Saw Cut vs. Tooled Control Joints: Which is Better in Arizona?
Concrete is going to crack, no matter what you do. This is due to shrinkage and other reasons like temperature changes, especially in hot climates. That’s why control joints are so important. But the question is: should you tool in the joints by hand when the concrete is still wet, or cut them later with a saw after it’s hardened?
Because of the heat in the Arizona valley and desert areas, cracking can begin even earlier in your concrete, so it may be best to get your control joint in right away with a hand tool. But ultimately, it does come down to aesthetics and personal preference.
We’ll explore the advantages and drawbacks of both tooled and saw-cut joints to help you make the right choice for your project.
Why You Need Control Joints
Control joints are essential for managing where and how your concrete cracks. Without them, your slab would crack randomly as it shrinks during the curing process.
These cracks can be ugly and may weaken the concrete. By adding control joints, you’re essentially giving the concrete a path to where it should crack.
In Arizona, where extreme heat can cause concrete to dry and crack faster, it's important to be aware of this going into the project to decide what is best for you.
Tooled: Groove Tool Control Joints
One method for installing control joints is to use a groover or hand tool to create the joint while the concrete is still wet. This method has the advantage of getting the job done all at once—no need to come back later to saw-cut the joints.
This approach is especially useful during Arizona’s summer when the concrete might start cracking before you have time to saw it. By putting in the control joint as soon as the concrete is poured, you reduce the risk of having it crack where you don't want it.
Some people prefer the look of tooled joints because they have a rounded, smooth appearance.
The aesthetics of a tooled joint can fit nicely with residential projects like patios and driveways.
If you look around Arizona, you will notice most sidewalks, driveways, and patios use tooled joints.
But the quality of a tooled joint relies on the skill of the finisher. If the person grooving the concrete isn’t experienced, the joints might not come out as clean and even. To find skilled contractors here in the Phoenix Metro Area, check out how to find the best concrete contractors here in the valley.
On the downside, tooled joints usually don’t go as deep as saw-cut joints. Typically, they are around 1/2 to 3/4 inches deep, depending on the client’s preference.
This depth matters because if the joint isn’t deep enough, it may not fully control where the slab cracks.
Another issue is that the rounded, wider joint allows more debris to get trapped, making it harder to clean.
Saw-Cut Joints
The other option is to cut the control joints into the slab after it’s poured using a diamond saw blade. This method allows the concrete to set up before the joint is cut in, which some contractors prefer.
Timing is important though. In Arizona, saw-cut joints should be done within 4 to 12 hours after the concrete is poured, depending on the temperature and the mix used. If you wait too long, the concrete may crack before you can cut the joints.
Saw-cut joints tend to be more expensive because they require an extra trip to the site and specialized equipment. But they can offer a cleaner, more structured look.
The saw-cut joints are typically smaller and more precise, which appeals to people who prefer a sharp, polished appearance. They also tend to go deeper than tooled joints, usually about 1/4 of the slab’s thickness or more, giving better control over where the slab will crack.
One downside to saw-cut joints is the potential for chipping along the edges.
Tooled joints may slightly wear down over time, especially if the contractor used a lot of cream to get perfect-looking joints, but saw-cut joints can suffer from more noticeable damage on the squared edges.
Despite these challenges, saw cuts are often the best option for large-scale projects like parking lots, warehouse floors, or airport runways, where tooled joints simply aren’t practical due to the size of the slab.
The industrial look of saw-cut joints also fits well with modern, minimalist aesthetics and can be a great choice for residential jobs where you want a more structured appearance.
So What Should You Use?
Since we are in Arizona and often dealing with extreme heat, tooled joints may be the better option for smaller residential projects like patios, driveways, or sidewalks. The main benefit is that they allow you to control cracking as soon as the concrete is poured, reducing the risk of unwanted cracking patterns.
For larger projects or those where you want a crisp, precise finish, saw-cut joints could be the way to go. Although they take more time and equipment, they offer a more structured look that some homeowners may prefer.
Ultimately, the decision comes down to the size of the project, the look you’re going for, and how quickly you need to manage cracking.
PRO-TIP: You Can Use Both Methods
If you want the best of both worlds, you can actually use a combination of both techniques.
First, tool in the joint with a groover while the concrete is still wet.
Then, use a trowel to cover up the joint.
After enough curing, come back and saw-cut where it had been grooved. This way the groover helps push the rocks out of the way, making for a stronger finish at the edges and reducing the chances of the squared joint edges chipping.