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Mar 4, How To Fix Cracks In Concrete Floors – diy repair kit, guide & video

How to fix cracks in concrete floors, slabs, driveways, and patios. I’m going to show you my step by step guide and video for repairing concrete cracks.

Republished by Plato



This page will teach you how to fix cracks in concrete floors, slabs, patios, and concrete driveways.

Let’s face it, cracks in concrete floors are quite common. But, knowing how to repair a concrete crack isn’t common knowledge. 

Until now!

I’m going to share with you my easy step by step guide for fixing cracks in concrete. This guide will work for all types of concrete flat-work (floors, slabs, driveways, patios, and pool decks).

What you’ll need for tools

Here’s a list of the tools you’ll need to fix your cracked concrete.

  1. Shop-Vac
  2. Putty knife (1 or 2 inch wide will do)
  3. 1 Quart measuring cup
  4. Single tube caulking gun
  5. 4″ Hand grinder (what I recommend using) or
  6. Concrete rubbing stone (rather use the grinder) or
  7. Palm sander with 60 grit paper (again, i’d rather use the grinder)

You’ll need a way to smooth out the repair material once it is dry. I prefer the 4″ hand grinder with a diamond cup wheel. 

You can use a rubbing stone or a palm sander if you want, it’s just not as fast and takes a little more effort to smooth out the repair material with these tools.

What to use for a crack repair kit

When I repair cracks in concrete like the one in the picture above, I always use CrackWeld Concrete Floor Repair Kits from RadonSeal.

I buy the PRO KIT Duel Cartridge’s because my company, Day’s Concrete Floors, Inc specializes in concrete crack repair.

If you buy the PRO KIT, it comes with that duel cartridge caulking gun. If you buy the diy CrackWeld kit, you use your own caulking gun and use a single cartridge at a time. 

You use the same methods and same techniques with each kit to produce the same results.

What is CrackWeld?

CrackWeld is a 2-part polyurea repair material. When you eject the material out of the cartridge and through the mixing nozzle into the crack, it quickly reacts and cures rock hard.

You don’t need to widen or “chase out” the crack. The repair material bonds with the sand to form a “concrete like” mass inside cracks, spalls, and holes.

Water, vapor, or other liquids and gases can not penetrate it. It’s also considered a structural repair material, it will stop a crack from any further movement.

How to fix a crack in a concrete floorStep 3 – Pour silica sand into the crack and add more CrackWeld to it.

How many cracks can I fix with a kit

Assuming the concrete floor thickness is 4 inches:

If the crack is 1/16 inch wide:

  • diy CrackWeld kit will repair 50 lineal feet
  • Pro CrackWeld kit will repair 100 lineal feet

If the crack is 1/8 inch wide:

  • diy CrackWeld kit will repair 25 lineal feet
  • Pro CrackWeld kit will repair 50 lineal feet

If the crack is 1/4 inch wide:

  • diy CrackWeld kit will repair 12.5 lineal feet
  • Pro CrackWeld kit will repair 25 lineal feet

How to fix you’re cracked concrete floor

IMPORTANT: The inside of the crack must be clean and dry!

  1. Vacuum out the crack to remove any dirt, debris, and loose concrete.
  2. Inject the CrackWeld resin into the crack to “prime” the crack and wet the inside edges of the crack.
  3. Put the dry silica sand (included in the kit) into the 1 Qt. measuring cup and pour the sand over the crack, pushing the sand into the crack with the putty knife.
  4. Squirt some more CrackWeld resin over the top of the sand (enough to make a paste with the putty knife) and continue to push into the crack until the crack is slightly over filled.
  5.  I like to wait about 20 minutes and grind the hardened CrackWeld repair smooth and even with the concrete floor, using a 4 inch electric hand grinder with a diamond cup wheel.

If you don’t want to use a diamond grinder:

  1. Scrape off most of the excess repair material after about 10 minutes, using the putty knife.
  2. Then, after another 10 minutes, use the concrete rubbing stone or the palm sander to smoothen the repair material even with the concrete floor.

How to fix cracks in a concrete floorStep 4 – Making a paste with the putty knife and forcing it into the crack

If you want printable instructions and the cartridge assembly guide

Here’s a PDF guide for the DIY Concrete Floor Repair Kit.

You can Download the installation instructions and cartridge assembly guide.

This guide shows you how to put the cartridge, backflow restrictor, and mixing nozzle together. (these instructions come with the kit also)

It also has the basic instructions for repairing a crack.

I would definitely recommend watching the video. You know what they say, if a picture is worth a thousand words a video must be worth a million.

how to repair a crack in a concrete floorStep 5 – Grind off the excess repair material or scrape and sand it off

How to fix cracks in concrete – Using CrackWeld’s Pro repair kit

What if it’s just a hairline crack?

If you’re concrete floor has a hairline crack, you won’t need the sand to repair this one.

Just make two passes with the CrackWeld resin and that should be enough to fill and repair the crack.

Use the putty knife to push any excess resin into the crack if you need to.

After about 20 minutes, sand the excess resin off the floor.

What if the crack is larger than 1/4 inch wide

When I fix a crack in concrete that’s larger than 1/4 inch wide: After I vacuum out the crack, I always pour some dry silica sand into the crack first, filling the crack to about 1/8 inch below the surface of the floor.

This keeps the CrackWeld resin from just running out of the bottom of the crack. Then follow the instructions in the guide above starting with step 2.

Finished concrete crack repairRepaired crack after grinding with a 4″ grinder

Can I use CrackWeld to fix concrete spalling and small holes?

YES, to fix spalled concrete:

  1. Clean and remove any loose concrete
  2. Flood the spalled concrete area with the CrackWeld material
  3. Immediately broadcast silica sand into the repair material (a light broadcast of sand, not too much) and let dry completely
  4. When dry, grind or sand smooth

YES, to fill holes and chipped areas of concrete

  1. Clean the area and make sure it is dry
  2. Squirt some CrackWeld into a mixing cup and add silica sand
  3. Use a paint stick and mix into a “peanut butter consistency” like paste (use as much sand as you need to)
  4. Fill the hole or chipped area using a putty knife and the repair paste.

Only mix small amounts at a time, you will only have about 5 – 10 minutes of working time.

Where else can I use this crack repair kit

CrackWeld concrete crack repair can be used for:

  • Industrial and Commercial concrete floors
  • Heavy vehicle garage floors
  • Parking Garages
  • Concrete Patios
  • Basement Floors
  • Factory Floors
  • Freezer Floors
  • Concrete Driveways
  • Residential Floors
  • Concrete Overlays

Can I paint over the crack after it’s repaired?

YES, after you grind or sand the crack repair material smooth, you can paint, epoxy, or use a concrete overlay material over it.

Can I use CrackWeld to fill expansion joints

NO, CrackWeld is a rigid crack repair material. It dries very hard. Do not use it to repair expansion joints or floor to wall joints. It’s not for joints that require some sort of flexibility.

For repairing joints that require flexibility you can use RadonSeal’s Elastipoxy Joint and Gap Filler Kit.

Can I use CrackWeld to fix cracks in concrete that might still have movement

If you live in an area where you have freeze/thaw cycles and you have exterior concrete with some cracks you want to repair:

Like in a concrete driveway, pool deck, or patio.

Then I recommend you use Elastipoxy to repair the cracked concrete.

Elastipoxy will allow for some movement of the concrete (it dries flexible) without breaking down.

It’s a very strong 2-component, 100% solids, flexible, AND self-leveling crack repair product. (making it easy to install)

Why shouldn’t I use a “big box store” concrete crack repair product?

Unlike some of the “big box stores”

CrackWeld has some very good advantages: “This is why I use it”

  • DRIES STRONGER THAN THE CONCRETE – It bonds or welds the concrete back together.
  • VERY FAST CURING – Dries in 15 – 20 minutes so you have very little down time.
  • NO CHASING OR ROUTING NEEDED – You don’t have to grind or chisel the crack open
  • FILLS HAIRLINE CRACKS EASY – Water like viscosity, it self levels and comes with a needle nozzle for precision accuracy.
  • CURES BELOW FREEZING– You can repair cracks in below freezing temperatures

“There’s absolutely no comparison, don’t waste your money on the “big box” store’s crack repair products. Take it from a pro, RadonSeal’s CrackWeld will get the job done as advertised.”

Mike Day

Owner of Day’s Concrete Floors, Inc.

YES I want the diy CrackWeld repair kit. (You’ll go to RadonSeal’s page)

YES I want the CrackWeld PRO kit. (You’ll go to RadonSeal’s page)

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If you liked this, please share.  Thanks!



How is Sand Used in the Construction Industry?

Contrary to popular belief, there are several different forms of sand on this earth.  Some are engineered for specific construction purposes, and others are completely natural.  Sand has been used for many different purposes since the beginning of time, and is especially useful to the construction industry for many reasons.  Sand uses in the construction
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<br /> How is Sand Used in the Construction Industry? | Port Aggregates

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3 Reasons to Use Concrete for Your Commercial Construction Project

Did you know that concrete is the most frequently used man-made material in the world? This material is extremely popular in commercial and industrial construction projects as well as residential renovations. If you’re starting a new commercial project or looking to revamp the appearance of your business, you’ll want to consider using concrete for the
Read more

The post 3 Reasons to Use Concrete for Your Commercial Construction Project appeared first on Port Aggregates.

Republished by Plato



<br /> 3 Reasons to Use Concrete for Your Commercial Construction Project | Port Aggregates

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Feb 16, Concrete Yardage Calculators – How Much Do I Need For Any Type of Job

Find the perfect concrete calculator to figure cubic yardage (and cubic meters) for any type of concrete project. Floors, slabs, walls and much more.

Republished by Plato



Calculate concrete cubic yardage for slabs, walls, footings, columns, stairs, blocks, curbs, and gutters using the many different concrete calculators on this page.

Estimate the volume and weight of concrete you’ll need for any given area.

Figure out how many cubic yards of concrete you need in both US units of measure (feet and inches) and International system of units or metric units (meters and centimeters) of measurement.

Concrete calculator


The best way (and fastest way) to calculate concrete yardage is using a concrete calculator.

These concrete calculators are very accurate and will help you determine the volume of concrete you need for the type of project you’re doing.

Always add a little extra to the quantity estimated just to be on the safe side. 

Rarely is any concrete project perfect and you don’t want to be left short on the amount you need.

You’ll be able to calculate concrete cubic yardage, weight, and how many bags you need for:

  • Concrete slabs
  • Concrete Walls
  • Concrete Footings
  • Circular slabs or Tubes
  • Columns or Sono-tubes
  • Concrete Curbs and Gutters
  • Concrete stairs

Concrete calculator formula for a slab or floor

If you want to use a formula to calculate concrete volume, I have a whole page like the picture above that shows you a written formula for:

  1. Square or Rectangular Slabs
  2. Round Slabs
  3. Concrete Walls
  4. Concrete Footers
  5. Square Columns
  6. Round Columns
  7. Concrete Stairs and Steps
  8. Concrete Curbs and Gutters

Concrete calculators for specific applications

Use the concrete calculators below to help you determine concrete yardage for your specific project.

Use the calculators above for estimating purposes only.

Always double check your calculations when you figure concrete for a project. Not having enough concrete to finish can be both frustrating and problematic.

Concrete is made from aggregate (stone), sand, cement, and water.

You can make your own concrete using the raw materials and my concrete mixing ratio formula or you can buy pre-mixed concrete in bags that you just add water to.

For large projects, ordering concrete from a ready mix concrete company is usually easier and faster. 

Learn how to do your own concrete slab by taking my concrete slab course.

The concrete calculator APP for the Iphone and Android smartphone is terrific! I use it daily. The free desktop download is courtesy of Meet-Mr-Concrete.

Learn how I check the sub-grade to find the average thickness of a concrete floor on either the floors or slabs calculator page.

When I order concrete from a ready mix company, I always add 1/2 to 1 yard more than what it says on the calculator.

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