This was in Romeoville, Il. 150' high. We SeeSnaked and K-500'd this one. The plant guys would come up to the roof and smoke cigarettes and drink pops. They got rid of the evidence down the roof drain. It filled up and froze this winter. I got a roofer and cut the 5" galvanized beneath, popped out the drain, put in a new one and then cleared it.