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Old 11-15-2013, 10:10 PM   #16
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Blasting to remove paint from cinder blocks in a basement


itsreallyconc, Well I just bought item 121212508321 on ebay (one of three available). If this thing works I'll be floored and will be only wishing that I had known about this a year ago. I've spent so much time, effort and money trying to solve what seems like an impossible problem. I'll let you know how it goes.


Last edited by JoeT; 11-15-2013 at 10:13 PM.
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Old 12-22-2013, 10:31 AM   #17
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Blasting to remove paint from cinder blocks in a basement


How long should the cutter blades last? I only did about 40 blocks and here is what the cutter blades look like now. These are were new cutter blades that came with the scarifier. It feels like the effectiveness of being able to remove the material is doing downhill fast at this point. Sometimes I'm getting sparks off the surface of the block. I guess that is because of the steel slag embedded in the cinder blocks. Some blocks seem to get cut pretty easy while others are barley getting scratched. I don't think I'm putting much pressure on the cutters and am trying to just let them do the work. But not much happens unless I start adding pressure.

It would be an understatement to say this makes a mess. I took some measures to have all the dust contained but it's not enough. The entire work area is enclosed in plastic sheeting (ceiling too) and there is 1100 CFM fan exhausting the dusty air out the window.

I guess I better buy the vacuum attachment for this thing. I'm seeing the cutter blades go for about $70 a set. At this rate I'll be spending some serious money to do all the blocks. But I don't see any other choice.
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Old 12-23-2013, 03:25 AM   #18
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Blasting to remove paint from cinder blocks in a basement


40 x 16 x 8 / 12 = 35sf,,, think you should be getting more, too,,, try using carbide cutters - steel's not working well enough imo

you're right - let the tool do the work,,, chipping gun & 12pt/16pt bushing tool's another possibility but i still favor frp panels

Last edited by stadry; 12-23-2013 at 03:28 AM.
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Old 12-23-2013, 06:49 AM   #19
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Blasting to remove paint from cinder blocks in a basement


I'm still puzzled as to what the end game is going to be.

It's likely there's still going to be the external moisture issues, as nothing's been posted here regarding efforts to abate them. All this effort to peel off the inside mess while doing nothing to prevent it from coming right back again. When you see signs of problems like this there's really no better effective long-term way to solve it other than exterior remediation. Otherwise the problem WILL come back again. Now, maybe it might not come back within a given timeframe, like during the time it takes to flip a place but that doesn't sound like what you're doing.

Think about it this way, ever gone down a basement and commented, gee what a nice looking block wall? So why bother making it look nice? Get it roughly cleaned and properly cover it back up again. As in, a stud wall, insulation proper for your area and a wall covering (frp, drywall, etc). While meanwhile solving the exterior water problems once and for all.
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Old 12-23-2013, 08:16 AM   #20
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Blasting to remove paint from cinder blocks in a basement


Hopefully will find that cutter blades I'm using are cheap ones and not carbide steel. And then find getting carbide ones will fix the wear problem.

Seems weird to quote myself:

Quote:
Originally Posted by JoeT View Post
No offense to anyone out there but for the benefit of everyone who keeps wondering why I'm doing this: I'm exploring all options at this point because the obviously 'right way' as I mentioned earlier is insanely expensive. If the wall looks ugly and beat up after I'm done, but I can seal it and then cover it up as a finished wall then who cares? As long as the structural integrity of the blocks are not affected then I don't care. If the end result is not as good as doing things the right way but is 20 times less expensive and is 'good enough' then why should I care? I don't really have water problem but a humidity problem. Why can't I at least partially address it by taking steps to block the transmission of the water vapor through what is normally vapor permeable concrete cinder blocks?
No point to putting up walls until I have some assurance that water vapor coming through the porous blocks to the interior can be reduced. I have a humidity problem not a water problem. Easy to say spend the $10 - $15K for the drastic fix when it's not your $$.
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Old 12-23-2013, 07:06 PM   #21
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Blasting to remove paint from cinder blocks in a basement


Yet it's a pretty much pointless endeavor unless you deal with the water. This isn't about cavalierly spending someone else's money, it's about not ignoring that much larger issue.

What do you think humidity is? It's water. Where is that moisture coming from? Efflorescence typically means it's coming in through the porous material... from the outside. So why not come to grips with that first before making an unholy mess of things on the inside? Now, I suppose there's a window of time where working outside isn't terribly convenient (winter). But then there's all the water from snow melt to consider. At least with a scrubbed wall it might be easier to see the first signs of problems. Well, whatever. good luck when the real work starts.

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