Fan In Attic Ice Dam

There are two main purposes of attic ventilation.

Fan in attic ice dam. To protect against damage to your structure and to reduce energy usage. As long as attic air leaks are sealed and insulation is sufficient only small amount of ventilation are needed to keep the attic space cold. Attic ventilation is required by code but it s not an ice dam elixir. If your fan duct has loose insulation or it vents into the attic the warm air may create a warm spot risking an ice dam.

The whole reason your attic is hot in the first place is that there are leaks or poor insulation between your attic and your living space. Ice dams and attic fan. Although setting up fans in your attic will expel hot air they won t help you prevent ice dams. Attic ventilation is required by code but it s not an ice dam elixir.

Next a fan in the attic can help keep the cool air found in other area s of the attic circulating around to help counteract the heat and moisture coming up from below heating up the sheathing which is one of the main causes of ice dams. Ventilation during the winter helps to reduce moisture as well as keeps attics dry and at an even temperature. A third component to ice dams is attic ventilation. Originally posted by slstech.

As long as attic air leaks are sealed and insulation is sufficient only small amount of ventilation are needed to keep the attic space cold.