Rust-how-to-roof-stack, *super effective* rust heli base design very cheap! - rust base building (10,200 stone) - duration: 8:12. boom dude 67,984 views. Red or rust stains on roof surfaces or shingles: what causes red stains on roofs, how do we remove red stains from roof shingles & how do we prevent red stains on roof surfaes. red staining on roofs is often due to rusting metal components but might be an algae or other contaminant., i was up on my roof today and noticed rust on the furnace vent. the vent is a typical 4″ galvinized pipe with a cap to keep the weather out.