Stripping Paint From A Handball Court & Concrete

plazaman

Ive been asked to stripped appox 880 sq.ft of a handball court wall in a city park front, back, and 2 sides. I have to take it down to bare concrete which shouldnt be a problem. The wall is going to be resurfaced. A 4000 psi pressure washer was used to strip the wall, went fine, but a very slow process, thus, i was called. I was thinking about using crushed glass grit for this project. What do you think?


I also have to strip 1200 sq.ft of painted concrete, paint is badly peeling already, shouldnt be to hard. Crused glass girt i was thinking for this also.


I dont want to pit or cause holes in the walls/concrete, i need an even removal.


Also, what would you guys charge for this job? I think i want to bid around $5 per sq.ft

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BulldogMedia

plazaman I would go do a test blast of a few sq. ft. You can time how long it takes to do and see what the result of the blasting. Then you will have what you need to figure out what you need to charge. I would use crushed glass to do this job.

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plazaman

i would like to do a test area, but its kinda a hassle to bring the equipment out. My estimates includes up to 4 days of blasting approx 2080 sq.ft. I think i left myself with enough room there. How much sq.ft do you think i can a blast an hour with a number 5 or 6 nozzle 125 psi?

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BulldogMedia

It is a hassle to take the equipment out but I am finding it is the only way to get a good idea of what it is going to take and if the result is what is wanted.
The last one I did was about 4 sq. ft. per 5 minutes with number 5 nozzle and 40-70 grit crushed glass

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plazaman

how many layers were you removing? Steel or concrete?

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BulldogMedia

One layer on concrete

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plazaman

was it some sort of epoxy?

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plazaman

i could remember on my slag job that i getting more that 1 sqft per min, i would say almost 1.5

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BulldogMedia

I was told it was epoxy

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MEDIA MAN

Plazaman, do the test area! You may want to do 2 areas. Some places may be harder to get off than others. Not only do you see the result but the customer can also.

tom connelly

have you thought of using a chemical, instead of using a blasting method. You will have less damage to the surface.
Stripper Cream or
instrip

from EaCo Chem would probably get the job done, very fast too. without etching the concrete. If you use Stripper Cream you will need to neutralize it. It is very high caustic. make sure you wear protection. It can be mean. The instrip is neutral tho, so no acid bath is needed. it is also environmentally friendly, which might make the park maintenance happy.

plazaman

bulldog & Steve, what would you charge for something like this? Assuming we are getting about 1+ sq.ft a min

they are providing me some labor also, since its supposed to be a prevailing wage job.

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BulldogMedia

$7500

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plazaman

for all of the 2080 sq.ft or just the handball wall? My bid was prepared at$10,700 remember, this is a prevailing wage job. Everything was bid at higher prices.


They dont want the use of any chemicals. Plus, i wouldnt have a job there if they used chemical stripping!

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MEDIA MAN

If it was me, what I usuall do is figure my time, materials and what I need for a profit. How high is the wall? Will you need to rent a lift? How many guys will you have on the project if they supply help also. Blasting from ladders works but its a pain and dangerous. I also know what my business needs per hour with my wages, overhead and profit.

If I did my calculations right you figure then the actual blasting on the wall will take approx. 10-15 hrs (1-1.5sqft/min @880 sgft) and the 1200sqft @ 13-20 hrs. Best and worst case scenereo.

Here's where doing a test is beneficial!!
I like to give a range. Your price and my price will vary because your territory and your business is different than mine. I own the business (as you do too) but do not have employee's to pay. As an example something like this say best case scenereo $3500 and worst case $4600. This is based on 1 man and $132/hr. overhead and profits included, media and clean up/disposal not included. Media is around another $2500-$3700. I burn about 2.5 gal fuel/hr. thats about $200 - $350. Best being the paint comes off easily-$6200. Worst, being difficult -$8650. This way I am not commited to 1 final price. Nothing fustrates me worse than getting into a job and know you are at a point that you are loosing $$$.

I have not removed paint from concrete surfaces, a lot of gum removal though. Gum removal goes fast so not much media is used.
How much media do you use in an hour. According to Clemco a #5 nozzle at 125psi you will consume 982#'s of media. I don't think you will use that much. I average about 450-600#'s on heavy/hard blasting. A fine media probrably will go farther. You won't want a real agressive grit for sake of eating into the substrate.

Have you ever calculated your hourly rate? If you are interested go to www.woodweb.com/knowledge_base/Figuring_labor_and_overhead.html
(there are underscores where it looks like spaces)This is very informative.

plazaman

Steve, thanks for the info above. The wall is 16' high. I was thinking about doing a rolling scaffold tower 3 sections high, and enclosing it in a mesh tarp. Seems wise or should i be looking into a lift? Your numbers are probably on point, mine being a bit higher. I want to use a fine media, something that will cut fast and not profile/pit the wall much. The wall is bit easier to do since you can have the lift/scaffold in 1 place and work the entire section.

The fence on the other hand is located on the sidewalk. I am blasting the concrete below the fence. Basically, they ripped the park up and we are about 2ft below the streets side walk. I have to blast approx an 18" strip totaling about 1200 sq.ft . The problem is the rebound abrasives going onto the sidewalk. My proposal states that they have to hang tarps along the fences. Do you think this is sufficient?


By the way, thanks for the filter partnumbers. I cross check with baldwin and ordered. I have a good source who offers free shipping with orders over $75

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BulldogMedia

Well looks like my number was right in the middle and it was for the whole job

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PLAZAMAN

The numbers I gave are the actual costs. I did not factor in for waste, clean up, set up or anything else. You will have set up costs. It will cost time and money to set up and enclose the scaffold and such. So you may not actually be high.
Good Luck with it. Hope you get it. How soon will it be?

I have really good luck with the 60-100 and the 40-70 glass. I stripped a 16' aluminum crestliner boat yesturday with the 60-100. I am going to replace the soda with the glass. About the only thing I will really use soda on anymore is the fire restorations only because of it being a natural deoderizer, and some autos.

MEDIA MAN

Bulldog,
Your numbers probrably aren't far off. Things in your territory are different and your business operation is different. Overhead and profits and such.

Not to change the subject - but you do powder coating. Have you ever heard of the Xiom 5000 portable system. If so can you tell me anything about it. I have sent away for info. on it.

plazaman

I submitted a bid for $10,700, just faxed . No clean up for me, my proposal states that they will take care of all of clean up with their labor.

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