So I’ve started this job on a building that has carbon all over it. The areas that I can access and hit with pressure the carbon melts away and is a non issue. The issue is with the higher levels of the building that have the carbon buildup. I went by today to test out some downstreaming my SH to the top to see what the outcome would be. It did lighten it up. So this lets me know if I use a roof mix it should melt away the carbon. Problem being I do not have a roof wash setup, my local shop is pushing the Air setup they have, it looks nice and I really am interested in it. 2 jobs will probably pay for it.
The advice i am looking for is this - would i be better off just applying pressure to the heavily soiled areas? Or going ahead and springing for the roof system and just knock it out, the heavily soiled areas are located above an awning, see picture.
Thank you for any help! The second picture is right after the DS application. The carbon is also heavy under the windows
It’s a 2 story building. The awnings are technically walkable but it requires laddering up and going over a small fence to get onto the awning. After downstreaming 12.5 today it lightened up the carbon, but I’m pretty sure this job would require a roof mix at this point.
Would I be more beneficial to ladder up up and spray, or set up for the roof wash.
This job is 2 buildings approx 20k sq ft, the question is will treating the siding with roof mix kill the black marks, or should I just hit the whole complex with pressure. I don’t want to try and deal with this job with a roof mix just for it not to work and make the building clean.
(Edit)**the awnings stick out enough to be walked on
If it’s actual “carbon” sh won’t work. SH kills organics such as algae, mildew, etc. Carbon will require a degreaser. You’re likely dealing with mildew. The brick definitely has organic growth on it.
Ok I’m sorry It’s probably not “carbon” but whatever it is is organic. The two pictures posted are before and after. I downstreamed 12.5, so what’s hitting it is probably 1.5 or so. It’s making progress but will never get the building clean.
I saw please don’t walk on those awnings, and thank you for the advice.
The question - will hitting these spots with a roof mix knock it out?
On the ground level I can get the walls clean with pressure, it’s just the second story in the picture that is an issue.
You’re going to need a pretty hot roof mix, probably a couple of coats. If you don’t have a 12V, you may could ladder up and shoot it with a pump up of almost straight SH. Don’t rinse between coats.
So I’ve read about people cleaning roofs using 12.5 SH with an X-jet and a smaller machine. I happen to have a backup 3gpm that I started with. What I have read is people use a 2.5GPM x-jet and that mix get hot enough to do roofs.
How hot does that mix get? Anyone know?
Would that be worth a shot? If all I have to get is an X-jet to knock this one out that would be great.
