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is that they help to reduce the chances of ice dam formation on the roof. Ice dams occur when heat leaks from the conditioned space (through holes in the ceiling plane, insufficient insulation, or heat loss from ductwork) and melts the snow on the roof. This melted snow travels down to the edges

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Pipe Leak Galvanized Steel Pipe Leak Gutter Defects Gutter Defects High Mold Zone Ice Dam Ice Dam Improper Installation of Vapor Retarder Interior Moisture Sources Interior Rim Joist Insulation Interior Rim Joist Insulation Moisture Accumulation Moisture Accumulation Moisture Inspection Moisture

inch high, nailed at 18 inches on center, and not more than 1 inch from the outer edges. Ideally, this would also have a layer of ice and water shield installed under the flashing, extending the flashing protection to 18 inches on either side of the valley. In both cases, it is good practice to also

and Air Leakage Gas Service Line and Outdoor Meter Gas Service Line and Outdoor Meter Glazing Putty Heat Transfer Hidden Insulation ICAT-Rated Fixture ICAT-Rated Fixture Ice Dam Ice Dam Infrared Camera Inspection Insulated Attic Hatch with Blown Insulation Insulated Floor and Air Barrier Insulated Floor

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of insulation in crawl spaces, attics, and unconditioned spaces, with specific attention to vapor barriers, R-values, and ventilation requirements. Andy also addressed the importance of proper ventilation and insulation in preventing condensation and ice dam formation on roofs. Roof Ventilation and Moisture

and Very Cold Climates:  Depending on the building codes for the jurisdiction, it may be wise to avoid the use of gutters in areas that receive high snow loads.  If gutters are installed, ice buildup inside the gutters during freezing and below-freezing temperatures can lead to ice damming, which can

for Home Inspectors by Nathan Thornberry - Author of "the Hungry Home Inspector" and owner of Residential Warranty Services Water Leakage from from ice dams and moldy attics: Why warm air bypass trumps attic ventilation by Mark Meiling of Foresight Home Performance Basement Problems and Repairs - Chris

exposure to heat; and  ice dams are more likely to form at unvented attics in cold climates. Inspectors and homeowners should understand that unvented roof assemblies are a controversial idea. The Asphalt Roofing Manufacturers Association (ARMA), for instance, has argued that the IRC's acceptance