Likewise, ice dams can form when heat from the sun above or heat loss from the building below melts snow, which then drains to a shadowed point or eave line on the roof and freezes.
(ice dams; can form; heat from the sun above or heat loss from the building below melts snow) (the building below melts snow; drains; to a shadowed point or eave line on the roof and freezes; T:then)
ice dams the building below melts snow
can form drains
heat from the sun above or heat loss from the building below melts snow
to a shadowed point or eave line on the roof and freezes T:then