ICE DAMSThis mini-workshop What are ice dams?is presented by theGreen Needham What causes ice dams?Collaborative andNext Step Living. What are the consequences of ice dams? How are ice dams prevented? The role of air sealing The role of insulation The role of ventilation Myths about ice dams First step…
CAN ICE DAMS BE PREVENTED? There is no perfect solution to prevent ice dams. With the proper preparation, ice dams can be reduced, and in some cases eliminated entirely. http://greenhomesamerica.files.wordpress.com
WHAT ARE ICE DAMS?Home in Sudbury last winter. How can they be identified? Icicles hanging off of an eave of a house are the main indicator of ice dams. The larger the icicle, the larger the ice dam.
WHAT ARE ICE DAMS?1. Indoor heat lossthrough attic, cathedralceilings and transitionsbetween walls and theroof.2. Melting water flowsdown the roof towards theeave.3. An ice dam is formed.4. Water builds upbehind the dam andseeps into your home. www.aquaguideinc.com
WHAT CAUSES ICE DAMS?www.homeperformancetechnologies.com
AIR SEALINGThe Mass Save HomeEnergy ServicesProgram rebates airsealing.• 100% rebated• Thermadome• Vapor barrier for dirt crawl spaces
INSULATION Rebated under the Mass Some Home Energy Services Program • 75% off – up to $2,000 - per year • R-38 – 11 inches – of insulation • Dense pack under floored attics
VENTILATIONVentilation isrebated as partof theweatherizationcontract underthe Mass SaveProgram.-Vents-Insulated bath fanhoses
STRUCTURAL REALITY Due to the design of certain homes, eliminating ice dams will be very difficult. Cathedral ceilings Cape Cod homes are more prone to ice damming due to convective heat loss in transitions and sloped ceilings. greenhomesamerica.files.wordpress.com
MYTHS ABOUT ICE DAMS Myth: Ice dams can be prevented by slide sheets and electric coils. Fact: While both of these solutions have been said to work anecdotally, neither actually address the real problem. www.buildingscience.com www.buildingscience.com
MYTHS ABOUT ICE DAMS Myth: Ice dams are related to the gutters. Fact: Gutters do not necessarily cause ice dams, although they can be severely damaged by ice dams by extending the frozen layer of ice beyond the eave of the roof, putting excessive stress and weight on the gutters.www.icedamcompany.com
MYTHS ABOUT ICE DAMS Myth: Raking the snow off the roof is a great way to prevent ice dams. Fact: Raking the snow off of your roof can be very dangerous and cause significant damage to the shingles. If you don’t have ice dams, the layer of snow that builds up on the roof is actually a great insulator.http://bladeworkz.com
FIRST STEP… Visit www.greenneedham.org to learn more about energy efficiency and no-cost Mass Save home energy assessments.