I have been banging nails for a little over 20 years and have run into a strange problem recently on my last few roof jobs that i was wondering if someone else has seen the same thing. Wether the fascia bd. is pre-primed pine or composite trim or cedar i am getting black stains. Each job i do the same thing 8″ aluminum drp edge, then Ice and Water shield then starter strip followed by shingles and i am wondering if the coil nails are reacting to the alm. drip edge causing these black marks this happens on heated and unheated roof areas the last 2 on new additions i built with soffitt and ridge vents HELKP!!!!
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