Stand on the ground a few feet away from the roof overhang. Place the blade of the snow rake three feet up from the edge of the roof, parallel to the gutters. Pull the snow down.
Rake off the top layers of snow until two or three inches of snow remain on the shingles. Removing any more will ruin the shingles and cause an ice dam (see Step 5).
Position the snow rake next to the space you just cleared. Repeat Steps 1 through 3 until the lowest section of the roof is cleared.
Move the rake higher on the roof once the lowest three feet are cleared. Repeat Steps 1 through 3, taking care to remove all of the snow from the previously cleared row. Repeat until the entire roof is cleared.
Treat ice dams that you encounter with snow-melting chemicals. Place the chemicals in the foot of the pantyhose after cutting them about six inches or more from the toe. Toss the nylon bag onto the roof, but behind the ice dam. Allow it to work the ice away.