Poor Attic Ventilation Can Ruin Your Insulation, Destroy Your Shingles, And Potentially Raise Your Energy Bills!

Proper attic ventilation systems allow a continual flow of outside air through the attic, protecting the efficiency of the insulation and helping to lower temperatures in the living space.

It consists of a balance between air intake (at your eaves or soffits) and air exhaust (at or near your roof ridge).

The U.S. FHA (Federal Housing Administration) recommends a minimumof at least 1 square foot of attic ventilation (both intake and exhaust) for every 300 square feet of attic space. For example, if your attic is 900 square feet, you need a total of 3 square feet of ventilation. This amount should be divided equally between intake and exhaust ventilation (i.e., 1 1/2 feet of each) to insure proper air flow through the attic. To calculate the amount of ventilation you need for your home, visit GAF’s Ventilation Calculator.

Why Take Risks?

Many homes in North America do not have proper attic ventilation. Why? Because most people are unaware that attic ventilation can impact the longevity of their entire home!–

In the summer, improper ventilation can cause attic heat to build in excess of 160°F. This super-heated air eventually penetrates the ceiling insulation into the living area below.

Types of damage that can result include:
  • Premature aging of your roofing system (“fried” shingles)
  • Warping, cracking, or breaking down of wood framing
  • Damage to siding, exterior or interior paint, and wallpaper

A properly ventilated attic can help reduce the load on your air conditioner by moving the super-heated air out of your attic before it builds up and causes damage.

In the winter, various household appliances, bathtubs, showers, and cooking vapors can contribute to excess moisture build-up. Improperly ventilated attics will allow this moisture to collect and cling to the underside of the roof. The moisture will condense and fall, soaking the attic insulation and reducing its efficiency.

Additional structural damage can include:
  • Roof deck warping and rotting of the wood frame
  • Mildew growth
  • Buckling of shingles and felt

Finally, attics should be properly ventilated to help prevent ice dams in cold northern climates. During the winter, ice and snow on a roof will melt and run down the deck to the cooler eaves. This run-off can re-freeze, creating an ice dam that may force water back up under the shingles and leak into your home — causing hundreds or thousands of dollars of damage to your ceilings and walls. Adequate attic ventilation reduces the amount of initial melting that occurs on your roof, thereby reducing the chance that ice dams will form.

Cobra Exhaust Vent
Cobra® Exhaust Vent
The original Cobra®Ridge Vent — protects over 2 million homes!
Cobra Snow Country
Cobra® Rigid Vent 3™ (Attic Exhaust Vent)
Premium rigid-style vent — available in warmer climates. Includes 3″ ring shank nails for easy installation.
Cobra Ridge Runner
Cobra® Ridge Runner® (Attic Exhaust Vent)
The performance of a baffled rigid vent… with the ease of a roll!
Cobra Snow Country
Cobra® Snow Country™ (Attic Exhaust Vent)
Quality rigid-style vent. Snow Guard filter helps resist snow infiltration. Available in colder climates.
Cobra Snow Country Advanced
Cobra® Snow Country™ Advanced (Attic Exhaust Vent)
Premium quality rigid-style vent. Snow Guardfilter helps resist snow infiltration. Includes 3″ ring shank nails for easy installation. Available in colder climates.
Cobra Hip Vent
Cobra® Hip Vent (Attic Exhaust Vent)
Safe and effective exhaust ventilation for homes with little or no ridge.
Cobra Fascia Vent
Cobra® Fascia Vent (Attic Intake Vent)
Allows you to add attic intake ventilation when you have no soffits.
Cobra FasciaFlow Vent
Cobra FasciaFlow® (Attic Intake Vent)
Allows you to add attic intake ventilation when you have no soffits.
Cobra FasciaFlow Vent
Cobra® IntakePro (Attic Intake Vent)
Allows you to add attic intake ventilation when you have no soffits.

Master Flow® Attic Ventilation & Accessory Products

(not covered under Lifetime Roofing System Warranty)

Master Flow Roof Louvers
Master Flow® Roof Louvers (Attic Exhaust Vents)
A complete line of quality options for those who prefer roof louvers (or where existing roof louvers are being replaced).
MasterFlow Solar-Powered Roof Vent
Master Flow® Green Machine™ High-Power Solar Roof Vent – Available in Solar & Dual-Powered Models (Attic Exhaust Vent)
Helping to reduce attic cooling costs, this next generation vent combines increased airflow with excellent aesthetics
MasterFlow Solar-Powered Roof exhaust Vent
Master Flow® Green Machine™ Solar-Powered EcoSmart Roof Vent (Attic Exhaust Vent)
Removes damaging heat and moisture from your attic… without the need for an electrical connection.
Master Flow Power Roof Ventilators
Master Flow® Power Attic Ventilators – Roof Mount (Attic Exhaust Vents)
Help exhaust the greatest volume of hot and/or humid air from the attic vs. conventional attic exhaust vents.
Master Flow Power Gable Ventilators
Master Flow® Power Attic Ventilators – Gable Mount (Attic Exhaust Vents)
Typically the easiest power vents to install and will not detract from the look of the finished roof.
Master Flow Rotary Turbine Vents
Master Flow® Rotary Turbine Vents (Attic Exhaust Vents)
Designed with upper and lower stainless steel bearing systems for years of trouble-free operation on the roof.
Master Flow Green Machine Dual Powered
Master Flow® Green Machine™ Dual-Powered EcoSmart Roof Vent (Attic Exhaust Vent)
Removes damaging heat and moisture from your attic whether the sun is out or not!
Master Flow Solar Powered Roof Intake Booster
Master Flow® Green Machine™ Solar-Powered EcoSmart Ridge Vent (Attic Exhaust Vent)
Provides increased airflow over typical ridge vents, turbines, and roof louvers to help reduce hot or moist air in your attic.
Master Flow Aluminum Ridge Vents
Master Flow® 10′ Aluminum Ridge Vent (Attic Exhaust Vent)
Made of durable aluminum construction with built-in baffle for reliable performance on the roof.
Master Flow Soffit/Undereave Vents
Master Flow® Soffit/Undereave Vent (Attic Intake Vent)
Easy-to-install options for providing critical attic intake ventilation at the soffit or undereave areas of the roof.
Master Flow EmberShield
Master Flow®EmberShield® (Attic Intake Vent)
Closeable soffit vent helps prevent wildfire embers from being drawing into the attic.
Master Flow Solar Powered Roof Intake Booster
Master Flow® Green Machine™ Solar-Powered Intake Booster Vent (Attic Intake Vent)
Perfect for houses with insufficient soffit ventilation.  Installs without an electrical connection
Master Flow Gable Louver
Master Flow® Gable Louvers (Intake or Exhaust Vents)
Flush and recessed-mount vents for gable wall and other hard-to-ventilate areas.
Master Flow Foundation Vents
Master Flow® Foundation Vents (Foundation/Crawl Space Vents)
Solutions to help remove damaging moisture from the foundation area of the home.
Master Flow Whole House Fans
Master Flow® Whole House Fans
Smart energy savers for any climate where air conditioning costs are a concern.
MasterFlow Chimney/Roof Caps & Other Accessories
Master Flow® Roof Caps & Other Accessories
A wide array of goose neck vents, roof caps, jacks, and flashings, as well as moss and mildew preventers and other accessories.
Master Flow Safety Caps for Chimneys
Master Flow® Safety Caps for Chimneys
Provide protection against dangerous sparks while reducing downdrafts, clogging, soot, and creosote build-up.

1-800-RITE-ROOF has been installing Roofing, Siding, Gutters, Ventilation, Insulation, windows & Doors since 1996 in Waukesha, Milwaukee and all around southeastern Wisconsin. Call us today for a no obligation free inspection and written estimate at (262) 373-3800.

Serving Milwaukee – Waukesha – Brookfield – New Berlin – Franklin – Racine – Shorewood – Greenfield – Grafton – Pewaukee – Oconomowoc – West Allis and the surrounding communities in southeastern Wisconsin