Heat transfer during winter use is most likely causing the snow melt and ice.
Snow melt on roof around chimney.
Gaps around the chimney or vents allows water from melting snow or rain to leak into your home.
These includes stack and plumbing vent pipes stove and chimney pipes other pipe covers and any other type of pipe that sticks out of the roof.
Although this rule isn t ironclad it s ideal if the entire roof is well ventilated and isolated from insulation so that it can be cold throughout.
Snow diverters could be called roof snow splitters as well.
In addition to providing clues to your home s heat loss problems melting snow on your roof can also be the cause of another issue.
The purpose of snow diverters are to split snow and ice apart as it slides down the roof towards the pipes.
As long as the ice doesn t damage the flashing and roofing it should be o k.
Besides wasted heat melting snow on roofs can mean ice dams where snow melts in a warmer spot on the roof and then freezes when it hits the cold eaves.