A poorly ventilated attic can cause attic mold and mildew, ice damming, temperature fluctuations inside your home, and deterioration. Keeping it in tip-top shape is important.
Maintaining adequate attic ventilation is essential for the overall health of you and your home. Without proper ventilation, you risk mold mildew growth, general deterioration of your roofing system, and even increased respiratory problems due to this moisture accumulation.
Natural Attic Ventilation
Proper insulation and air sealing also keeps attics cold in winter by blocking the entry of heat and moist air from below. In the summer, natural air flow in a well-vented attic moves super-heated air out of the attic, protecting roof shingles and removing moisture.
Poor attic ventilation can make attics extremely hot in warmer months. This heat can seep into your living spaces, forcing your air conditioning system to work harder. As a result, you'll see higher energy bills and a shorter lifespan for your HVAC system.
In the long run the solution is to have good air sealing and insulation between the attic and the living space, in addition to ventilation. You also want to do as much as you can to get your ductwork well-sealed and on the conditioned-space side of the insulation.
If your attic fan no longer works, heat in the summer and moisture in winter can build up and cause damage to your house and any stored items. To repair an attic fan near you, you can pay between $200 and $430, with an average price of about $300.
If you suspect your attic has ventilation problems, the first step is to call a local roof repair pro for an inspection. Professional roofers will inspect the attic and roof for damage and discuss options for improving ventilation and repairing any existing damage.
When your attic isn't properly ventilated, your roofing system can suffer considerable damage. If your home is protected with asphalt roofing shingles, you may notice your shingles begin cupping, buckling, or blistering if they're experiencing too much heat from your attic.
Incorporate Under-Eave Vents
Also known as soffit vents, under-eave vents are crucial for drawing in fresh air and setting up the cyclical air flow necessary for optimal attic ventilation. They work hand in hand with ridge vents. As fresh air enters through the soffit, it pushes out the hot air via the ridge vents.
What About Homes That Don't Have Attics or Crawlspaces? Many homes have vaulted ceilings without an attic space. Homes without attics or crawlspaces are surprisingly common, including in low-slope or flat-roof homes. However, just because there is no attic space doesn't mean you don't need ventilation.
Common Over-Ventilation Problems
Too much ventilation can work against the airflow of your attic because having too many vents can cause them to start to work against each other. If the wrong types of vents are installed, these can also work against each other in a way that moisture or frost can regrettably develop.
According to the International Residential Code (Section R806. 2) and International Building Code (Section 1202.2. 1), attics require a minimum of 1/150 of NFA but can be reduced to 1/300 if certain conditions are met.
Insulating your home and making it airtight without proper ventilation creates a reduced indoor air quality. Fresh air does not enter and stale air is not removed to the outside. The consequences are: Increased risk of respiratory diseases such as asthma and allergies.
A vented attic can heat up to 130 degrees in the summer, causing your HVAC system to work much harder than necessary. Unwanted moisture can also form as the result of condensation. These problems can be solved by applying spray foam insulation to the underside of the roof deck.
Persistent Odors: Homes should refresh and clear out odors naturally through proper ventilation. If cooking smells, smoke, or other odors last longer than they should, it's likely your home isn't circulating air properly.
Proper roof ventilation is essential to protect your home from moisture damage and keep your roofing materials from premature failure.
Attic fans range differently depending on what kind of the Attic fan you are installing, you can expect to pay between $350 to $1,000 installed. The pricing varies based on the type of Attic fan, the sizing requirements, and the motor type.
Roofing contractors are accustomed to inspecting attics, measuring the size of the attic for the amount of ventilation needed, installing intake vents, installing exhaust vents, and making roofing repairs that may be needed.
On average, homeowners can expect to pay anywhere from $15 to $150 per vent for replacement, depending on the abovementioned factors. Trained technician vent replacements, such as simple plastic floor vents, may be on the lower end of this range, while custom metal or wood vents can be on the higher end.
An attic fan that won't turn on is usually an electrical problem, but it can also be an issue with the fan motor or the thermostat. First, check the circuit breaker that controls the attic fan.
You can expect your attic fan to last between 10 - 15 years before needing its motor replaced.