Best way to estimate mount of SH needed to do a large commercial job

cborne01

New member
Never had a job this scale and wanted to know the easiest way to estimate the amount of SH needed.
I'm bidding a job and working jointly with a painting company to first wash , then seal a 50,000 sq. brick building 100ft. high.

The building is not terribly dirty, but needs to be washed prior to sealing. Standard house mix will work fine for this one.
In doing small commercial and residential work , I typically don't have to use any formulas on estimates to calculate the amount of product that will needed, typically a few gallons, and any left over can go on the next job, but now I have to estimate how much SH I need to clean approx 15,000 sq ft. of brick.

Is there a formula used to calculate this that guys who do big commercial jobs use when preparing there bid? Its not quite like paint, where your told x product covers x area-- easy math there, or maybe it is that simple and I'm just overthinking things, but I need to be as accurate as possible on this bid, so any help appreciated.
Just want to make sure I'm doing this correctly.
 
Don't have a pic right now, its 50,000 sq. ft with approx 25% windows, so I estimated a bit high at 15,000 sq ft to clean, its actually closer to 12,500 sq. ft of brick that will need to be cleaned.
I will be DS'ing some of it and softwashing some areas of the job. We will be working from a window washing type scaffold rig and a 120' manlift for the high stuff. going look tommorrow to see if H2O access on the roof-- that would help alot on this one.
 
Yes Red, you are correct, I realized what I posted after the fact. My bad there.
 
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