Streaks on stucco

bonefish

Member
We cleaned a stucco home a few days and the entire house is streaked everywhere except on the covered patio. We used a mixture of 20 gallons of bleach (12.5%), 30 gallons of water and a quart of roof snot. I have attached a couple of pictures (or some reason they are sideways).It almost looks like the paint has washed off. The paint is old and in some places is pealing off. Does anyone have any idea what happened?
 

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I don't have the answer, but I am jumping in because I want to hear the answer also. Pretty interesting....

Only thing I would have to ask - because I don't have any experience with it - would that strength of SH be too "hot"? I am sure you DS'd it or use an x-jet....I just don't use 12.5% since I don't do any roof work. If my math is right, 40% of 12.5%SH DS'd with a 10:1 injector would put you somewhere around 4% 12.5 hitting the surface.
 
Sounds to me that it was a dedicated pump. You don't mix up 50 gallons of juice for DS one house. Roughly, you put 5% SH on that wall. There is a good possibility that you "washed out" the paint. Even higher possibility if you let it dwell too long.....
Could have been a mixture of too hot of a mix and cheapo paint. Could have just been the mix.



Halston Barney
Pristine Power Cleaning
www.GetPristine.com
Kerrville, Tx 78028
 
Probobly paint was oxidized and the streaks are that oxidation. And yes, mix was way yo strong.

Sent from my SM-G920P using Tapatalk
 
Yep sounds like oxidation. No streaks in covered area. I would say that mix was a little hot, since you could probably clean a roof with it! Mix should have been 3 gallons sh, 2 gallons water, 2.5 ozs roof snot. Through a downstream injector, or an xjet if you need a hotter mix. If you are soft washing you, might want to read up on mix ratios.
 
Your mix was way to strong. 20 gals. of SH to 30 gals. of water is a 60/40 roof mix. You don't need 12.5% for house washing. I use 8.25% downstreaming with a 4 gpm machine and it will eat the hell out of mold on just about any surface.

How bad did it burn the ground?

Whenever I bid on a home which has a painted surface or the old Aluminum siding(from the 70's or 80's) I do a small test area in as much of a hidden area as I can find. Let it dry and inspect the substrate.
 
Robbie, tell us how you applied your chemicals to the surface, what system you used, how long it took, etc.... That will help to explain the situation and help to come up with good solutions. It does sound like the paint got damaged by the bleach being too strong, that sounds like a roof wash mix.
 
Hard to tell on the PC screen and the light pictures,.(Picking my laptop up and turning and tilting one way and then the other, Ha,Ha),........but it sure looks like an oxidized surface with wand marks,...they go up and down and also sideways,..at least that's what I'm seeing. Very easy to do,..even with light pressure ,...doesn't take much to get into oxidation and make marks.

*I'd go back and remove the remaining oxidation.

Jeff
 
Hard to tell on the PC screen and the light pictures,.(Picking my laptop up and turning and tilting one way and then the other, Ha,Ha),........but it sure looks like an oxidized surface with wand marks,...they go up and down and also sideways,..at least that's what I'm seeing. Very easy to do,..even with light pressure ,...doesn't take much to get into oxidation and make marks.

*I'd go back and remove the remaining oxidation.

Jeff

Yes Jeff, you are right. If you look really close , you can see up and down marks. I am pretty sure I would have stopped on the first pass. But that stuff is hard to see when stuff is wet. But it also looks like some parts of the paint are melted off. That I would have seen!
 
I'm late to this party, but that home appears to be wrapped in EFIS/DryVit, not hard-coat stucco.
 
Your mix was too Hot 12.5 % ,Looks like it dried a bit,.Less Chems, more Water and do again i would .Can always ad more Chems to the mix as needed
Thats what i call chem burn .

Just my 2 cents worth for what its worth .

Good luck be happy.
 
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