. For these kinds of roofs, adding one or two off-ridge vents might provide under-ventilated sections an extra boost.  This kind of vent could be useful to include in your ventilation system if your house has a lot of peaks, valleys, and dormers. However, this could not always be the case, so before making the contact, make sure you consult a reliable roofer.

Box Vents (aka Louver Vents)

For exhaust ventilation, a roof line is divided by three box vents. Off-ridge vents and box vents are comparable, although box vents are a much more common venting method.  Cutting a hole in the roof for the vent to sit over is one of the key installation similarities to an off-ridge vent. Box vents are typically put in groups across the roof to give additional ventilation, which is another resemblance. To properly vent your entire roof, you need far more than just one or two box vents.

Furthermore, box vents are more squarely shaped than their off-ridge counterparts, therefore their name. There are several different sizes available to fit your space’s requirements. The most popular box vent size available right now is 18 inches by 18 inches.  Box vents are one of the two most common exhaust vents you’ll encounter on a contemporary roof, along with ridge vents. When opposed to a ridge vent, their modest size is primarily a disadvantage but does offer some versatility. Box vents can be placed strategically in smaller areas that require air venting but cannot use a ridge vent since they do not need to span the entire peak of the roof.

However, using a box vent makes sense for more intricate roof lines with numerous different portions, just like with off-ridge vents. But a ridge vent is typically significantly more efficient if your roof line is higher. Off-ridge vents, on the other hand, are an excellent option if you have a hip roof because they are frequently utilized on hipped roofs.

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What are the uses of roof vents?

Your attic ventilation system’s foundation is made up of roof vents. They help shield your roof system from damaging heat and moisture while allowing your attic to breathe.

What is the basis of roof vents?

Below are lists of roof vents basis:

  • Be sure to select the correct pitch/slope option.
  • Prolonging the longevity of your roof.
  • The temperature in the attic will also help moderate temp of house.

Be sure to select the correct pitch/slope option

Installing adequate roof vents is a crucial part of extending the lifespan of your roof. This will not only allow the attic to air correctly and prevent condensation buildup, but it will also delay the aging of the insulation layer before your outer roofing materials.

However, for venting applications, the Globe Vent or any other round-based roof vents are used with the FAMCO roof vent bases. For flat roofs with no pitch or slope, a flat base (FB), a saddle base (SB), for installation on the crest or peak of the roof, and a pitched base (PB) are all options.

Prolonging the longevity of your roof

Make sure you choose a suitable pitch/slope option for the individual roof that will be built on when ordering the saddle base and pitched-based models. All of the roof vent bases have a wide flange for simple installation and water-tight seams to keep out moisture. If you choose a cheap plastic vent, it’s likely that it will need to be replaced eventually since it will become brittle and break, which will make your roof more susceptible to water leaks. To make sure the ventilation is free of leaks and cracks, routine maintenance must be done.

However, make sure your roof design has the necessary amount of intake and exhaust vents. These sums ought to be equivalent. This can be calculated using the roof’s slope (the ratio of the attic floor’s square footage to the “net free area”). (NFA). The NFA rating of vents usually allows you to calculate how many you’ll need. It is preferable to err on the side of having too many vents than not having enough, which will lead to issues in the future.

The temperature in the attic will also help moderate temp of house

For the sustainability and longevity of your roof, adequate vents are crucial. Roof vents remove warm air in the summer and prevent moisture buildup in the winter.

However, the intake vents are frequently located closer to the bottom of the roof, whereas exhaust vents are located higher, closer to the peak. This fully utilizes the natural path of air movement.

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What are the elements of roof vents?

Below are the elements of roof vents:

  • Connections for chimneys and walls.
  • Under-ridge elements.
  • Accessories for ventilation.

What are the advantages and disadvantages of roof vents?


  • Roof vents carry air out of the attic space using the power of the wind, the sun, electricity, or natural convection.
  • Ventilation in cold weather may remove moisture from a house and avoid ice dams.
  • In the heat, ventilation may remove hot air, lowering energy bills and maintaining a comfortable temperature in your home and attic.


  • Require more maintenance than other types of vents.
  • Difficult to install.
  • Birds may often make nests in them, blocking airflow.

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Roof vent FAQs

What is a roof vent for?

Your attic ventilation system’s structure is made up of roof vents. They help shield your roof system from damaging heat and moisture while allowing your attic to breathe.

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What is the best type of roof vent?

Below are seven types of roof vents:

  • Lomanco Whirlybird Turbine B I B-14.
  • Lomanco Whirlybird Turbine B I B-12.
  • Air Vent Airhawk Wind Turbines.
  • Air Vent Venturivent Plus.
  • Maxx Air 1,650 Cfm Gable Mount Power Attic Ventilator.
  • GAF Materials Cobra Exhaust Vent for Roof Ridge.
  • QuietCool Thermostat Controlled Gable Fan for Attic Cooling.

What are the 4 types of roof vents?

Below are four types of roof vents:

  • power
  • Ridge
  • Solar-powered vents
  • Turbine

What is a roof vent called?

Roof louvers, often referred to as static roof vents, are made to fit into the highest points of a roof and rely on wind to operate. Gable vents are a kind of louvered vent that, depending on which way the wind is blowing, can function as an intake or exhaust vent.

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Why do you need a vent?

Hazardous sewer gases may accumulate in the plumbing system without a vent, which would make it more difficult for water to flow through the pipes effectively. The issue with a blocked plumbing vent is that it won’t let air out, not that it won’t let air in.

How do vents work?

Air vents are entrances to the ducts that run throughout your house and allow unrestricted airflow to and from your HVAC system. The HVAC circulates conditioned air into the rooms through supply vents, while return air vents draw conditioned air from the rooms back into the cooling system.

Does a roof need vent?

A non-ventilated roof can also result in sweltering attics, where the heat eventually damages the wood frame, rafters, underlayment, and other components due to the heat buildup. The lifespan of your roofing system is increased by ensuring that your roof is uniformly and adequately ventilated, which aids in the air’s escape.

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Where do you put a roof vent?

Exhaust vents should always be installed at the highest position on the roof, often the highest point of the attic area (at or near the ridge).

How many vents does a roof need?

What Number of Vents Do I Need? If the attic has a vapor barrier, the conventional rule of thumb under these circumstances is that there should be one vent for every 300 square feet of attic space. In that case, there ought to be one vent every 150 square feet. For every 150 square feet of attic space, you require 1 square foot of vent space.

What materials are roof vents?

Aeration Vents

Soffit vents are typically built into your soffit, which is the surface beneath the eve of the roof and is composed of aluminum or vinyl. Soffit vents can be identified by the tiny openings that provide an airflow-free area.

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That is all for this article, where we’ve discussed the answers to the following questions:

  • What is a roof vent?
  • What are the types of roof vents?
  • What are the uses of roof vents?
  • What is the basis of roof vents?
  • What are the elements of roof vents?
  • What are the advantages and disadvantages of roof vents?

I hope you learn a lot from the reading. If you do, kindly share it with others. Thanks for reading; see you around!

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