[mhassett]

Tony, Maybe some Help here:
If you have a Low Sloped Roof (under 4/12 Pitch) Remove the shingles (first 3 feet or 6 feet depending on pitch) on the edge, and install: Ice Guard then Modified Rubber Roofing (Torched Applied-NO NAILS) Nails are the flaw of a Flat Roof, when the Ice Backs-up water gets in where the nails go thru the deck. The Modified Rolls are a meter wide X 30 feet long and also you can get colored granules to match your shingles.
Tony, do you have PROPER VENTALATION??? Soffit Vents with a Ridge Vent?? Must have both -- when the air enters the soffit vent and exits the ridge vent it Reduces Ice Back-Up. Also if you have a heat/furnace stack near the edge of the roof the Heat Loss is making the snow turn to water and then it Can Not get over the Ice on the Edge and therefore backs-up under the Shingles.
For the past 2 weeks we have been Chopping Ice and Removing snow. Most of the problems have been Poor Ventalation & Insulation.
Hope this helps and if you were Closer I would be Glad to stop over.
Any questions feel free to ask or e-mail me.
Mark