MOLD & MILDEW
Mold and mildew problems can be health hazards. Some mold and mildew problems occur because warm moisture travels through gaps and then condenses on cold surfaces. When left unchecked, it can cause wood to rot and may lead to respiratory problems for people with mold sensitivities and allergies. In short, it's a serious problem. Air-sealing and insulating all gaps between the attic and the living quarters with GREAT STUFF™ helps prevent mold growth and the potential for health hazards.
Icicles are pretty. But they can cause serious damage to a house over time. In a house that isn't properly insulated and air sealed, heated air escapes from the living areas to the attic. The roof warms. The snow melts and then as temperatures drop, the snowmelt refreezes as ice. Eventually, a small icedam can form, causing water to back up under the shingles and leak through the roof. So make sure the attic is well-insulated and seal areas where air can escape from the living area to the attic (e.g. attic hatches) with GREAT STUFF™.