You could ask around on the garage journal forum. Those guys are shop floor freaks. Some are to nice to do any real work on them though. 
Anyone ever use a concrete grinder before?
Since my assbag of a concrete guy just did a nightmare of a job, I get to have a shit surface floor instead of a slick finish.
So who has used a grinder before? Is it easy to take a rough trowled/bullfloat surface and smooth it pretty good? I just want a smooth semi-slick finish.
I have to epoxy my floor now I think in order to prevent anything from soaking into it.
You have no idea how frustated I am right now. :mad3:
So who has used a grinder before? Is it easy to take a rough trowled/bullfloat surface and smooth it pretty good? I just want a smooth semi-slick finish.
I have to epoxy my floor now I think in order to prevent anything from soaking into it.
You have no idea how frustated I am right now. :mad3:
21 - 32 of 32 Posts
I use them to knock down the imperfections when we lay down linoleum tiles on cheapy basement jobs. I don't know the mfg of the machine we rent but it has two counter rotating 12" discs that hold 2 by 2 by 3 grinding stones. I use the lowest grit they have (20?) but I am covering them over with tiles. It scraches the floor pretty good. Think 60 grit marks on bondo. The first go around with the machine I used 80 and It took forever. It was a while ago but I remember it being nice and smooth. The machine has a attachment for a hose if you can use it! The process happens twice as fast and no dust. You just have wet feet.
Why wouldn't you grind green concrete if you plan on covering it with epoxy? It should grind easier. Enlighten me.
Steve
Why wouldn't you grind green concrete if you plan on covering it with epoxy? It should grind easier. Enlighten me.
Steve
Like Mr stubs, I'm in the business to. I own a concrete finishing business and we do this all the time. Rent the machine with the stones, have a kid sit on it or a couple bags of quick-rete, water or vacuum to keep the dust down. You may need to but a second set of stones, but have patience, you'll get there. This is not a quick process. I myself use Ucoat-it for the epoxy coating. I haven't needed to use a selaer first or anything. It's water based and sinks into and bonds with the concrete. Does'nt sit on top. Then gets a Urethane top coat.
This is a commmon problem in the place finish concrete world. 2 jack legs in a broke dick pick up with a crooked 2x4 becoming a concrete crew. It keeps us busy at work. We are in the repair and resurfacing business here in the carolinas.
The earlier you grind the easier it will be, the concrete slab will continually develop strength and the stronger the matrix the more effort to grind, and the more wear on your tooling.
be safe, the concrete dust contains silica, causes cancer in large inhaled quantities.
The rotary grinders with carbonundrum stones will knock down the surface fine for your coating, The edges willbe a bit of a challenge, mostmachines only get within an inch or so of teh walls and inside corners can be 6". Weve used die grinders with coarse stones when polishing/ grinding around detail stuff.
Also, if you're going to do your own coating, check to see if you have a vapor barrier under your slab, most coatings dont breathe. duct tape a 2' square sheet of visqueen to your floor for a day or two, if you have condensation underneath you will likely have issues bonding and blistering.
The earlier you grind the easier it will be, the concrete slab will continually develop strength and the stronger the matrix the more effort to grind, and the more wear on your tooling.
be safe, the concrete dust contains silica, causes cancer in large inhaled quantities.
The rotary grinders with carbonundrum stones will knock down the surface fine for your coating, The edges willbe a bit of a challenge, mostmachines only get within an inch or so of teh walls and inside corners can be 6". Weve used die grinders with coarse stones when polishing/ grinding around detail stuff.
Also, if you're going to do your own coating, check to see if you have a vapor barrier under your slab, most coatings dont breathe. duct tape a 2' square sheet of visqueen to your floor for a day or two, if you have condensation underneath you will likely have issues bonding and blistering.
Peanut shells make the best concrete finish I've ever seen.
Thanks for the info guys. I appreciate it.
I have to use a pretty solid grit since it's pretty rough in some spots, and smooth in others. I planned on grinding it down, and then putting on U-coat it when it's been 30 days. I've got a vapor barrier, and I'm not putting anything in the shop until I get the floor finished to make sure I don't stain or spill oil on it.
I have to use a pretty solid grit since it's pretty rough in some spots, and smooth in others. I planned on grinding it down, and then putting on U-coat it when it's been 30 days. I've got a vapor barrier, and I'm not putting anything in the shop until I get the floor finished to make sure I don't stain or spill oil on it.
Sounds like the right approach, good luck. Did you get the urethane topa oat from UCoat it? I've heard their epoxies can yellow with UV exposure.Thanks for the info guys. I appreciate it.
I have to use a pretty solid grit since it's pretty rough in some spots, and smooth in others. I planned on grinding it down, and then putting on U-coat it when it's been 30 days. I've got a vapor barrier, and I'm not putting anything in the shop until I get the floor finished to make sure I don't stain or spill oil on it.
I forgot to post back..Did you grind it yet?My concrete buddy said just wait 7 to 10 days then grind away.He said if it was still to green then it might chip.
Was planning on grinding this weekend which will be at 10 days, but it might not happen this weekend.
No U-coat it yet, but I'm getting the standard floor coating. Haven't heard anything about Yellowing. But anything will look better than the white marbelized mess I have now. :laughing:
No U-coat it yet, but I'm getting the standard floor coating. Haven't heard anything about Yellowing. But anything will look better than the white marbelized mess I have now. :laughing:
How did this turn out?
I am in the same boat as you. I am thinking this is my solution.
I am in the same boat as you. I am thinking this is my solution.
So been doing larger jobs lately over slabs. Many of the slabs around here are very old and have low and high spots that are unreal being that the homes are so freaking old over here. I would like to get into grinding but I do not know much or anything about it. Or should there be another approach? Can a machine be purchased that will grind the whole floor and take off the high spots as well?? Does anyone who cares to enlighten me I am all ears. I know EDCO makes some very good machines for this purpose I have been looking at them but I am unsure of which one I would need. I even emailed their technical support but they did not answer me.Since my assbag of a concrete guy just did a nightmare of a job, I get to have a shit surface floor instead of a slick finish.
So who has used a grinder before? Is it easy to take a rough trowled/bullfloat surface and smooth it pretty good? I just want a smooth semi-slick finish.
I have to epoxy my floor now I think in order to prevent anything from soaking into it.
You have no idea how frustated I am right now with airless sprayers Los Angeles. :mad3:
I need to grind down some concrete high spots to get a better level before I tile, mainly a sand and cement mix without any pebbles. What is the best attachment to use with my 115mm angle grinder? My research here leads me to a silicone carbide product concrete grinding st louis, would this be of any use --here as I already have the backing pad? I also have a bosch Pex 125 sander with a velcro pad I can use, or do I go for a diamond disc/pad.Since my assbag of a concrete guy just did a nightmare of a job, I get to have a shit surface floor instead of a slick finish.
So who has used a grinder before? Is it easy to take a rough trowled/bullfloat surface and smooth it pretty good? I just want a smooth semi-slick finish.
I have to epoxy my floor now I think in order to prevent anything from soaking into it.
You have no idea how frustated I am right now. :mad3:
concrete grinding san antonio
21 - 32 of 32 Posts
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