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Thread: Icicles

  1. #1
    Join Date
    Jun 2010
    Location
    Chelmsford, Mass
    Posts
    10

    Default Icicles

    I added about 10 inches of insulation to my attic (now have about 18 inches) and I still have a large amount if icicles on the edge of my roof. I don't think my attic is well ventilated. Could that be why I have so many icicles with all that insulation?

  2. #2
    Join Date
    May 2008
    Location
    Pacific Northwet
    Posts
    1,675

    Default Re: Icicles

    Attic ventilation serves two purposes: removal of humidity and equalization of temperature.

    If you don't have adequate ventilation, your attic will be warmer than freezing and will cause melting of snow on the roof. When the meltwater reaches the overhanging eaves, it either refreezes causing an ice dam, or drips causing icicles. In order to prevent this, the attic must remain below freezing, or nearly so.

    (Well, technically, it's the roof surface that must remain below freezing. The attic can be somewhat warmer. But if the attic is too warm, that will prevent the roof surface from maintaining a subfreezing temperature.)
    The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.

  3. #3
    Join Date
    Jun 2010
    Location
    Chelmsford, Mass
    Posts
    10

    Default Re: Icicles

    Thanks. Improved ventilation is what I will attack first in the Spring.

  4. #4
    Join Date
    Feb 2011
    Posts
    11

    Default Re: Icicles

    An icicle is a spike of ice formed when water dripping or falling from an object freezes. Typically, icicles will form when ice or snow is melted by either sunlight or some other heat source (such as heat leaking from the interior of a heated building), and the resulting melted water runs off ...

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