A properly installed self-adhered underlayment is a final defense against ice damming. This tear-resistant, waterproofing product seals tight around nails. It helps prevent water overflow from entering exterior walls or the attic where it can saturate the floor insulation, ruin the drywall underneath or get into the interior walls.
Read more about Ice & Water Barriers for Your Roof.
Humidity, generated from your living area or from outside, that enters a cool attic condenses into a liquid when it meets colder surfaces.
Over time, that moisture can cause deterioration of the roof system and interior structural elements or ruin the attic insulation. In a warm attic, the moisture can allow mold and mildew to flourish and put added strain on the home’s cooling equipment.
Spotting the Signs of Improper Ventilation
An inadequate attic ventilation system can cause a variety of problems that manifest themselves in different ways.
Here are some subtle and some not-so-subtle things to watch out for:
- An unexplained uptick in your household heating and cooling bills, which can happen if your attic insulation gets wet and loses its effectiveness
- More frequent HVAC repairs as heating and cooling equipment that’s under a heavier workload can become more prone to breakdowns or even premature failure
- A noticeable buildup of ice along your roof edge during the winter months
- A wavy or rippled appearance to your home’s roofline and shingles that’s caused by warping of moisture-damaged decking underneath.
- Rust and corrosion on metal materials in the attic, such as nail heads, electrical boxes, light fixtures, and HVAC system components
- Dampness, water stains or frost on the attic side of your roof sheathing, or any evidence of deterioration and decay of the roof’s structural supports
- An increase in discomforting allergy symptoms or respiratory illnesses among your family members, which may be related to the spread of fungi spores through your indoor air supply from mold growth in your attic.
If you decide to check for these signs on your roof or in your attic, be sure to keep safety in mind. Instead of climbing up on the roof, walk around the outside of your home and look up from ground level using a pair of binoculars. If you head up to the attic, make sure the space is well-lit, that you have a sturdy walking path, and are wearing appropriate protective gear.