For those of you who do not know, roof ventilation requires a flow of air to work. Air flow in an attic can be created in two ways, either mechanical, which needs a source of power, or natural, which is the preferred method. A natural circulation of air is created with natural roof ventilation, when the stack effect and the wind effect work together.
The stack effect is when hot air rises creating a higher pressure at high points in the attic. Exhaust is the hot air that is released. Without the inflow of cooler, low pressure air, known as the intake, the hot air cannot escape. A well vented attic has a natural flow of air generated by the intake and exhaust.
Roof ventilation benefits?
Indoor temperature extremes are reduced
Have you ever noticed that upstairs is at least 10 degrees warmer than your living room? If you live in a ranch-style house, you may find that your feet are icy cold even though the air isn’t cool.
Roofs that are not properly vented are usually the reason for these temperature extremes. Once your roof is sufficiently vented, your home will be more comfortable all year round.
Cuts energy costs
The more the outside temperature increases, the more we prefer to stay inside to keep cool. A properly vented roof allows the heat to escape, which in turn reduces the air conditioner’s workload. The result of your air conditioner running less is a lower electric bill.
The life of your roof is extended
Icicle build up on the edges of roofs and gutters, referred to as ice damming, is a result of snow and ice melting and then refreezing again. A sure sign of a poorly ventilated roof. Damage to the whole roofing system, the attic and even your inside walls occurs when the accumulated water and ice start to creep under the roofing material.
With proper ventilation the warm air is released before it has a chance to melt the snow and ice on your roof. Well-ventilated roofs are easy to spot in the winter months because even though there is snow on the roof there are no icicles.