What is a mag trowel?

Magnesium and Aluminum Hand Floats

A mag float is simply a flat piece of magnesium or aluminum attached to a handle. The tool allows the user to float concrete at his or her desired pressure and angle. Mag floats are also available in a wide range of lengths and widths.

What is the difference between a float and a trowel?

A float has a thicker base than a trowel and is usually made of plastic, sponge, rubber, wood or magnesium – a lightweight pale grey metal. It's used to even up the surface on plaster or concrete, make it firmer and give whatever texture is required. The finish will depend on the float chosen.

How do you use a concrete mag float?

Once your top is flat from screeding, use a magnesium float to flatten and smooth the top while opening the pores of the fresh concrete, allowing bleed water to evaporate and air to escape. Once the concrete is firm enough and all bleed water has evaporated, use a steel trowel for your final finish.

How long after pouring concrete can you float it?

Allow all of the water to disappear before you do anything else. This can take 20 minutes or 4 hours depending on the temperature, humidity and how hard the wind is blowing. After the bleed water is all gone you can get out your steel finishing trowel and put on the final touches.

What can I use instead of a bull float?

Bull Floats and darbies serve the same purpose however, daries are typically use for small areas. Both are used to eliminates high and low spots, and to slightly embed large aggregate particles immediately after strike off. These floats will also work up more paste to the top of the slab to help in finishing later.

How to use a Mag Float 

How often should I wet new concrete?

To put it simply, the goal is to keep the concrete saturated during the first 28 days. The first 7 days after installation you should spray the slab with water 5-10 times per day, or as often as possible. Once the concrete is poured the curing process begins immediately.

How do you make concrete smooth after it dries?

What is Devil float?

A devil float, also known as hand float, contains nails that slightly stick out at one end and is used to roughen the surface of plaster to provide a key for the next coat. It can also be used to get rid of any bumps.

What does a Fresno do to concrete?

A Fresno trowel is used in the final stages of the finishing process to seal a smooth concrete surface prior to drying. Fresno's can be used to cover larger areas and eliminate time consuming use of a finishing trowel.

How do you know when to float concrete?

Float the concrete when you're done grooving and edging (Photo 6). Floating removes the marks left by edging and brings the surface one step closer to a final finish. You may have to bear down on the float if the concrete is starting to harden.

What is a Darby in concrete?

A darby is a long, flat tool used to smooth in plastering and rendering. It can also be used on concrete floors. It consists of two handles on a flat plate with slightly lipped edges. A darby is similar to a float, except larger.

Do I need a finishing trowel?

A finishing trowel is an important tool for many types of construction. It's used to smooth out materials like mortar, plaster, and concrete. It has a very straight, angled blade designed to fit precisely into right angles and smooth out the surface of the mixture in straight lines.

What can I use instead of a trowel?

A hori hori knife is also known as a soil or weeding knife, and is the Japanese equivalent of a garden trowel. It has a serrated blade for cutting roots, and a wider blade than other garden knives for digging soil.

How do you make concrete smooth and shiny?

If the concrete floor is sloped, self leveling cement can be applied to make the surface even. Ardex or other similar self leveling cementitous mixes can be applied and poured on to the surface and then ground afterwords just like regular concrete to get a smooth shine.

Is there a way to smooth rough concrete?

The best way to do this is by combining 7 parts resurfacer with 1 part water in a 5-gallon bucket. Mixing is best accomplished using a paddle mixer attached to a power drill. Fill in the cracks and divots with your freshly mixed resurfacer and smooth it all out with a finishing trowel.

How do you remove footprints from concrete?

Use a floor machine with a black pad and scrub, scrub, scrub the surface. Your goal is to get as much of the stain off the entire floor as possible. Yes, it's like starting all over. (The footprints will still show up, but will be much lighter.)

How long does 4 inches of concrete take to cure?

While it only takes around 28 days to cure concrete, drying can take months. The general rule of thumb is that concrete takes about 30 days to dry for every one inch of slab thickness.

Can you leave concrete forms on too long?

In short, there is no such thing as leaving concrete forms on for too long, as they will simply continue the curing process as the forms remain in place. However, there is no real need to leave forms on for longer than necessary.

Can I pour concrete over 2 days?

Although concrete will harden soon after pouring, it's still susceptible to damage from weight during the first four weeks. Wait at least 24 hours before allowing foot traffic, including pets, on a newly poured sidewalk or slab, and don't drive a vehicle on a new driveway for at least 10 days.

How long does it take concrete to fully cure?

In fact, concrete gets stronger and stronger as time goes on. But, as far as we're concerned, to reach a practical strength, most industrial concrete mixes have a 28 day curing period.

What may occur if a slab is floated too soon?

More often, premature finishing or improper first (bull floating) or second floating results in trapping rising bleed water and air below the top surface of the concrete (Image 2). When this occurs, the resulting weak or soft zone below the surface causes the top surface of the concrete to flake or scale off.