I had to use a lift on this roof. Being 130+ years old and the interior was refurbished about 10 years ago, I didnt want to risk spraying and rinsing up the roof, never want to do that anyways. Plus it made it so much easier and faster. Cleaned whole roof including steeple, garage and north side of the rectory in less than 3 days. The hardest part was putting down 2x10s for the lift wheels so we didnt ruin the grass. The lift oes pretty good around tight corners but there does nee to be some space for the lift to swing around the corner.
Yes, Slate cleans up really nice. I used about 30 gallons of mix @40% on this side of the roof (north side) and used no surfactant. I probably could have used less mix if I added surfactant but the slate here is over 130 years old. IMG_2856.CR2 IMG_2895.CR2 IMG_2903.CR2 And Chris, the patina'd copper ridge cap wasn't affected, still green. Client is Super Super happy, Said it was a miracle.
I havent tried oxalic acid, I should. It took 3 coats with f9 at 1:1 but as I said it was real heavy deposits of mostly creosote which has built up for about 15 years. F9 isnt really too expensive compared to other chemicals. The expensive part for me is the shipping costs. Never using oxalic Im not sure what the costs are or how it compares to f9. Yes Ted I will suggest to my client to paint the metal stack. Its galvanized steel, could be aluminum its polished and only about 24" tall. Single story ranch. So my main concern now is the discolored aluminum. I could clean with an aluminum polish and use a metal etching chemical to help make it look closer to the rest of the oxidized snow shield or just clean it up and tell them it will oxidize over time.
Need some help here. I was cleaning rust and creosote off from asphalt shingles on sunday using Barc f9 at 1:1 . Very heavy deposits. My problem is, the f9 left the aluminum snow shield with dark streaks. The aluminum was oxidized but now just looks like crap. I asked Craig from f9 and he suggested Mothers aluminum polish with a soft polish ball. Im sure it would work but I dont want a shiny polished look. My client didnt really seem too concerned with it but I just wont leave it like that. Im looking for a spray on rinse off cleaner. Looked at Bar Keepers Friend. Any advice would be appreciated.
Ok. I do want the 1"poly pump. I'll have about 17cfm, hope thats enough. My Yamada is clicking loudly and there may be gunk in the pump. I took off my muffler and there is a combination of water gunk with oil from the compressor inside the muffler.