LumberJocks

Best Tool to "Sand" Concrete Down?

  • Advertise with us

« back to Power Tools, Hardware and Accessories forum

Forum topic by wilschroter posted 07-22-2019 10:32 PM 518 views 0 times favorited 13 replies Add to Favorites Watch
View wilschroter's profile

wilschroter

89 posts in 980 days


07-22-2019 10:32 PM

I’ve got some concrete pads that had some stucco posts attached to them. I need to sand down the caulk off the concrete that was surrounding the stucco posts.

What’s the best way to attack this? Since it’s concrete (though I’m focused on the caulk) I’m afraid sandpaper will rip apart immediately the moment it comes in contact with the concrete.

I’ve got a fair amount of it to tackle, so a hand tool isn’t an option.


13 replies so far

View bandit571's profile

bandit571

23438 posts in 3138 days


#1 posted 07-22-2019 10:36 PM

Angle grinder….cone diamond wheel…

-- A Planer? I'M the planer, this is what I use

View CaptainKlutz's profile

CaptainKlutz

1645 posts in 1949 days


#2 posted 07-22-2019 11:08 PM

Rent a concrete grinder. HD and lots of folks rent them.
https://www.homedepot.com/tool-truck-rental/Concrete-Grinder-10/50200-HD/index.html
Cheers!

-- I'm an engineer not a woodworker, but I can randomly find useful tools and furniture inside a pile of lumber!

View corelz125's profile

corelz125

792 posts in 1431 days


#3 posted 07-23-2019 12:44 AM

like Bandit said one of these on a grinder. They make fast work out of grinding down concrete. https://www.amazon.com/s?k=Diamond+cup+wheel&i=tools&ref=nb_sb_noss.

View SMP's profile

SMP

1318 posts in 360 days


#4 posted 07-23-2019 01:17 AM

What do you mean by “Fair amount”. You mentioned just around some posts. That will determine if i would recommend angle grinder or renting the big machine. Btw, make sure to keep it wet to keep the dust down or it will make more dust than you can believe.

View Tim's profile

Tim

3829 posts in 2416 days


#5 posted 07-23-2019 01:52 AM

Your title says you want to sand down concrete, but the description says it’s the caulk you want to get removed. What kind of caulk and again how much will matter here. I’d think you’d want to scrape off the caulk first or it will gum up any grinding wheel you use. Though maybe not if you’re willing to dig enough into the concrete.

View runswithscissors's profile

runswithscissors

3057 posts in 2480 days


#6 posted 07-23-2019 10:24 PM

If you’re just removing caulk, I don’t see why you would need diamonds. HF has a grinding disk imbedded with carbide chunks. $10.

You might also try heating the caulk with a torch or heat gun and scraping it off.

-- I admit to being an adrenaline junky; fortunately, I'm very easily frightened

View Sark's profile

Sark

160 posts in 815 days


#7 posted 07-24-2019 01:48 AM

Heavy duty sanding disks for your 4 1/2” grinder will do the trick. You need a rubber pad. The HF stuff would work fine, and buy a grinder and the pad while you are there or at HD. It’s mandatory equipment for any DIY’er. With a different disk, you can grind the concrete, or cut metal, etc….

Also a torch and scraper should work fine too.

View jdh122's profile

jdh122

1089 posts in 3272 days


#8 posted 07-24-2019 12:39 PM

Like others said, if it’s not much concrete, a cheap masonry wheel in an angle grinder will work. Be aware that concrete dust contains silica, which is really, really bad for the lungs (http://www.dcpolish.com/concretegrindingdanger.html) Wear a mask.

-- Jeremy, in the Acadian forests

View RobHannon's profile

RobHannon

301 posts in 985 days


#9 posted 07-24-2019 01:08 PM

I would use a rub block to get the bulk off so you aren’t loading up a wheel. Something like this.
https://www.homedepot.com/p/ANVIL-6-in-x-3-in-20-Grit-Rub-Brick-57457/300976865

Once the big stuff is off you can clean up with a grinder and work pretty fast.

View wingless's profile

wingless

39 posts in 197 days


#10 posted 07-25-2019 11:36 PM

My 4,000 psi / 3.5 gpm pressure washer would remove this using the rotating turbo nozzle w/ little effort.

View Steve Peterson's profile

Steve Peterson

408 posts in 3537 days


#11 posted 07-26-2019 03:11 PM



If you re just removing caulk, I don t see why you would need diamonds. HF has a grinding disk imbedded with carbide chunks. $10.

You might also try heating the caulk with a torch or heat gun and scraping it off.

- runswithscissors

Be careful not to heat the concrete too much with the torch. Chunks could explode if there is embedded moisture.

I suggest a guy named runwithscissors should try it first. :)

-- Steve

View Myles Standridge's profile

Myles Standridge

88 posts in 3397 days


#12 posted 07-26-2019 04:38 PM

If you decide to go with an angle grinder/cup type grinding wheel and you’re indoors you should consider one of these shrouds. They’re a pain with the vac hose and visibility in infringed so it’s a bit more difficult to keep it flat and not gouge the concrete but the dust is KILLER!

They also have a 7 inch version which I think would be a bit easier to keep flat on the floor.

https://www.homedepot.com/p/Dustless-Technologies-5-in-Universal-Dust-Shroud-Pro-for-Angle-Grinders-D1805/206024974

View Bill1974's profile

Bill1974

131 posts in 3440 days


#13 posted 07-30-2019 05:30 PM

look at www.diambrush.com

I have used the this (https://diamabrush.com/product/hand-tools/) to remove thinset, mastic and paint from concrete and it worked pretty well. You will want to have some dust collection on the angle grinder and wear a respirator too.

I tried concrete polishing and grinding discs but they did not work well to just get off what was on the concrete, they either did very little or dug in to much.

these do work best on smooth hard concrete, if the concrete is rough or soft, it will dig in if you are not careful. Also a variable speed angle grinder seemed to work best at slower speeds and the blades lasted longer too.

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com