Ice Dam and Snow Conditions
These are photos of ice dams and sliding snow conditions
on National Park Service buildings. Photographs were taken by Andy
Beck, Architect, National Park Service, United States Department
This photo depicts a severe ice dam on the right side of the house
the bottom edge of the roof. You can see snow movement down
roof of the building, which causes
therefore, there is no
or ice dam over the porch.
Photo of a snow-covered house with large icicles hanging from
which demonstrates the effects of uncontrolled drainage.
roof on this
building has caused an ice dam, snow buildup,
and piles of uncontrolled
the ground. Doors and
are blocked. When the snow melts,
walls will get soaked.
This photo demonstrates a classic poor building design for snow country.
The steep-pitched, hot roof that drains onto lower roofs is a disaster
There is ice dam buildup on the upper roof, and a subsequent
extra load on the lower roof. It is likely that the roof
is overstressed all winter long.