Concrete floor grinding?

[Sasquatch912]

Found a dual disc diamond grinder at Sunbelt Rentals. Its going to cost $399.27 with dust extractor or $247.76 without dust extractor. It comes with all the disc prep.

I got to do my 30x30 area.

Should I get it with the dust extractor or not?

Got to call him in AM

 

[JStar4]

Yes get it!

 

[Sasquatch912]

with the dust?

 

[readhead]

Yesss. If it is a wet grinder then no.

 

[Sasquatch912]

Ok..already called him to get the dust extractor...figured it was the logical thing to do..
Thanks guys! Ready to get this shyt done!!!

 

[LegacyIndustrial]

Good job!

 

[Sasquatch912]

Grinded some today. Way smoother than what was there originally.

Still have a few tiny bumps..tried grinding out but still there.

Still have my low spots.

Going to vacuum it all tomorrow and see how it looks.

Should I rinse the concrete with water? Or will vacuum be good enough?

 

[LegacyIndustrial]

Vac and broom 3x. Water and coatings don't mix well.

 

[JStar4]

Mop it with denatured alcohol

 

[Sasquatch912]

Ok. No water then. Maybe it wont rain and leak in like it has. Broomed again today. Heres what it looks like. Im gonna sweep some more soon.

Thanks guys

 

[LegacyIndustrial]

Blower works great. Put nozzle right on the floor.


Sent from my iPhone using Tapatalk

 

[Kewadiak]

hello just curious of why you grinded your floor and how well it turned out. I just got my floor poured in may and the concrete contractor left allot of trowel marks and rough spots. I am thinking of trying to grind my floor if its even worth it.

 

[climb.on]

I'd like to hear more info on the details of your floor, what grits you used, and what the issues were before you started.

 

[LegacyIndustrial]

I'd like to hear more info on the details of your floor, what grits you used, and what the issues were before you started.

I will speak to grits. Use 25-30 grit for epoxy floor prep.

 

[wyliecyoti]

30x40x14 garage with three 10x10 doors. The concrete installer did a really good job with smoothing, but a smooth coat would never hold a coating. I rented a buffer and grinding disc from Home D. and commenced to using my Honda generators and and the buffer to rough it up. All in all, it turned out really well. Tools used: Generator, stiff push broom, soft push broom, angled broom, yard blower, exhaust fan. Lessons learned - DUST DUST DUST ... lots of dust .. so much my neighbor pulled up because he thought the garage was on fire. Wear protective equipment and be prepared to clean up the dust for months on end. It got everywhere, on the rafters, in the garage door tracks, on the outside of the door (they were open) that when I shut them, there was a huge pile of dust that needed to be blown away and the doors wiped down. All in all - lots of clean and prep work, but damn the floor looks freaking awesome!!!

 

[jabin]

Be very careful of the concrete silica, it's bad, recommend more than just a n95 dust mask.

 

[hondaguy1482]

How much did the buffer and grinding disk run you Wylie?

 

[keerthi]

this guide would be helpful : Top 10 Floor Buffer Reviews 2017 – Buyer’s Guide
https://buyvaluablestuff.com/top-10-floor-buffer-reviews-in-2016/

 

[Armorpoxy]

OSHA has issued new silica hazard rules that require the use of dust respirators for these types of applications.

 

[Sasquatch912]

hello just curious of why you grinded your floor and how well it turned out. I just got my floor poured in may and the concrete contractor left allot of trowel marks and rough spots. I am thinking of trying to grind my floor if its even worth it.

I grinded it because..truthfully...we did not such a great job. I shouldve really did the concrete in sections with the stress relier cracks put in. We poured the whole 30x30 area in and some spots were low.

Buddy of mine I thought had the right tools for concrete work but he didnt once I found out..but it was too late the concrete truck was coming.

We used a flat piece of wood attache to a wooden pole to flatten the surface and get the water off. It left some rough marks thus is why I grinded the floor now. I didnt want it to have them rough spots especially when Im rolling over them with my creeper.

I dont know what grit the grinder stones were..I asked but the guy at the rental place didnt know

But its got a smoother texture to the concrete though now..i can still see where we drug the wood some but the grinder smoothed the humps out good enough.

 

[Armorpoxy]

Using a Diamabrush disc on a floor buffer is really not a great way to 'grind'. They rent designed for that as there isn't enough downward weight or no, and no dust shrouds, and the floating blades don't grind very flat, they tend to conform to the surface. The do work well for scratching up or prepping for epoxy and work better than etching ((priming is required if you mechanically prep).

Use of a real grinder is better if you need to smooth out broom marks or smooth out the floor and they normall come with shrouds and vacs.

 

[ricpad]

What type of finish are you going to use? Maybe a sealer or at least a densifier to prevent spills from readily soaking in.