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PROPER ATTIC VENTILATION

Our solar-powered attic ventilation fans are the ONLY fans that work alongside a home’s passive venting system to boost its effectiveness in keeping attics cool and dry. Why is that important? Passive venting is the industry-wide standard for proper attic ventilation. Shingle manufacturers’ warranties and building codes require homes to be properly ventilated.

Attic ventilation is perhaps the most misunderstood area of roofing, and if neglected, leads to some very hideous and dangerous consequences. Ventilation is not an option; it is a necessity especially with today’s air-tight homes.

What's the Big Deal about Venting?

The reasons and the theory behind roof ventilation depends on the climate, but no matter where you live, proper roof ventilation should never be viewed as an option. Unfortunately, most homes in the United States do not have adequate ventilation, if they have any at all. And this lack of ventilation leads to many costly and avoidable repairs as well as wasted energy and potential health issues.

Cold Climates

Cold climates need proper ventilation to avoid ice dames and moistiure in their attic.

In cold climates, ventilation is needed to avoid ice dams by maintaining a cold roof temperature. It is also needed to remove moisture that comes in from your living space below.

Hot Climates

In hot climates, ventilation is needed to remove the sun-heated attic air in order to lighten the burden of the home's cooling system which will save money.

Hot climates need ventilation to exhaust the hot air that is costing homeowners cooling expenses and prematurely aging their roof shingles.
Passive Venting Illustration to show what happens to a house on a 90 degree sunny day

The illustration above shows what happens to a home on a typical 90°F sunny day. The roof deck's temperature will reach 170°F and the attic will heat up to 140-150°F. Yes, you basically have an oven sitting on top of your living space. These types of temperatures not only affect your home's ability to keep your living space cool, but they also negatively affect the longevity of your roof. The hot climate heat combined with an improperly ventilated attic will actually bake roof shingles and age them prematurely.

Benefits of a Properly Vented Roof

A good roof design will include a balanced passive attic ventilation system. What that means is for every inch of air exhausted at the ridge, there needs to be a balanced amount of air coming in through the eave’s intake vents. You should never install only exhaust or only intake vents on your home. They must be balanced in order to effectively achieve air movement. Having a balanced passive attic ventilation system also means that there is uniform eave-to-ridge air movement across the ENTIRE length of the attic. Air movement is crucial to maintaining a healthy attic. Proper passive ventilation, as pictured above, allows the attic to breathe and has the following benefits:

  • Expels heat.
  • Expels moisture.
  • Reduces cooling costs.
  • Reduces wood rot.
  • Increases roof life expectancy.
  • Reduces risk of mold and mildew growth.
  • Keeps insulation fresh.
  • Reduces attic air temp difference from outside air.
  • Reduces heating costs.
  • Stops heat transfer into living space.
  • Healthier attic makes for a healthier home.
  • Improves interior air quality.
  • Works all year around.

Boosting Your Passive Vent System with a Revolutionary Solar Vent Solution

Once a balanced passive vent system is achieved, boosting the effectiveness of that venting system is the advantage that Solar Blaster brings to the table. Multiple solar-powered attic fans that fit right inside the passive vents roofing professionals are installing on their homeowner’s roofs allow these vents to remove hot and moist air even on non-windy days. We love the irony that we are utilizing the source of the heat problem, the sun, to also be the solution for removing the hot, moist air in attics.

  • Expels heat faster.
  • Expels moisture faster.
  • Reduces cooling costs more.
  • Reduces wood rot more effectively.
  • Increases roof life expectancy longer.
  • Reduces risk of mold and mildew growth more effectively.
  • Keeps insulation fresh more effectively.
  • Reduces attic air temp difference from outside air faster.
  • Reduces heating costs more effectively.
  • Stops heat transfer into living space more effectively.

AND these additional benefits:

  • Easy to install.
  • Less expensive than larger solar-powered fans.
  • Uses the source of heat to be the solution at no additional cost.
  • Multiple fans don't leave hot spots.
  • Does not require thermostat control.
  • Works even on non-windy days.
  • Installs from the roof top.
  • Works even on slightly cloudy days as they only need enough light to power at least one fan.
  • Activates passive vents to make them more efficient.
  • Multiple fans promote uniform air movement across the entire attic.

Solar Blaster RVOblaster vents effectively promote air movement across your entire attic space

Solar Blaster RVOblaster Vent solution for cam vent system

Multiple Solar Blaster RIDGEblaster vents help promote uniform air movement to vent hot air from your attic

Solar Blaster RIDGEblaster Vent solution for a ridge vent system

So Wait! Why isn't Bigger Better?

Glad you asked. Other larger solar-powered attic fans on the market are not only 2-4 times more expensive, they can actually circumvent the design and science behind the passive venting system. Remember, uniform eave-to-ridge air movement across the ENTIRE attic length is the key to proper attic ventilation. Homeowners are often installing these large solar vents in addition to their current passive vent system and that leads to problems. Large fans leave problematic hot spots in the attic — they pull air only from one spot on the roof. And if combined with other exhaust vents, they often pull air from neighboring passive exhaust vents or gable vents rather than down at the eave’s soffit intake vents. So bigger and more powerful is not the key to a properly vented roof.

Ineffective turbine vents don

What about those Whirly Bird Vents?

Wind turbine vents require wind to operate so on still, hot and humid days, they do not operate. In addition, to be effective, you would need to place them across your entire roof line. Do you really want multiple of these types of less-than-appealing vents up on your roof?

Multiple, Smaller Solar Fans are the Key

Multiple, smaller solar fans that fit on top of your existing passive vents are a much better and effective system. Your home's passive vents should be spaced evenly across the entire attic length and by adding a SolarBlaster vent solution to each vent, your vents will be much more effective in exhaust your attic air. Also smaller solar fans require less power to start operating so our fans will work even on slightly cloudy days and there's no need for an on/off switch or thermostat control. Remember, you want your passive vents to be working all the time day and night. With SolarBlaster's products, you can now activate your passive vents so the sun can start removing its own hot air during the day!

Check out our new Vent Calculator to figure out how many vents you need on your home or shed.

A Balanced Ventilation Solution is also Key

"It needs to be recognized it is not readily possible to vent more warm, moist air out of an attic than the amount of new air allowed into the attic, such as with soffit or eave vents." (http://docserver.nrca.net/technical/9983.pdf) That is why building codes generally require a balanced approach to attic ventilation requiring an equal amount of intake to exhaust vents.

"In unbalanced attic ventilation situations where the NFVA at or near the top of the space being vented greatly exceeds that of the soffit or eave vents (such as is permitted in IBC 2012), it is possible for a slight negative pressure to be created in the attic space. This has the potential to allow conditioned air from the occupied areas below the attic to be drawn into the attic. Unsealed openings in the ceiling plain, such as ceiling recessed light fixtures, exhaust fan openings and plumbing vent stacks, are common areas of conditioned air loss into attics." (http://docserver.nrca.net/technical/9983.pdf)

That all adds up to higher energy costs as your conditioned air from inside your home gets sucked up into your attic. You don't want that so aim to have a balanced ventilation system in your home.

Activating passive vents on homes across the United States

Interesting Tidbits

Hot air balloons are the perfect illustration that hot air rises.
No duh, hot air rises
That’s right. A home’s passive ventilation system is designed around the simple fact that hot air rises. That is why passive vents are installed as high on a roof as possible. Ridge venting makes the most sense as it lets air escape at the highest point on your roof.
A super heated attic space is like living under an oven.
An attic is like an oven
On a nice, sunny 90°F day, your roof deck is 170°F and your attic heats to 140-150°F. That's an oven on top of your living space.
Heat and moisture are the worst enemies of an attic space.
Worse enemies of a healthy attic
Heat and moisture are the biggest culprits to an unhealthy attic. Heat leads to roof deterioration and higher cooling costs. Moisture leads to mold, mildew, wood rot and deterioration of insulation r-value.
Air tight homes need proper attic ventilation
Air tight homes
All of a home’s heat, moisture and condensation that used to escape through walls and windows are now building up under the roof!
One
Most neglected space
The attic is one of the most neglected spaces in a home. It’s dark, difficult to access and can easily be ignored as it is out-of-sight. It is time you stop neglecting this part of your home. Attics play a vital part in the health of your home.
Soffit intakes vents are the seond half to a properly vented roof to compliment the exhaust vents at the ridge
Cool air in, hot air out
That is the entire key to proper attic ventilation. The goal is to maintain uniform air movement across the entire length of attic from eave to ridge.

Helpful Resources for Homeowners

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EagleView Report
As a homeowner, you should be informed about your home as much as possible. EagleView Technologies invented and patented the technology behind 3D aerial roof measurements. You can order several different reports on your home but we recommend you consider the Premium report to add to your home's portfolio. This will give you very detailed information about your roof which as a homeowner, you can use whenever you are getting bids for a new roof, etc. They also offer reports good for gutters and even outer wall measurements for future siding or paint jobs.
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How many vents will you need on your house?

Page last updated: 11/7/17
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