Using a snow blower on your roof is probably not the best thing to do, given the danger of slipping and also potentially damaging your shingles on your roof. However we know people are going to disregard these suggestions and do things that may compromise their own safety. You are much better to use a snow rake, stand on the ground and pull the snow off the roof rather than lift a snow blower onto the roof. Although a snow rake takes more work, it is by far the safest approach to take. If you are going to use a snow blower on the roof, use one that is meant to be portable, that you can lift with one hand and that you can handle easily while maintaining your balance on a slippery roof.
Best Snow Blowers for Roofs – Portable Snow Blower
Most snow blowers are far to heavy to lift onto the roof and they will definitely damage your roof as well. Use a portable snow blower like the one in the picture. It is an electric blower so no need to worry about spilling gasoline on your roof and it is light enough that it will do less damage to your roof.
The hand held model will handle most snow conditions, however if there is ice or hard packed snow it may have more difficulty removing the icy junks. You probably also blow the snow onto adjacent sidewalks or even your driveway and will have to clear it later on. This is to be expected. If there are shrubs just below your roof, try to avoid dumping too much snow onto the shrubs. The weight of the snow will usually break the branches and flatten them to the ground.
If there is any doubt about your safety, hire someone to do the work on your behalf or use a snow rake to remove the snow.