Ac Problem Fan Is Running But No Air Flow Roof Ventilation – Installation, Importance, and Costs

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Roof Ventilation – Installation, Importance, and Costs

Before we delve into how much roof ventilation costs, let’s look at its importance. When roofs are built without air intake and exhaust vents, heat from the sun can cause warm air to accumulate in the attic. This heat can spread to other parts of the house, making indoor conditions unbearable in summer. On a normal daytime heat of 90°F, temperatures can rise to 140°F when airflow is poor. In addition to heat, the presence of moisture in the attic can cause serious problems in the future if proper venting is not installed.

Shingles and roof decking can suffer and deteriorate prematurely. Radiant heat can also mean that air conditioning units and other cooling units have to work harder to keep temperatures down, ultimately increasing electricity bills.

Revealing how vents work

There are advantages to having a fully functional ventilation system throughout the year. Roof vents work by allowing air to move freely from one point of the roof to another. This ensures that moisture and heat are not transferred outside the roof, keeping the house cool. These systems usually consist of several components systematically placed for optimal functioning. This air movement can be done in two different ways: mechanical and natural. Natural air movement is driven by stack or wind effect. Meanwhile, mechanical vent systems use electrical motors.

Mechanical systems are the most effective. A power system can effectively transfer hot air out and cool air in. However, this type of venting solution has some tradeoffs. First, some fans require more than 100W of power to run. This can increase your electricity bill significantly. Installation is also more complicated and, in most cases, may require professional help. There are also solar powered fans that allow off-grid operation but are a bit expensive.

How much roof ventilation do I need?

Having enough air flow in your attic will keep your electricity bill low during the summer. Exhausting hot air not only cools the entire home, but also protects the roof structure from moisture damage. However, most homeowners are oblivious to how much air flow they need in their homes. It is best to know how much you really need. This is to ensure that you have enough airflow to keep the temperature in your attic relatively tolerable.

Knowing how much ventilation you need for your attic is relatively easy. Generally, you will need 1 vent area (about 1 square foot in size) for every 150 square feet. Assuming your attic has about 450 square feet of space, you will need to install at least 3 ceiling vents.

The recommended allocation of vents is 60% and 40%. 60% of the vents will be in the soffit area and as mentioned in the example above, 2 soffit vents should be installed. The other 40% is for ridge vents. The type of ventilation can depend on the climate as well as your preferences. If you are still unsure, you should consult a professional to get a second opinion.

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