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How Much Are Roof Vents

Static Vent With Curb Mount Flange

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AVP’s Round Back Static Vent with Curb Mount Flange is meant to be installed on . In addition, it works as both an exhaust roof vent and as an air intake roof vent. This static vent is ideal for venting out bathroom fans or range hoods. In addition, the round design is aerodynamic to withstand wind speeds up to 200 mph. The Round Back Vent is great for residential roof applications because of its low profile. AVP offers powder coating to match the color of the asphalt shingles. However, if you are looking to ventilate a duct, please see our Round Back Roof Jack for vents with a tailpipe adapter. On the other hand, AVP also has Static Vents with flat flanges for roofs with a pitch of 3/12 or greater.

Fact: Improper Ventilation Traps Heat And Moisture In The Attic

Heat doesnt rise, but hot air does. And when hot air sits in your attic for an extended period of time, the built-up moisture also sits there and dampens wood beams, floorboards, and roof decking.

That persistent moisture can cause mold growth in your attic or warp wood that is vital to ensuring your roof stays strong and secure. Thus, getting that moisture and hot air out of the attic is essential to temperature control and upholding the integrity of your roof.

Can You Have Too Many Soffit Vents

This is one of those questions that many HVAC experts tend to disagree on. The reason is that venting requirements can change on a case-by-case basis, depending on several factors including, climate conditions , roof designs, and attic structure. However, many agree that while having too many of these vents is rarely an issue, it is worth noting the minimum requirements for your home to stay in adherence to any building codes from your local government.

Also, it is generally more acceptable to have more soffits than you need for your home than to lack the necessary venting requirements. Technically, your venting systems most important goal is to have a balance with your exhaust and intake vents. If you dont, it could cause inefficiency with your venting system.

However, soffit vents tend to be quite passive in their ability to move fresh air into an attic, so a worse setup would be having too few of them or having them combined with gable vents . Generally, if you can still access your attic and no visible signs of rotting or molding on your insulation or floorboards, and you dont notice any strange spikes in your energy bills, the vent setup should be okay.

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Additional Considerations And Costs

  • Permits. You will likely need a permit from your city, municipality, or HOA to install new roof vents. Permit costs vary but expect to pay around $75.
  • DIY. Some homeowners may take a DIY approach to installing roof vents, though it is not ideal. Many variables impact the safety and efficiency of a roofing project, which makes hiring professional contractors vital. If you still choose to do it yourself, choose a simple, static roof vent and use safety precautions when installing.
  • Licensed professionals. Make sure that the roofing contractor that you hire is fully licensed and insured. You dont want to be liable for any accidents or incidents that occur when letting a layman install your roof vent.
  • Warranty. When you hire a roofer to install your roof vents, make sure that you have an agreement and warranty in writing. This covers you if the vent leaks or requires other repairs after installation.
  • Roof style. Sometimes, the style of your roof influences the overall cost of installing a roof vent. For instance, flat, shed, and butterfly roofs are flatter and easier to work with, while gable and A-framed roofs have a steeper and more complex structure making installation more difficult.
  • Steepness. If you have a steep roof, the contractors will have to spend extra time and potentially use additional safety equipment to install the roof vent. In this case, your costs will increase.

How Many Roof Turbines Do I Need

Attic Prep Part 6

How many roof Turbines do I need: Are you aware that several factors determine the appropriate number of turbines you need? Yes, these factors include, but are not limited to the type and size of the building. Roof turbines are mainly installed at the highest point on the roofs surface since they utilize wind power turbines to inhale all the hot air and moisture out of your attic.

Remember, installing the appropriate number of turbines is the only sure way of ensuring a balanced and effective system. Besides, it provides your house has a continuous supply of fresh and cold air.

It is important to note that several vital calculations are vital to accurately determine the number of turbines required during a roofing project. However, kindly note that this information is just an example since the precise number of turbine units needed depends on overall dimensions and your roofs shape.

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How Does Roof Ventilation Work

Roof ventilation works by providing a continual flow of fresh air through the attic, removing hot air and condensation from attic space, and by reducing the impact of rising or changing temperature conditions inside or outside of the home. The ventilation system includes exhaust and intake vents which are installed on the roof. Getting proper roof ventilation is a tough task. As roof ventilation design will provide plenty of air for insulation and flow under the roof. Thus, it will also balance the intake and exhaust ventilation in the attic space by increasing the lifespan of your roof.

Roof Vents: The Bottom Line

As you can see, the key concept in proper roof ventilation is balance. To achieve balanced airflow through your homes attic spaces, you need the correct amount of intake and exhaust vents. Roof intake and exhaust vents work together to help remove warm, moist attic air and replace it with fresh, drier air. In the process, air pressure remains equalized.

If you notice any signs of improper ventilation in your home, talk to a roofing contractor. They can check for airflow obstructions or see if you need additional vents of one type or another. Also, make sure to discuss ventilation solutions with your roofing contractor before beginning a roof replacement.

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How We Can Help You Vent

Long Roofing incorporates the best roof ventilation techniques on the market today. Recognized by the Asphalt Roofing Manufacturers Association, a CertainTeed roof ventilation system, as part of a whole roof system installed by Long Roofing, will have you on your way to reaping the benefits of a well-vented roof for 50 years or more.

Signs Your Roof Isnt Properly Vented / Ventilated

How to Plan a Balanced Attic Ventilation System | GAF Roofing Materials

Many have been mentioned such as clear signs of roofing damage cupped or cracked shingles, a warped roof deck or insect infestation.

You might also notice higher energy costs in summer, and any time of the year, mold in the roof structure can cause musty smells. You might even notice feeling sick breathing mold-infected air.

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Aura Vent With Curb Mount Flange

The Aura Gravity Vent with Curb Mount Flange will fit onto Roof Curbs. Roof vents that have curb mount flanges can be used as a hatch if maintenance is needed on a flat roof. The Aura Vent with Curb Mount Flange can be used for flat roof ventilation or it can be used for accessing a duct below. The 1/8 inch louvers will prevent precipitation and wildlife from entering inside the vent. Aura Gravity Vents are UL Listed and rated up to 50+ PSF or wind pressure above 200 MPH. Certified by Texas Department of Insurance, Florida State Approved & Conforms to the Standards of CALFIRE.

Calculating The Cost Of Installing Roof Vents

Before you start calculating how much the vents in question will cost, you have to know how many vents you need in the first place, and to do that, you need to know the surface area of your roof. Generally speaking, you should have1 square foot of vents for every 150 square area of roofing and attic space. You should further divide this between the two kinds of vents mentioned above, passive and active ventilation systems. The ratio of one to the other is up to you, and will depend in part on how much you are able to rely on the wind and weather to power a passive wind-driven rotary vent as opposed to a motor-driven one.

This is also true whether you are looking to install a whirlybird, soffit, or other type of vent.

Letâs take a more concrete example.

Say you are calculating for a 30â x 50âroof. In this case, the total surface area is 1,500 square feet. Youâll then want to divide that by 150 square feet, which gives us 10 total square feet of vent space required.

However, this is just the beginning. You now need to calculate the total area of each vent. This should be supplied by the manufacturer of the vent you are using, and may be referred to as the ânet free area.â

Once you have done that, youâll know the total square footage you need to cover with vents for the type of ventilation system youâll be using.

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Best Roof Ventilation Methods

As there are several methods of getting perfect roof ventilation to be installed at your home. These methods depend according to your budget plan or roof ventilation system cost. The method includes a checklist that confirms the perfect time for getting roof ventilation installed. Some of the best methods for roof ventilation are listed below

What Are Roof Mounted Attic Fans

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A roof mounted attic fan rests directly on top of the roof and helps regulate a propertys temperature by removing hot air.

Roof mounted attic fans are generally rated for only sloped and asphalt shingled roofs. They are generally not installed on flat roofs or slate shingle roofs. As a comparison, the other main type of attic fan are gable mounted attic fans which are mounted vertically on the gable vent.

Attic fans require cutting a hole into the roof sheathing and the asphalt shingles. Roof mounted attic fans are generally made of galvanized steel.

Roof mounted attic fans are wired into the homes electrical system, either hardwired at a junction box or plugged into an outlet. There are also solar powered roof mounted fans which don’t need any electrical wiring connections.

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Can You Have Too Much Soffit Vents

Yes, you can have too many soffit vents as long as they are divided equally between both sides of the roof. Having too much intake ventilation is not a problem it is having too many exhaust vents that is the problem.

In a passive ventilation system, the cool air enters the attic through the soffit vents due to a negative pressure created inside the attic by the wind blowing over the exhaust vents. Here the volume of the intaken air is the same as that of the exited air, there is no way the attic will develop a positive pressure due to the excess number of soffit vents. So having too many soffit vents doesnt have any impact on passive attic ventilation.

In the case of an active ventilation system ie, when you have attic fans, the amount of air intake is regulated by the size of the fans. If you have a very powerful fan, having some extra soffit vents will balance out any negative pressure created in the attic.

You can read more about this in my post here.

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Benefits Of Roof Ventilation

Roof ventilation is essential for every homeowner as it offers a range of benefits. Roof vents work throughout the year and in all climates to give your home the best protection.

Proper attic ventilation will extend the life of your roof by keeping the shingles cooler. In the warmer months, roof vents will allow air circulation so that hot air can escape. The attic and roof will both be kept much cooler, as a result. When the roof becomes warmer due to poor ventilation, this heats the roof shingles. When this occurs, the shingles become damaged.

Ventilation will also help homeowners to reduce their energy costs. When we enter the warmer months and summer begins, we want to keep cool inside our homes. A well-vented roof will allow the hot air to escape efficiently. As the hot air escapes, the attic is kept cooler and therefore reducing the strain on air conditioning systems.

Roof vents also help to reduce the extreme indoor temperatures. We have all walked upstairs to find it much warmer than downstairs. However, if this persists, it may be the result of a poorly vented roof. If hot air is unable to escape, it will stay in the upper levels of your home.

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The Need For Roof Ventilation In Winter

In winter, even well-insulated homes leak some heat into the attic. A fresh flow of air through proper ventilation will reduce it, helping to prevent the heat from melting snow on the roof. If snow does melt, the water can run down the roof to the eaves, which are not heated.

In freezing weather, the moisture and melted snow/water runoff will freeze and cause ice dams along the eaves. Those ice dams prevent water run-off, and the moisture and melted water backs up underneath the shingles, soaking the roof deck and potentially causing rot.

Secondly, when moisture isnt vented from a cold attic, it condenses on the roof structure. The same issues can develop rot, mold, and warping.

Quarrix Building Products 58784 Shingle Ridge Vent

How Does Proper Attic Ventilation Protect my Roof?

One of the hallmarks of the QUARRIX BUILDING PRODUCTS 58784 Shingle Ridge Vent is the ease of installation. This roofing component comes on a rolled mesh.

You do not need complicated additions to install it. Your roofing technician can complete the installation process in a matter of a few hours.

Additionally, this ridge vent effectively cools the entire house because it lies along the ridges length on your roof. It provides a large enough area for the elimination of stale air that usually accumulates in the attic. This creates space for fresh air currents to flow into your house from other apertures.

However, the edges of this ridge vent bulge up at the edges where you drive the nails. This happens after you have completed the nailing procedure before placing the shingles.

However, this is not a big problem because it clears after a day or two when the entire ridge vent lies snugly at the top of the ridge of your roof.


  • Its advanced storm stop technology is more powerful than the baffles in keeping weather elements off.
  • Ideal for maintaining a balanced indoor environment
  • It comes on a rolled mesh for easy installation


  • The ridge vents bulge up at the edges where the nails are immediately after installation.

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S To Calculate The Appropriate Amount Of Ventilation Needed In Your Home

  • Calculate the square footage of your attic space. To do this, measure the length and width of your home.
  • For example:Width: 40 ft, Length: 30 ft

  • Find the amount of ventilation needed for intake and exhaust. According to the National Building Code, you need 1 sq. ft. of ventilation for every 300 sq. ft. of attic space. Divide your square footage by 300 sq. ft., then round up to make sure youre getting enough ventilation.
  • 1200 sq. ft./300 sq. ft.= 4 sq. ft. of required ventilation

  • Convert square feet of Net Free Area to square inches. Multiply square feet of NFA by 144.
  • 4.00 sq. ft. x 144 = 576 square inches of NFA needed

  • Calculate the optimal amount of ventilation required. To ensure your roof vents are drawing from your soffits and not your other roof vents, we recommend that 50% of your ventilation should be provided by your soffits, and 50% should be provided by your roof vents . This means you should divide this number by two.
  • 576 sq. in. /2= 288 sq. in. of ventilation is required on the roof

  • Determine the number of vents required. The number of vents required for your home depends on the vent selected.
  • For example, if you are choosing a 50 square inch roof vent, 6 vents are required for a 1200 sq. ft. application:288 square inches divided by 50= 5.76 vents ~6 vents

    It is important to note that if your roof pitch is less than 4/12 or you have a vaulted or cathedral ceiling you will have to double the amount of ventilation needed.

    Can You Have Too Many Roof Vents

    No, you shouldnt have too many roof vents as they might damage your roof, build excess pressure in the system and increase your energy costs drastically. They might also blow your roofing shingles, causing leakages and pest infiltration in the attic.

    Additionally, too many roof vents disrupt the attics normal airflow and might sometimes feel windy. Of course, you can balance the number of intake and exhaust vents to adjust the airflow, but itll cost additional mounting and labor charges.

    And heres a list of some additional problems of over venting:

    • Temperature Variations: Over venting disrupts the normal airflow in the attic. So, it might lead to some hot and cold spots and hamper the even temperature distribution.
    • Pressure Imbalance: Over venting hampers the normal air pressure within the attic and might lead to banging doors, bursting shingles, and warped wood rafters in no time.
    • Mold Growth: Too many vents increase the condensation rate in the attic and might lead to fungus and mold around the rafters and joists.

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