Ridge Vents - Ridge vents are a very efficient form of static exhaust vents and they are relatively inexpensive. They are installed over a slot that is cut in the ridge of the roof that runs the entire length of the ridge. Our ridge vents have an external baffle that draws air from the attic space, regardless of the wind direction and force. We use a special installation procedure that prevents wind driven rain or snow from entering the attic area via the vents.
We install two styles of ridge vents: shingle-vent, with ridge cap covers and metal ridge vent. However, the majority of our customers prefer shingle vents, because of how attractive a roof finished with shingle caps appears.
NOTE:When the roof as-built permits, we will install ridge vents on roofs that doesn't have adequate ventilation, including houses with gable-end vents. When we determine that an existing exhaust ventilation systems is not adequate and/or a ridge vent system can not be installed, we will recommend the additional components that should be installed and their cost. The type of vent that you want installed is up to you; however, I will advise you of what it might impact (eg,. warranties)
Soffits Vents - Soffits vents are installed under the roof eaves. Air that is used to cool the roof is drawn into the soffit vents and exhausted via ridge vents or other vents that should be installed on a roof.
Vented Drip-Edge - Vented drip-edge can be added to an existing roof system to provide intake ventilation where ordinary soffit vents are not installed. They are installed at the eaves in place of conventional drip-edge.
Edge Vents - Edge vents are installed to provide intake ventilation for homes with little or no overhang. It is a roof-top installed vent that can be used to supplement existing soffit or undereave vents. A single 4 foot lenght provides 9 square inches of net free area per linear foot to balance with ridge vent.
Attic ventilation might seem like a minor consideration, but properly installed, it can extend the life of your homes' attics and roof structures -- saving homeowners hundreds of dollars in repair costs.
During warmer months, ventilation helps keep attics cool. It helps prevent hot, moist summer air from warping the roof sheathing. It also stops shingles from deteriorating prematurely. What's more, fresh air in the attic makes a home much easier to cool, which can result in lower energy costs.
During the Winter months, ventilation helps reduce moisture to keep attics dry. It stops water from backing up under shingles, damaging insulation, and rotting the roof structure itself. It also helps prevent ice dams from forming. Ice dams occur in areas where snowfall and cold temperatures are common and pose a special problem because they prevent melt water from running off the roof. They can even cause leaks inside the home, resulting in drywall damage.
Roof Louvres - Roof louvres or roof pots are another popular style of exhaust vents. Roof louvers are installed at equally spaced intervals, near the ridge of the roof. They are available in round, square and slanted-top configurations. They provide a continuous flow of most of the underside of the sheathing, albeit not a uniform flow. Because of their individual exhaust areas, several vents may be needed to satisfy the recommended ventilation area.
Gable Wall Louvres) Gable wall louvres are installed in the gable ends of a house. Many builders install them, more for decorative purposes and pay little attention to their performance as effective ventilators. They do not perform as good roof ventilation systems.
Cupolas - Cupolas are another form of static vents. They are decorative vents that straddle the ridge of a roof and are installed over a hole that is cut in the roof sheathing at the ridge of a roof.
Vent Disks - An alternate in-take ventilation system that home owners can install are disk inserts that have a screen built-in. They are installed in holes bored in the un-ventilated soffits. The quantity of disks can be large, because their combined ventilation area must equal 1/300 times the attic area to be ventilated to be effective. And, their area is only about 10 in2; so, many will be required.
Wind Driven Turbine Vents - Wind driven turbine vents employ a series of specially shaped vanes that spin creating a negative pressure that sucks the air from the attic space. They require a wind velocity of at least 5 mph to be effective. When not spinning, they act as static vents. Like static vents, they must be installed equally spaced and near the ridge to prevent hot spots from developing in the roof.
Power Vents Power vents are similar to wind turbines, except that their rotating vanes are driven by a high efficiency motor and controlled by a thermostat and/or a humistat, to exhaust air from attics. Depending on their design, power vents can move as much as 1500 cubic feet of air per minute. For optimum performance, multiple power vents should be installed. They are especially effective on hip roofs where non-powered ventilation systems are not.
Electric-powered attic vents use a thermostat to fight heat and a humidistatto help prevent moisture buildup inside the attic. Featuring a low-profile dome, the power roof vent is unobtrusive when installed on the roof face slanting away from the front of your home. It's an efficient option to replace wind driven turbines already in place.
Whole House Fans - This ventilation system is used to draw air into a house from the outside and exhaust hot air. The fan and it's shuttered assembly is mounted in the ceiling of, usually the upstairs hallway, with it's output into an attic space that is vented. The principle function of a whole house fan is to help reduce the cooling load on the home's air conditioning system.
Intake Booster Vents - Intake booster vents promote greater airflow through a ventilation system by forcing supplemental air into the attic space and out through existing exhaust vents. They are installed near the eaves. They do not replace the necessity for soffit vents. Some versions of these vents are solar powered and do not require any power from the electrical system or an electrician to install them.
Booster Exhaust Vents - Booster exhaust vents install from inside the attic against the underside opening of standard roof vents up to 11 sq. in. They boost ventilation by over 3 times that of passive roof vents, helping to keep the upper roof deck below 32(F) during below freezing weather.
They are available in various sizes and designs. Their main problem is that they are high maintenance. And, they can become a home for birds, bats and even squirrels, when their protective screen is compromised.