We just had an ice and snow storm and everything is finally melting. I just noticed this on my ceiling. I have a roofer coming Monday but I didn't know if someone could tell if this looks like roof leak, problem with the attic or mold. 
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Melanie Weeke
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Most likely you have some ice dams on your roof where there is melting underneath ice buildup, causing water to seep underneath shingles. The ice prevents water from running off the roof, and the only place it can go is under shingles and back upwards underneath shingles and waterproofing membranes. Main cause is poor attic/roof insulation that allows the roof to get too warm and melt underneath the ice.
Milwrdfan
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