I`ll have to get a picture of my roof for you guys.. it's 2 story, with no "1st story" roof. The roof starts at the first story but goes UP UP UP... you can only walk on the upper most /\ portion, and the ice builds on the even steeper lower section.

This is the first time I've seen this problem... but as mentioned with the water sitting and draining different due to ice I am concerned about my new roof. I am thinking I can use 20' or so to do each dormer and then a 100' to do my front shady area.

Compared to other parts of the country it doesn't get TOO cold here, but due to trees and shade it can stay a long while if we don't get rain, even if it does warm up to the high 30s, 40s during the day.

For the cost these seem pretty nice, but I don't want to burn down my house either, or electrocute anything. I think they need a GFCI outlet.