Hey Everyone,
Im doing a hotel, and Ive done dryvit before where run off caused some discoloration in the paint, but this looks like growth that won’t come clean. Ive hit it 3 times with a plenty strong mix of sh and EBC. Other parts of the hotel in different paint colors come out pretty good, just not this area. Any thoughts? Tried oxalic just as a text, no change.
Was it present on any of those upper bands? That “brick” facade appears to be painted, and the color is similar. Maybe the paint has been breaking down and onto the EIFs?
I’m assuming the obvious “rusty flashing” above it has been ruled out. Did oxalic make it any better? If so, F9 may be the next step. @Racer would be the man to say the best process for using it on that surface.
Ox didn’t touch it, and acids make me nervous since there are metal window frames below. Part of what has me stumped is the strips above look great.
Edit-if it was directly below the windows I would look to the flashing, or directly below the windows I would think a/c units, but this is consistent no matter what is above it. It was black before and looked like mold/growth. Thankfully I didn’t promise them the world.
That band sticks out more than the others. Can you get your ladder high enough to see what is above it. On another note I had one similar on on a small medical complex that had similar colored brick and then had a decorative strip like that. Took hitting it 5 or 6 times with a 50-50 mix, about 10min dwell on each, no rinse in between, before it finally came clean.
But when you get up there and if there is any metal it may be leaching from, spray some F9 on it, like straight on a spot and let sit for a few min and then rinse. Don’t worry about windows. You just need a small sprayer.
@Racer thanks Rick, I tried that today but same result. Have you ever used one restore on dryvit?
Edit-Im thinking Im going to try a bit of one restore and f9 barc tomorrow just to see what happens in an out of the way spot.
No, but give it a try. Don’t think it’ll hurt it. I’ve got same problem with a small area on a commercial building where it has run out from behind a metal canopy. It’s not rust and looks like yours and I tried brushing it the other day after hitting it with straight SH and still not good. In fact told property manager today, if they want gone, they’re going to have to paint it.
Need to be careful with trying to paint dryvit. Material is not actually painted, at least not when it’s installed. It is colored as an integral mix before it is applied to the wall. It is paintable, however it will suck up a ton of paint and you will never get a good match because the of the sheen. I do facia restorations for my sign business and one time the national sign company I was doing a Verizon for insisted that I paint the Dryvit facia. I used 5 gallons to get a barely non-splotchy finish on 300 square feet. Spraying it may have a different result but it still won’t match properly.
Also, the system is generally designed to shed water within the system, so it requires certain types of paint, etc. It depends on the system design how it works, which would likely determine what it needs. It’s a very specialized installation, it just looks like traditional stucco, lol.
Thanks guys for all the good info! I’ll pass it on to the property manager.
To update what happened, exactly nothing. I tried one restore only slightly diluted, napa aluminum brightner, and 5x coats of 6% sh. Paint it is!
