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ATTIC VENTILATION IS ESSENTIAL
A proper attic ventilation system MUST be installed to:
 | Validate the new shingle warranty. |
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| Help protect the attic from damage caused by excess heat in the summer and moisture in the winter. |
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| Help shingles and roofing materials last longer. |
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| Help prevent the formation of ice dams in cold climates. |
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| Must provide free flowing air under the entire roof deck for optimum results. |
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| 1 sq. ft. of free vent air for each 150 sq. ft. of attic floor space is required. |
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| Half the openings at the ridge to provide exhaust ventilation, and half
the openings in the soffit or under eaves for intake ventilation. |
The proper and most efficient way to ventilate an attic is to install
continuous
soffit or
eave vents for proper intake air and continuous ridge vents for
proper
exhaust ventilation.
The soffit vents
should not be blocked with insulation or
other materials at the eave.
Insulation baffles may have to be installed at the eaves to
hold the
insulation
away from the roof sheathing. If you are installing or have installed
aluminum vented
soffit materials, make sure to cut large enough openings in the
existing soffit boards
to allow the air to enter the attic from the soffit.
Intake Vents
Continuous Soffit Vents
These continuous vents install in your soffit or eave areas.
Undereave Vents
Available in white, brown or mill finish, these units provide
venting specifically at the eaves.
Vented Drip Edge
Combines a drip edge with intake vents for homes with
little or no soffit.
NEW
- The Edge™ Vent
Shingle-over roof-top installed intake vent for homes
with little or no soffit.
Ridge Vents
The ridge vent should also be continuous and should have a baffle to direct
wind
blown air over the ridge vent and not into the attic, which would prevent
the
ventilation from operating.
Note: Most mesh, shingle over ridge vents do not operate efficiently when the
wind is
blowing outside from a 5 mile per hr. wind and up.
ShingleVent®II
Multi-Pitch FilterVent®
Maintain Proper Attic Ventilation
|
To maintain the most efficient attic ventilation, make sure that your bath,
kitchen and dryer vents are not routed into the attic, but instead go directly to the exterior. |
| Never block off your attic ventilation in the winter, since
moisture generated inside the house that rises to the attic can cause more problems in the winter than in the summer. With insulation between the attic floor and the house ceiling below, there will be no heat losses and the ventilation will not lower the temperature in the house. |
| When you install proper Ridge vents and Soffit/eave vents any gable vents
should be closed. Gable vents can short circuit the ventilation system by drawing air through the gable vent, due to the fact that it is closer to the ridge vent than the soffit/eave vents. |
| Insulation baffles may have to be installed at the eaves to prevent the
insulation from blocking the air flow from the eave vents into the attic. |
| Proper ventilation is also critical in the summer, especially if your
Central Air Conditioning System or any duct work is installed in the attic. An improperly vented, hot attic can cause the system to run continuously, increasing operating costs due to the high attic heat and cooling losses from the thinly insulated attic ductwork. |
Foundation/Crawl Space Vents
Crawl spaces should be vented to permit water vapor to escape. However,
if the floor
above the crawl space is not insulated you might want to close
off the vents to reduce
the cold air in the winter from entering the crawl
space and making the floor cold.
If you have eliminated the possibility of
water
penetration in heavy rains, maintained a
proper slope away from the
house,
extended the downspouts away from the walls,
installed an acceptable
ground
cover, (6 mil polyethylene or concrete) and the crawl
space is not
insulated the
vents should be closed.
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Powered Foundation Vent
Automatic Foundation Vent
Manual Foundation Vent |
Foundation vents help remove moisture that can lead to damp rot and eventually costly damage, as well as attract termites. |
Ventilation Link www.airvent.com
