Can You Sand Concrete? How?

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Sanding concrete floor, countertop, and vase.

Concrete is sturdy, fairly versatile, and cost-effective – getting used to type driveways, sidewalks, inside flooring, counter tops, and quite a few different merchandise, and it’s extra standard than ever earlier than. Be part of me as we be taught concerning the ways in which concrete can add worth and sweetness to your house, and how one can save 1000’s of {dollars} by doing your personal concrete work relative to hiring an expert.

Are you able to be taught some “onerous” classes about concrete?

OK – let’s get rockin’!

Associated: Can You Sand Veneer? | Can You Sand Caulk? | Can You Sand Epoxy? | Can You Sand Glass? | Can You Sand Plywood? | Can You Sand Particle Board?Can You Sand Moist Wooden?

Can You Sand Concrete?

Grinding or sanding concrete floor

Earlier than we go any additional, the reply is a giant fats YES – you CAN sand concrete. Nonetheless, the method isn’t the identical as sanding a chunk of wooden, plastic, or steel. Concrete is its personal animal, and it requires specialised instruments, and a little bit of insider data, to attain the perfect outcomes when sanding.

Preserve studying…

Why Sand Concrete?

There are a great deal of causes for sanding concrete, like eradicating imperfections on the floor, eradicating stains or coatings, repairing cracks and pits, and sharpening to attain a glasslike end. Let’s look nearer.

Eradicating Imperfections

 Grinding terrazzo concrete countertop

Made by mixing water, cement, and an combination (sometimes gravel), concrete is super-durable. Generally, after curing, concrete has imperfections like sharp edges or combination protruding from the floor that would journey somebody or injury tires. You may treatment these points with sanding to reinforce look and enhance security.

Stain or Paint Removing

Generally, outdated paint, oil stains, and different floor contaminants penetrate into concrete too deeply for detergents and solvents to take away. In lots of of those instances, sanding can take stains out that different strategies can’t contact. Plus, sanding concrete entails no poisonous chemical compounds, which is all the time factor.

Concrete Repairs

Woman sanding a concrete vase.

You would possibly must sand your concrete after repairing cracks or pits with any of the assorted forms of fillers. The medium will want sanded flush with the floor to take care of smoothness and improve its look.


Most individuals who sand concrete accomplish that to reinforce the completed texture and look. In case you’re planning to use paint or stain, then sanding accommodates higher floor adhesion.

And in case you’re not portray or staining, then sanding and sharpening are wanted to attain essentially the most enticing look. Whether or not you need a glasslike polished end or an exposed-aggregate look, sanding’s a should.

PRO TIP 1: Concrete will be dry sanded or moist sanded. Dry sanding tends to be extra frequent, however I positively choose moist sanding and sharpening. It makes a large number and requires clean-up, however I’m a clear freak anyway.

Additionally, cleansing up the moist mess, to me, is significantly better than coping with microscopic mud particles that go EVERYWHERE, together with inside my respiratory tract! IMO, moist sanding concrete (and drywall) yields superior, extra fluent outcomes.

Step-by-Step Information to Sanding Concrete

OK – let’s get into the steps to take when sanding concrete. After all, there will probably be variations in your method relying on in case you’re sanding a small countertop, the ground in your storage, or your total driveway. Nonetheless, the essential steps stay the identical.

Able to sand some creet? Let’s go!

STEP 1: Selecting the Correct Instruments for the Job

DeWalt DWE46253 Concrete Surface Grinder

There are numerous forms of concrete sanding instruments, and the sort you’ll want, once more, will depend on the character of your mission. Sanding and sharpening counter tops or concrete furnishings sometimes solely requires a handheld concrete polisher, which is kind of like a right-angle grinder.

Comparatively, in case your mission is bigger, like exposing the mixture in your storage flooring, you might be in all probability greatest fitted to renting a stand-up walk-behind concrete finisher with a big rotating sanding disc beneath.

And if in case you have an enormous mission, like refinishing a ¼-mile-long driveway, for example, you must take into account pricing a business concrete grinding machine, plus a talented operator.

PRO TIP 2: Notice that sandpaper used on wooden, plastic, and steel is not going to work effectively for sanding concrete. As soon as you establish the perfect instrument for the job, you’ll want to find out the perfect grit of diamond concrete sanding or sharpening pad to make use of.

One of the best grits to your mission will rely in your particular objectives. And like when sanding wooden, you’ll want to start out with a rough grit and work your method as much as the grit that delivers the supposed end.

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STEP 2: Get Your Gear Prepared and in Place

Clear your work space of any pointless gadgets, stretch extension cords the place wanted, lay your instruments out the place they’re simply accessible, and get your security gear (goggles or security glasses, respiratory safety, gloves, ear plugs, sturdy sneakers, outdated garments) ready for while you’re prepared to start sanding. A little bit further time spent prepping will yield simpler work, fewer complications, and a greater completed product.

STEP 3: Shield the Work Space

Dry sanding concrete is an extremely dusty course of. In case you have indoor concrete sanding to do, you’ll must:

  • Place drop cloths on the ground
  • Meticulously masks the work space off with plastic
  • Transfer all furnishings and different gadgets out of the work space
  • Guarantee that you’ve skilled respiratory safety gear
  • Decide if you should use a moist sander to attenuate mud creation

PRO TIP 3: In response to Arthur Ross from Superior Building & Transforming:

If you’ll dry sand concrete indoors (not advisable), then please don’t skimp on dust-proofing your work space. Be very thorough when masking the realm off. Have your vacuum system arrange and ensure it’s working correctly to maintain the mud transferring both exterior the house or right into a HEPA filtration unit. And please put on professional-grade respiratory gear. You solely get one life!

STEP 4: Prep the Concrete Floor

Take your time with this step. First, clear all particles and stains off of the prevailing concrete to be sanded. If it’s new concrete with no stains or imperfections, then you definitely’re good to go. Nonetheless, if you should fill cracks or holes, take away stains, or in any other case improve the pad, that is the time to take action.

I requested veteran concrete restorer, David Peck from Impeccable Building in Heath, Ohio, the easiest way to prep a concrete pad for sanding. He defined:

Clear the concrete with water and a stiff brush, and if it has robust stains that water can’t penetrate, strive ammonia or hydrogen peroxide. After the concrete is sufficiently clear, permit it to dry very completely. Trace: Followers pace up drying occasions.

STEP 5: Sanding and Sprucing

 SCOTTCHEN Diamond Sanding Disc

Like sanding wooden, sanding concrete entails figuring out the perfect grit to start the method with. And keep in mind that you don’t use conventional sandpaper for concrete sanding, you utilize metal-bonded diamond sanding discs. Non-diamond sanding merchandise are sometimes not sturdy sufficient to face up to the abusive technique of sanding onerous concrete.

Be sure you rigorously learn the directions that include your concrete polisher or no matter different instrument you’re utilizing to sand with. Bear in mind the outdated saying: If all else fails, learn the directions!

In case you’re going to be sanding concrete that has scrapes, scuffs, and different anomalies, then you definitely’re in all probability good to start out out with a 40 grit grinding disc. Be meticulous when making your first move, guaranteeing that you just cowl your entire sanding space from nook to nook.

Take your time with each transfer. Be thorough. Do glorious work!

After you make the primary move, cease and clear up. Run a vacuum, wipe up moist sanding slop, and restore the integrity of your work space. Cleanliness enhances security and results in a greater completed product.

Now, transfer as much as a finer grit quantity, like an 80 grit, and repeat the method. Then, step as much as 150, 200, after which 400, if a really polished floor is your objective. And on that notice, you should buy diamond sanding discs with grit numbers as excessive as 5000 (5 thousand).

After all, you may cease at any level of roughness you need. It’s your concrete!

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STEP 6: Clear-Up & Apply a Hardener/Densifier

When you could have achieved the diploma of smoothness you need in your concrete, take a while to completely clear the work space once more. I can’t stress sufficient how essential it’s to take care of a clear and protected workspace. It actually issues by way of staying wholesome and delivering a top-notch product.

When the concrete is cleaned and really dry, apply a high quality concrete hardener, sealer, and densifier based on the directions supplied on the container.

Sodium silicate within the hardener reacts with the free lime within the concrete to make calcium silicate hydrate, which subsequently acts to fill within the pores of the combination, leaving the pores fully sealed or a minimum of smaller than they have been.

This course of considerably will increase the hardness of the countertop, flooring, sidewalk, or driveway, making it rather more immune to cracking, chipping, staining, UV hurt, and different injury.

OK – TADA! You probably did it – you sanded, polished, and sealed your personal concrete! That’s fairly badass!

Remaining Ideas About Whether or not You Can Sand Concrete

Properly, now, you already know the reply is YES, you may sand concrete. I can’t stress sufficient the significance of growing and sticking to plan on each mission, whether or not it entails sanding concrete or not. Each mission finally ends up higher with plan, considerate motion, tidiness, security, and meticulousness.

Thanks a lot for studying alongside and studying about among the nuances of sanding concrete. There are such a lot of issues you are able to do to economize relative to hiring a contractor. It simply takes some studying, experimentation, and dedication to attaining professional-grade outcomes, even in case you hit a couple of speedbumps alongside the best way.

Rock on!