First let me reaffirm that SDE's GF's roof is conventional.I believe that you are asking about what is called ice and water shield up here in the north. It has been very popular for probably 30 years. When snow melts on a roof the water runs down under the snow, and drips off at the eaves when the temp is above freezing. When the temp is lower, yet inadequate attic insulation/venting causes the snow to keep melting, when the water gets to the overhang, where there is no warmth underneath, it freezes. This continues and an "Ice dam " is formed. Water backs up behind it until it finally goes up over the top of the shingles. The Ice and water shield provides a sealing membrane which prevents the water from getting through. In the south it would be very unlikely for ice dams to form, so I would not see it happening. The solution to SDE's situation is to form a positive drip edge a little way away from the side of he house.
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