本文发表在 rolia.net 枫下论坛What is an ice dam?
An ice dam is a ridge of ice that forms at the edge of a roof and prevents melting snow (water) from draining off the roof. The water that backs up behind the dam can leak into a home and cause damage to walls, ceilings, insulation, and other areas.
Dealing with ice dams
Immediate action:
Remove snow from the roof. This eliminates one of the ingredients necessary for the formation of an ice dam. A "roof rake" and push broom can be used to remove snow, but may damage the roofing materials.
In an emergency situation where water is flowing into the house structure, making channels through the ice dam allows the water behind the dam to drain off the roof. Hosing with tap water on a warm day will do this job. Work upward from the lower edge of the dam. The channel will become ineffective within days and is only a temporary solution to ice dam damage.
Long-term action:
Increase the ceiling/roof insulation to cut down on heat loss by conduction. State code requires an R-value of 38 above the ceiling for new homes. In narrow spaces, use insulation products with high R-value (6-7) per inch.
Make the ceiling air tight so no warm air can flow from the house into the attic space.更多精彩文章及讨论，请光临枫下论坛 rolia.net
An ice dam is a ridge of ice that forms at the edge of a roof and prevents melting snow (water) from draining off the roof. The water that backs up behind the dam can leak into a home and cause damage to walls, ceilings, insulation, and other areas.
Dealing with ice dams
Immediate action:
Remove snow from the roof. This eliminates one of the ingredients necessary for the formation of an ice dam. A "roof rake" and push broom can be used to remove snow, but may damage the roofing materials.
In an emergency situation where water is flowing into the house structure, making channels through the ice dam allows the water behind the dam to drain off the roof. Hosing with tap water on a warm day will do this job. Work upward from the lower edge of the dam. The channel will become ineffective within days and is only a temporary solution to ice dam damage.
Long-term action:
Increase the ceiling/roof insulation to cut down on heat loss by conduction. State code requires an R-value of 38 above the ceiling for new homes. In narrow spaces, use insulation products with high R-value (6-7) per inch.
Make the ceiling air tight so no warm air can flow from the house into the attic space.更多精彩文章及讨论，请光临枫下论坛 rolia.net