Ice dam can be prevented with the regular cleaning of the roof but you must ensure the quality of roof coating applied on the roof. Only this way the damage will be minimum otherwise the damage will be maximum and you have to spend more money to recover the damages. For more information
insulation of the living space and proper ventilation of the roof
I agree. I've mentioned the concept to Mom, and see if she allows that.
Tell her if she doesn't. the dam water will freeze along the dam eves and you'll have a bunch of dam ice and when the dam ice melts, the dam water will ruin her dam ceilings and that would be a dam mess her son would have to fix.
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