Ice, Ice Baby
Keep reading to learn more about how ice dams form so that you can prevent them altogether or make a quick fix if they’ve already formed.
TOH Tip: To keep ahead of water damage, snap photos where you see frosty buildup. Use the pictures to help target an interior inspection, during which you should check for leaks.
Fast Fix: It’s Nice to Deice
Next up, a list of long-term fixes that will help you get rid of your ice dams for good.
By taking care of common trouble spots, listed here in order of priority, you should enjoy dam-free winters and use less energy to boot:
1. Ventilate Eaves And Ridge. A ridge vent paired with continuous soffit vents circulates cold air under the entire roof. Both ridge and soffit vents should have the same size openings and provide at least 1 square foot of opening for every 300 square feet of attic floor. Place baffles at the eaves to maintain a clear path for the airflow from the soffit vents.
2. Cap the Hatch. An unsealed attic hatch or whole-house fan is a massive opening for heat to escape. Cover them with weatherstripped caps made from foil-faced foam board held together with aluminum tape.
3. Exhaust to the Outside. Make sure that the ducts connected to the kitchen, bathroom, and dryer vents all lead outdoors through either the roof or walls, but never through the soffit.
4. Add Insulation. More insulation on the attic floor keeps the heat where it belongs. To find how much insulation your attic needs, check with your local building department.
HOW-TO VIDEO: Insulate Your Attic in a Weekend
5. Install Sealed Can Lights. Old-style recessed lights give off great plumes of heat and can’t be insulated without creating a fire hazard. Replace them with sealed “IC” fixtures, which can be covered with insulation.
6. Flash Around Chimneys. Bridge the gap between chimney and house framing with L-shaped steel flashing held in place with unbroken beads of a fire-stop sealant. Using canned spray foam or insulation isn’t fire safe.
7. Seal and Insulate Ducts. Spread fiber-reinforced mastic on the joints of HVAC ducts and exhaust ducts. Cover them entirely with R-5 or R-6 foil-faced fiberglass.
8. Caulk Penetrations. Seal around electrical cables and vent pipes with a fire-stop sealant. Also, look for any spots where light shines up from below or the insulation is stained black by the dirt from passing air.
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