Sandblasting Brick.

 
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Old 08-27-2013, 09:00 PM   #1
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Sandblasting Brick.


Guy's needs some input asap.. I received a phone call from a property management co their looking to sandblast the exterior of a brick building that has paint on it can this be done without etching the brick? If so what are the tricks to the trade i'm open to all ideas.
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Old 08-28-2013, 12:16 AM   #2
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Re: Sandblasting Brick.


In my experience there are hard bricks that can have the paint removed by blasting and soft bricks that can not.
When the bricks are hard I use crushed glass at less than ten microns with pressure set to around 4 bar 60psi, Start lower and bring the pressure up until you get the results you are looking for.
Paint can also be chemically stripped and lightly blasted,

If bricks are soft walk away, see a recent thread I started a week or so ago.

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Old 08-28-2013, 05:08 AM   #3
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Re: Sandblasting Brick.


Good Info Right there!!!!



Thanks
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Old 08-28-2013, 06:35 AM   #4
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Re: Sandblasting Brick.


Removing paint from brick via mechanical means will almost always remove some of the brick as well. The outside layer of a fired brick is the hardest most durable part of the brick.

When the outside layer is removed, the softer inner portion of the brick is exposed and the brick becomes very susceptible to decay. Although blasting brick is often done, it is never recommended and usually the long term effects are destruction of the brick from weathering.

Educate your client on the various alternatives including chemical removal or replacing the brick with an approved brick.

I like to say that if your going to destroy a brick building by sandblasting it, you really should consider a more efficient alternative such as a wrecking ball.
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Old 08-31-2013, 08:02 PM   #5
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Re: Sandblasting Brick.


Quote:
Originally Posted by EcoStrip View Post
what are the tricks to the trade
Learn from the experience of doing the work in that trade.
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Old 09-02-2013, 09:06 AM   #6
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Re: Sandblasting Brick.


I don't think soda destroys the outer layer? Try a spot and see what they think.
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Old 09-02-2013, 02:33 PM   #7
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Re: Sandblasting Brick.


Any mechanical means of cleaning will remove some of the brick or else it will not remove anything including the paint.
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Old 09-02-2013, 05:26 PM   #8
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Re: Sandblasting Brick.


The 15 year old soda demo of stripping the paint from an empty pop can works because what's below the coating is al-lu-minimum. It's a non porous substrate, so no impregnation. 'Steels' are also not porous, but they're not disposable throwaways, so the need for an anchor profile so the coating adheres to the increased surface area and lateral tension.

Porous substrates are the eternal challenge for coatings removal...and that's not even including the mortar in brick/block apps. More than one air blaster has learned this and far more waterblasters may have, but most of them have fled jobs...or the dumber ones, kicked off. Come to think of it, so have chemical people.

Always amazed at how simple the trades can be, yet at the same time, in some cases, how much of a black hole disaster it can be in some cases.
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Old 09-02-2013, 05:30 PM   #9
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Re: Sandblasting Brick.


Quote:
Originally Posted by Betterblast View Post
I don't think soda destroys the outer layer?
Neither would glass beads. Or ceramic. Or plastic. Or corn cob. Or....sand....or slag....or....

Quote:
Try a spot and see what they think.
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Old 09-03-2013, 09:52 PM   #10
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Re: Sandblasting Brick.


Neither would glass beads. Or ceramic. Or plastic. Or corn cob. Or....sand....or slag....or....

Not sure I follow. Sand or slag or a ceramic media and I think even beads would most defiantly remove a lot of surface. Cob or shell are in line with soda and may do little enough damage to be acceptable. I may have missed your point on this one.
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Old 09-04-2013, 06:00 PM   #11
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Re: Sandblasting Brick.


BB, soda will etch brick....OK, mebbe not firebrick. It just gives more dwell time before it does. I've seen people blast newer vehicles with silica sand, not warp it, and strip it. So I guess my blabbering was referencing to the touch needed to blast something sometimes.

Waterblasters can become prey to the magic of the nozzle, relying on it to do it all while they just hold it and move it along. I've seen long digs into the brick with water because they thought sandblasting would rip it up too much and soda/recyclables were too expensive. Ironically, sandblasting with sand would have worked, but it would have had to have been a cleaned and properly sized alluvial sand...with the operator having touch.

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Old 09-04-2013, 06:38 PM   #12
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Re: Sandblasting Brick.


I agree w/CO762... I have had soda etch brick as a matter of fact.

I also own a 100 year old home with 2 separate paint jobs on the brick and am about to strip it. I would almost never do this for a customer but its my house. The paint is thin enough that the dwell will be short enough the paint will strip and have a minor profile I can live with. Most of the time painted brick is 10 to 15 different paint jobs with at least two coats on each...not really doable in that regard.
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Old 09-04-2013, 07:55 PM   #13
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Re: Sandblasting Brick.


I don't blame you for not doing a job like that for someone else.A big sales pitch for the paint strippers, other than their containment, is their ability to remove coatings from soft materials....like old brick with horsehair mortar. The best remedy for multi layers of pain on brick like on your house was to blast it with a med/fine angular slag, being OK with it digging in, then sealing it and calling it 'urban'.

Come to think of it, why not just cover the whole fricking thing in vinyl?
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Old 09-06-2013, 06:52 PM   #14
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Re: Sandblasting Brick.


Quote:
Originally Posted by blastserv View Post
I have had soda etch brick as a matter of fact.
I remember when soda first came out...the reps were stating you could blast whole vehicles with it, even windshields/windows and not have it frost/etch. The empty pop can came later and true to form, that did not frost.

OK, so that proved not to be true, so they narrowed their niche. But that wan't working out too well, so they then added no 'soda' to it.
So why not just use trona? That came out, along with ag 'soda'.

OK, so now the reason to use their soda was the flow agents in it.
But if you have a generic low flow pot, why the need for flow agents?
And if there was a need for them, why weren't they put in them in the first place?

This stuff isn't complicated.... as long as you're just using your shop compressor to clean up welds...
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Old 09-07-2013, 08:34 PM   #15
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Re: Sandblasting Brick.


So here is a job that we went to do the other day, went in blind cause the customer didn't do anything that I needed -
Pictures, Measurement was off And how he described the job was the paint was flaking off.
Well the paint was on good, it was the block falling.
When we did a test patch ( dry, wet, different size grit and psi ) threw every trick at it. Lol
The test came out to 30 -40 sqft per hour !
I have never had anything under 70 sqft for stripping brick / block before. Wow

Re-did our estimate for the customer.

Headed home early that day!! Lol

You have to learn when to walk away.
Not working just to pay fuel and helper.
Ya I feel bad for the customer but....., I'm not a charity business.

It was a toss up between metal siding or stripping and re coat on block.
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Sandblasting Brick.-image-3800396681.jpg   Sandblasting Brick.-image-2052711206.jpg  

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