Failed seals around your chimney or roof vents.
Snow melt on roof around chimney.
Heat transfer during winter use is most likely causing the snow melt and ice.
Just inspect it carefully once in a while and at least annually for any necessary repairs.
As long as the ice doesn t damage the flashing and roofing it should be o k.
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.
The purpose of snow diverters are to split snow and ice apart as it slides down the roof towards the pipes.
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.
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.
Snow diverters could be called roof snow splitters as well.