More Vents Attic

Rectangular roof vents installed on one side of the roof only.

More vents attic.

These fans may be controlled by a switch or a thermostat which detects heat build up in the attic space and automatically exhausts the attic space. Fans and vents may be installed on the roof system that will draw the air out of the attic space and exhaust it to the exterior. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. Soffit vents come in several sizes and styles including small round discs and rectangular grilles.

One method is to use a powered attic vent with a humidistat thermostat located close to the ridge or top of the roof. Intake vents located at the lowest part of the roof under the eaves allow cool. Figure 7 mechanical ventilation used with a hip roof. If not measure the size yourself.

Calculate 20 per cent more for 7 12 to 10 12 pitches and 30 per cent more for a pitch that is 11 12 or greater. The open area of a vent is sometimes listed on the roof air vent as nfva net free vent area. Good roof ventilation can do this but shingle color sun exposure and insulation are exponentially more important to overall energy efficiency than ventilation. This will help to avoid premature damage to the shingles or mold building up in moist hot.

Whole house fans powered attic fans. Of course there should be intake vents to ensure a balanced system. If the slope of your roof is greater than 6 12 you will need more ventilation to reflect the extra volume of attic space. And in many of these cases the hip roof forms a large volumetric attic space to ventilate.

These vents allow outside air to enter the attic at the lowest point of the roof along the underside of the eave. Sure installing roof vents for older homes can reduce your hot air during the summer but there are probably more low risk cost effective ways to increase your home s energy efficiency. They re most effective when used in conjunction with a continuous ridge vent. An attic fan works by exchanging the hot air in your attic space for fresh air pulled through the vents.

See the benefits of attic ventilation a new roof is more than just shingles. Effective attic ventilation systems reduce damaging heat and moisture in your attic promote energy efficiency by helping to reduce the load on your air conditioner in the summer and also reduce the risk of ice dam formation on your roof. Roof vents will provide about half of the vent area and soffit vents the other half. Rectangular roof vents work best when the wind blows over the top of them rather than into them.