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Roof Ventilation Is Extremely Important

Few people give much thought to a roof system. Actually…  it is not until a roof breakdown that many homeowners begin recognizing how vital the roof is. One of the most essential elements of roof installation is understanding… roof ventilation.

We all know that warm air rises… This means that during the sizzling summer months hot & moist air will climb towards the roof. Apart from rising the temperatures in the attic and spaces next to the roof… this hot and humid air offers an exceptional environment for mildew and corrosion. The bad news does not end there… As the warm air nears the roof and shingles are exposes prolonged heat. This prolongs heat will cause shingles to age too soon.

The heat build-up in the attic also boosts temperatures in your home, thus making your HVAC system work harder, consequently delivering higher energy expense to your household. Unfortunately… You are not any safer in a colder climate.

During the winter… warm & humid air from the residence will find its path to the attic. When this occurs, condensation will also occur on the roof’s inner structural aspects and the attic itself! This may cause wood decay and promote molding and mildew    to flourish on attic insulation.

The trapped warm air in the attic will melt down the snow on the roof system… Thus causing it to freeze once again on the eaves and produce ice dams. All these circumstances are terrible to your roofing system and will curtail your roof’s life expectancy and void your warranty.

Correct roofing ventilation makes your residence livable in the summer and winter months. This is because superior quality ventilation supports good air quality by eliminating hot & humid air from inside of the residence. Venting your roof also helps increase lifespan of your roofing system along with your HVAC systems.

How Roof Vents Work

Simply said… Ventilation takes in refreshing air from outdoors and pushes stale air from the inside to outdoors of the residence. Realizing the natural movement of air helps homeowners realize why exhaust and intake are essential to a roof ventilation system.

Additionally… knowing how this work together is vital in helping homeowners realize the various vent types and which vents would be ideal for your residence.


The exhaust ousts used air from the interior of your residence. This is warm air that contains humidity. If this hot air is permitted to ‘stand’ within the house… Homeowners are opening themselves up to a molding and mildew troubles. Warm air in the house indeed rises in the direction of the attic. Because of this… vents are commonly positioned near the top of your roofline.


Intake vents are constructed to bring in crisp fresh air, fresh crisp air from outside and into the household’s interior. Ousting warm air from the inside of your house is essential to the durability of your roof and your house’s wellbeing. Though, hot air will not go away from the house willingly… This hot air needs to be pushed out. This act necessitates the air to be evicted from the residence… The cool air does a terrific job of this.

The cooler air enters your house via the attic intake vents. These are tactically placed beneath the roofline where exhaust vents rest. This means that cooler air will arrive in the attic under the warm air… Thus pushing the warm air outside via the attic vents.

Best Roof Ventilation Methods

It is forever prudent to confer with a trustworthy roofing specialist before settling on a roof ventilation system for your residence. No matter what method you choose… it does not hurt to know what the roof ventilation types imply. Here is a glance at a few of the best intake & exhaust roof ventilation techniques we have today in the industry.

Exhaust Types

Here are the leading exhaust varieties and how they behave.

Ridge Vents

These are the most recommended exhaust vents. A ridge vent is installed on the top of your roof line. Once in installed… it runs along the full distance of the roofline. The placement being at the peak point of a roof means they are best situated to permit hot air to escape from the attic space.

Furthermore, they run through the whole roof apex, giving ridge vents enough surface area for the concurrent discharge of copious quantities of air. When a ridge vent is complimented by an intake vent positioned below the roofline like a soffit vent… the system now offers the finest prospect of vertical ventilation. Let us look at how this works….

Vertical ventilation considers the normal flow of chilly air and warm air and gravity. In this method, chilly air will come in through the bottom and exit through the top. Apart from its performance, ridge vents are quite common to most installers!

For proper placement… a 2-inch-wide gap is arched along the peak of the roofline, from end to end. The ridge vent is then laid and nailed over the top. A ridge cap shingle is then bent and laid over the ridge vent. This is a sturdier, more flexible shingle and comes in diverse colors, permitting you to find one that flatters your roof’s esthetics.

Off-Ridge Vents

Off-ridge vents are merely comparable to ridge vents in that off-ridge vents sit at higher parts of the roof. Nevertheless, they are much smaller in size and are located lower down on the roof’s peak.

A standard off ridge vent is 4 feet long and made of galvanized steel. To have it install… A hole the dimension of the vent is cut 1 foot below the ridgeline. Off ridge vents can be beneficial for roofs with smaller ridgelines.

This is frequently the case, with distinctive roof lines that do not bear the usual long ridgeline at the roof’s peak. The same goes for homes with numerous peaks, valleys, and dormers. For roofs like this… having several off-ridge vents managing the roofs ventilation ideal.

Box Vents

These are like off-ridge vents, only more common. They are also recognized as low-profile vents, louvers, turtle vents, and flat vents. Box vents have no adjustable elements… which categorizes them as static vents.

Box vents create an opportunity for warm air in the attic to flee through an opening in the roof vent. This is through natural means. Box vents are installed in clusters throughout a roof by cutting holes for installation on the roof and for the vents to sit on.

You would need more than a few of these cleverly placed across a roof to deliver satisfactory ventilation.

Regrettably, 1 or 2 box vents are not sufficient to vent many houses. These vents come in assorted sizes, with the most highly common vent measuring 18 inches by 18 inches. Over the years, box vents have developed into being the 2nd most popular roof vents, followed by the ridge vents.

While their small size… The box vents do offer flexibility as their size permits for several tactical placements. Box vents mostly depend on organic convection, which can limit their usefulness.

Roof Turbines

These are aluminum blades encased in aluminum casing. These blades use the wind outside the residence to turn the blades… Thus pulling crisp air from outdoors into the attic space.

For the roof turbines to turn, they need winds of at minimum 5 to 6 miles per hour. This naturally makes them less useful on sluggish wind type of days. Consequently, this vent type will regularly necessitate a back-up plan; if not, you will run into some challenges during hot, peaceful summer months.

This is not their only limitation… Roof turbines are also quite small-scale in size. This restricts the amount of warm air they can pull from the attic area. To have profound impact on a home’s ventilation, the homeowners should install a handful of roof turbines. One or a two is just not sufficient….

Hard-Wired Powered Attic Vents

Powered attic vents are likewise identified as attic power vents or powered attic ventilators. These electric-powered vents have electric motor driving big fans. This process is what eliminates warm air and moisture from your attic space. Powered attic vents are extremely effective in moving the air. But they are coupled with high energy bills.

Some supplementary characteristics of powered vents are the changeable thermostats. This will turn the fan on when attic temperatures achieve a specific level. They may also have humanists that set-off the fan once the humidity levels achieve a particular degree.

The basic justification for installing roof ventilation is to maintain your attic at a continuous temperature in relation to the rest of the residence. Of course… your house can get cooler during winter and warmer in the summer, but what you will be trying to achieve is not having extreme variations from one season to the next.

This is essential to keep in mind when selecting powered vents as their power can disturb with your overall ventilation scheme. A weakly powered attic vent can fail to do its job efficiently, leaving you with ventilation challenges like structural harm.

Weaker vents tend to circulate air… As opposed to releasing stale air. Constant airflow is vital to a residence and is essential in the prevention mildew accumulation. However, what you need most, and the point of roof ventilation, is to remove warm air from the attic.

Power vents operate silently and at times even when faulty. While this is a superior quality… It can also make it difficult to tell when your vent is not working. If choose a powered vent… Please ensure regular inspections by a certified technician.


Intake Ventilation

Exhaust Vents forces Stale Air Out & Intake Vents bring the Fresh Air Inside


Soffit Vents

This is by far is a very prevalent type of intake venting and is always combined with the always-popular ridge vent. Soffit vents are mounted in the eaves of your roof.

This is immediately beneath your roofline, also recognized as the roof overhang. They have distinctive designs, but the most widespread designs include small holes that let air into the attic. Once the air arrives in the attic… It naturally shoves the warm air above & out of the attic via the exhaust vent.

You may be pondering critters and soffit holes. These should not concern you much because the holes are too small to permit critters inside.

Gable Vents

This is the elder statesman of intake vents it also partially functions as an exhaust system. Gable vents utilize cross-ventilation or horizontal ventilation to maintain air movement in the attic space.

The general theory is that air runs in from one gable vent on the end of the roof… And exits the attic via a different gable vent at the other end of the residence. The gable vent earned its name because it is used on residences with gable roofs.

Regrettably, the gable vents are not perfect for houses with more complex roof layouts. The explanation is simple… Roofing designs may also include valleys, peaks, dormers, rafter beams, and other roofing elements. These gable vents may also interfere with the cross beams and the roofing ventilation system.

Over Fascia Vents

Over-fascia and fascia vents are a more contemporary form of intake devise for roofs with extraordinary sized eaves to fit soffit vents. A fascia vent is positioned at the top of a fascia board & gutter.

This is beneath the first row of shingles. The concept behind this is to permit air intake when the wind hits the roof. Over fascia vents span the entire length of the roofline but still has a small surface area… Since they are frequently half an inch in height.

Compared to a soffit vent, over fascia vents supports lower airflow quantities. As such, these fascia vents are perfect for roofs whose shapes are too complex to be sufficiently served by soffit vents only.


Talk to an Expert

At Chrome Exteriors LLC, we take much pride in ensuring that our customers get the best of the best. If you are looking for the finest roofing ventilation for your residence or commercial property… Please call us today for a Free Consultation.

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