Ice dam formations.

Ice dams occur where the meltwater from heated areas and solar gain exits the snow, whether it’s at the bottom edge of a 3′ overhang, a 12′ overhang, even where there’s no overhang at all.  When snow is partially removed (for example, by shoveling or prompted by metal edging) the meltwater re-freezes at the new bottom edge of the snow creating a new ice dam.

Summit Ice Melt Systems prevents icicles and ice dams from forming.

1.  Here’s a covered walkway with a well developed ice dam that started at the eave, 10′ from heated area. The blanket of snow insulates the meltwater from solar gain and the heated area uphill until it re-freezes at the edge.  This ice dam will continue building until it eventually reaches the heated wall line:

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2.  Here’s a young ice dam starting 12′ from the heated area:

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3.  8′ wide covered walkway, ice dam at edge:

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4.  Here is a covered walkway where the meltwater drains under snow until it exits at the edge, where it begins forming ice 10′ from heated area of home:

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5.  Young ice dam forming along eave about 8′ from heated area. The heater cable is not doing its job:

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6.  Typical developing ice dams growing up the roof and over the edge into a heavy ice formation:

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7.  Summit Ice Melt Systems Radiant Edge ice melt system in operation with a heated gutter to ensure a safe handicap ramp access:

PRO in operation

8.  Ice dam forming at the edge of an 8′ overhang after travelling down under a thin, but insulating blanket of snow:

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9.  Ice everywhere, but note it all starts at the bottom edge of the roof, even on the 10′ overhang:

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 10.   Summit Ice Melt Systems’ Radiant Edge in operation in an extreme ice dam condition. Note adjacent unheated eave (see inset), with the same northern exposure, has developed a fearsome ice dam:

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11.  Fully developed ice dam. Ice started forming at the eave edge of this 3′ overhang and has grown up the roof.   This is when the ice dam ponds water from the heated area and is unable to drain-hence the name “ice dam.”   Time to worry about interior leaks: id112

12.  Another developed ice dam, but still growing.  It started along the drip edge of this 8′ overhang and had just made its way up to the heated garage area to the left: id111

13.  Ice forming on this gambrel roof where meltwater is exiting snow on upper roof, even re-freezing over heated living area:
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14.  This metal-edged eave enabled the ice and snow to fracture off the roof. Note new ice dam forming at the fracture line. The area where this ice dam forms is extremely vulnerable to leaks as it is where the roofing panels, shingles, transition flashing, exposed fasteners, etc. all meet, and often leak. Summit’s heated standing seam metal roofing prevents this. Partial roof shoveling, a dangerous and tedious task thought by some to prevent ice dams, simply creates another new ice dam up the roof.id117 
15.  Another metal-edged eave where ice and snow was released from roof. New ice dam forms where meltwater now exits the snow, all the way to the bottom of the roof. This is a very vulnerable location for an ice dam, where the busy transition of metal to shingles occurs:

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16.  A 12″ thick ice dam occurs at the snow fracture line along a metal-edged roof. Lots of components in this busy transition that can leak. Eventually this block of ice will drop off the roof too, perhaps taking some roofing shingles with it and damaging whatever is below on the ground/deck/driveway/walkway: id110


17.  New ice dam forming at the fracture line over living area where the snow naturally shed off this steep roof: id114
 
18.  Below is the second visit for this roof snow shoveler. Despite the use of heat tape, an ice dam formed completely along the roof’s edge and leaked. The shoveler then cleared the bottom 5′ of snow off the roof.  Consequently, a new ice dam re-occurred where he stopped shoveling. New roof leaks ensued higher up the roof, so then they decided to remove all the remaining snow to the ridge. The energized heat tape completely ineffective against all of these ice formations: id113