[Alex Blair (RIP)]

Jif...
Did I just hear Pinkey comitting the No.1 "No-No"..Volunteering...??
Once you remove the snow ,which provides the insulation to trap the heat under the roof,the water won't form...so you will be safe from water leakage ,untill the snow builds up again...Don't worry about the ice dam....The ice dam dosent matter if there is no water to trap......Remove the snow and the leaking will stop...
A smack with the shovel or the back of an ax will shatter the ice dam along the edge of the roof...
If it rains before the ice dam melts naturally ,it will back up water under the shingles..
Obviously there is no leaks in the roof when it rains,so there is not a shingle problem,just a ventilation and insulation problem..