Fan In Attic Ice Dam

If you push hot air out of your attic more hot air from inside your home will just rush in and take its place.

Fan in attic ice dam.

A third component to ice dams is attic ventilation. Originally posted by slstech. To protect against damage to your structure and to reduce energy usage. There are two main purposes of attic ventilation.

Ice dams and attic fan. Although setting up fans in your attic will expel hot air they won t help you prevent ice dams. The warm spots on the roof melt snow and the meltwater flows down to colder areas freezes and forms a dam. Attic ventilation is required by code but it s not an ice dam elixir.

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. Ventilation during the winter helps to reduce moisture as well as keeps attics dry and at an even temperature. 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. Proper attic ventilation can prevent ice dams.

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.