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Roofing Contractor Indianapolis

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Serving Indianapolis and Surrounding Areas Since 1994!



Bone Dry Roofing Attic Ventilation





Proper ventilation is critical to every roofing system. Vapors and condensation can be highly detrimental to your attic's insulation, while also potentially promoting structural decay in the building itself. ABC Roofing’s trained and experienced personnel will ensure that your home has proper ventilation in order to best promote the longevity of your roofing system and home.


It is estimated that over 85% of homes in the U.S. lack proper attic ventilation. This is simply because most people do not know of the extreme importance of proper attic ventilation.


Poor insulation can result in the build up of heat in the summer; allowing heated air around 160°F to spread down into other areas of your home—but this is just one way in which poor insulation affects homes.


Improper insulation tends to bring all types of problems, including:


* Reduced lifespan of the roofing system

* Advanced decay of wood framing

* Destruction to interior & exterior paint, siding and wallpaper

* Higher energy costs


Inadequate ventilation can increase the load on your A.C. unit by allowing

superheated air to build up and cause damage. During the wintertime, steam

from showers & bathtubs as well as vapors from cooking create moisture

build-up. This build-up can accumulate on the underside of your roof, where it

will condense and eventually find its way into your attic; soaking the insulation

and hurting its performance.


Furthermore, poor insulation can result in:


* Warping of your roof deck & rotting of wood frame

* Mildew growth

* Increased strain on shingles and felt


Ice dams pose yet another threat to poorly insulated roofing systems. Ice and snow melt and enter the cooler eaves on the roof—refreezing and creating a blockage that tends to trap moisture. This build-up can eventually accumulate under your shingles; entering your home and causing damage to your ceilings and walls—resulting in up to thousands of dollars in repairs. Proper ventilation reduces the initial melting at the roof-level; combating the formation of ice dams.


Proper Attic Ventilation


Adequate attic ventilation systems allow a constant flow of outside air through the attic (refer to above illustration), promoting the efficiency of the insulation and helping to lower temperatures in the living space.


A healthy roofing system utilizes a good balance of air intake (at the eaves or soffits) and air exhaust (around the roof ridge).


A minimum of 1 square foot of ventilation for every 300 square feet of attic space is recommended by the Federal Housing Administration. Thus, a 1200 square foot attic should have 4 square feet of ventilation. The ventilation should be symmetrically split between intake and exhaust ventilation to best allow for proper air flow through the attic.


8499 E. US Hwy 36 Avon, IN 46123 (317) 228-9882

Ventilation and Insulation Indianapolis

Products & Information: Ventilation

Attic Ventilation