Watching someone pour and finish concrete is much different from finishing it yourself. You know you’ll need concrete, a shovel, and a trowel, but what else should you use? The intricacies of properly and professionally finishing concrete take time to master, so it’s okay for even the experienced general contractor to read up on techniques and take notes.
Required Tools for Finishing Concrete
- Concrete Mix – Obviously, right? We’re just making sure all of our bases are covered.
- Bucket – A five-gallon bucket works beautifully to mix concrete.
- Concrete Mixer – An electric concrete mixer will make the job easy. A wheelbarrow mixer or towable concrete mixer would be best for larger jobs.
- A long 2×4 for leveling – Any straight 2×4 will work. Make sure it is long enough for the job.
- Bull Float or Darby – To flatten edges that may be left after you initially flatten the concrete with the 2×4.
- Hand Float or Magnesium Float – To create that perfect, flat surface and smooth finish. The magnesium float is best for air entrained concrete.
- Edging Tool – Don’t just leave the edges unattended. You’re going for a perfect finish; make it perfect.
- Straightedge or Snap Line – The best way to make straight lines before edging or grooving concrete.
- Grooving Tool – Grooves help give concrete that perfectly finished appearance, but they do much more. Grooving concrete helps control cracking.
- Concrete Dye – Color your concrete or create designs during the finishing process. You can make concrete look like a variety of things including rock, brick, or marble.
- Broom or Concrete Brush – Concrete that has been troweled to perfection looks amazing, but it also creates the potential for serious accidents. The perfectly flat and smooth surface presents a slip and fall hazard when it is wet. Creating a texture helps prevent future accidents.
1. Make it look Finished
We feel that this tip is the most important, even if it isn’t an actual step in the process; so we’ll start here. We all want our workmanship to be remembered as quality work, not just a load of concrete poured into a square or other predetermined shape. Never walk away from a job without making sure it looks professional and with a feeling of pride in your work.
2. Choosing and Mixing Concrete
Keep in mind that not all concrete is created equal. Some types of concrete handle extreme temperatures better than others where some can take on more weight. Make sure the concrete you choose to use fits the purpose for which it is required. You’ll want to use at least a 3,000 PSI concrete for sidewalks and driveways, but the best concrete for heavy loads is at least 4,000 PSI.
Mix the concrete exactly like the instructions recommend. You’ll always get the best results when you measure and mix precisely instead of going by eye.
3. Pouring, Tamping, and Troweling
There really isn’t a specific rhyme or reason when you’re pouring concrete. You do, however, want to make sure there are no bubbles that will cause craters later.
Tamping, or compressing, is rarely needed with many types of concrete mixes today. Tamping some types of concrete can weaken the slab and ruin the project. Double check the type of concrete mix you’re using before tamping.
Troweling concrete isn’t the easiest job. When you’re ready to trowel, use a wooden trowel or magnesium float to smooth the surface. Keep in mind that some texture is a good thing, especially in an area that may be exposed to water or the elements.
One thing you can do to finish the surface of your concrete if you’re unhappy with your troweling job is to use a broom. All you have to do is lightly drag the broom across the surface of the concrete until it is flat. Get an old broom and be prepared to replace it if you don’t clean it quickly. A broom-finished concrete surface offers much more traction on wet concrete than a smooth, trowel-finished surface.
4. Know When to Finish
Inexperience in finishing concrete often leads to one of two mistakes – troweling too soon or too much. Both of these mistakes pull too much water to the surface. You end up with a white, dusty, cracked surface. Concrete sets more quickly on warm days, so make sure to work at a pace that is appropriate to the weather.
5. Work Bleedwater Back into the Concrete
Water will rise to the surface of the concrete while it is setting, but don’t allow the water to evaporate. Work the surface with a trowel to work the water back down into the concrete to prevent dusting, scaling, and cracking.
6. Add Color
Many contractors have learned the art of being creative with finished concrete. We’ve seen some pretty impressive finished concrete that resembles marble, stone, brick, or tile. All it takes is some colored concrete dye and some serious dedication to perfecting your work.
7. Protect Your Concrete
Apply a sealant to the concrete after it is finished, dried, and cured. A good sealant will protect the concrete for 3-5 years if it is properly applied.
Places You Can Use Concrete
You can use concrete for many applications including:
- Basement Flooring
- Utility Room Flooring
- Warehouse and Commercial Flooring
- Mailbox Pads
- Dog Runs
Property owners tend to love the simplicity of concrete. It’s an easy and relatively inexpensive project, and one that can let the artistic general contractor show off their skills.