Is Using a Concrete Grooving Tool Enough To Create Reliable Control Joints?

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Is Using a Concrete Grooving Tool Enough To Create Reliable Control Joints?

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Күн бұрын

In this video I share a tip I utilized in a recent concrete patio build project to better ensure my concrete control joints would work as designed. Concrete surface control joints are often made with a concrete grooving tool shortly after concrete is poured. The problem is sometimes the grooving tool does not make a deep enough groove in the concrete floor surface to serve as a reliable breaking point. My solution is to address the problem before the concrete is poured by placing a structure underneath the area where the grooving tool will be used. The idea is to thin the concrete even further under the control joint made by the grooving tool. In my demonstration I use HardiePlank boards to create the additional concrete void underneath the area where the concrete groove tool will be used.
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DIY Concrete Patio 2 (with bagged concrete) = • Pouring a Concrete Sla...
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DIY Concrete Patio 8 (concrete control joint tip) = • Is Using a Concrete Gr...
DIY Concrete Patio 9 (best way to mix concrete) = • The Best Way to Mix Co...
The purpose of a control joint in a concrete surface is to create an breaking point in the concrete where the break is minimized or even completely hidden by the control joint. The point is concrete slabs are likely to have stress forces applied to them that will cause cracking. A proper control joint creates a weak spot in the concrete which encourages a crack to happen there, where it will not be noticeable.

Пікірлер: 31

@TroydaBoy6160 2 жыл бұрын

That hand jointer you are holding is called a dummy jointer. It's made to make dummy joints, more or less for looks only. I personally have 1/2" jointers I use. By doing what your doing you are actually weakening the concrete slab in general. My advice is just saw cut and pick up a nice V wheel to pretty them up with a day or 2 after you pour.

@MrKistel 2 жыл бұрын

Thanks for your inputs

@brokentombot 2 жыл бұрын

I agree with you.

@treetop5752 2 жыл бұрын

I have MANY times used the spin screed chairs and 1/4×2 steel for control joints in thick slabs. You just grease the steel good and pull them out right before final pass with steel trowel

@MrKistel 2 жыл бұрын

Thanks for sharing the tips. The steel plate for concrete control joints sounds like a great practice.

@GlenHoffmanX 4 жыл бұрын

I always enjoy your tips!

@MrKistel 4 жыл бұрын

Thanks as always Glen, Bring your gloves for the retaining wall project!!

@chris_topher1984 4 жыл бұрын

your concrete pad looks awesome. it keeps growing and spreading like it's alive haha. maybe it will wrap itself around the sides of your house one day.

@MrKistel 4 жыл бұрын

Thanks Chris, I think the concrete patio has steadied its growth rate however now we may be doing a retaining wall or a terrace configuration.

@emmacova2203 4 жыл бұрын

Concrete will attach in top of paint.? Is for my chiminey I painted White now I wantes concreate look. Chimney is made rock s???

@MrKistel 4 жыл бұрын

Not completely sure I understand the question but if it is just a color change you are after I would think a good quality paint might be a good approach. I am sure you can find something with a concrete color and could possibly even texture it to have somewhat of a concrete pattern.

@usheringtaurine5158 4 жыл бұрын

My driveway doesn't have any control joints and was poured today. It is fairly large. Is this normal?

@MrKistel 4 жыл бұрын

My guess is the concrete company will come back tomorrow to cut in the control joints in the concrete driveway. They can be cut in if not grooved in during the pour process, however the cuts should be made as soon as possible.

@usheringtaurine5158 4 жыл бұрын

@@MrKistel ok thank you for the reply. I'll keep an eye on it. Hopefully tomorrow

@jayc4715 Жыл бұрын

@@usheringtaurine5158 did they go back and cut them or did they take your money and run?

@painlesstom Жыл бұрын

Or you could have just poured the whole thing the same thickness and left the joint groove out... That's not a big slab. I've done dozens that size and haven't had any of them crack, and I'm driving a crew cab Silverado on them regularly.

@MrKistel Жыл бұрын

if I thought I could have mixed the concrete fast enough I might have done that.

@umbertogalasso1280 2 жыл бұрын

As a concreter for 44 years that's not how you do it pass the dummy joint then saw cut it the next day

@MrKistel 2 жыл бұрын

Seems like the saw cut concrete joints are the cleaner way to go

@JH-qw2jx 4 жыл бұрын

But, when it does crack it will be visible. The normal method hides the crack

@MrKistel 4 жыл бұрын

Thank you for the comment, I assumed the structures were deep enough in the concrete that they would likely not be seen even if there was a crack. Will see what happens over time, so far so good.

@alanzubia5456 3 жыл бұрын

I do concrete for a living that idea doesn't work no need to put a piece of wood in the concrete because it'll rotten and be even weaker, that's why you have your hand jointer give it one pass to open it and then a second when its hard enough for that one last pass

@MrKistel 3 жыл бұрын

Thanks for the concrete installation tip. The inserts seem to be working well for this concrete patio,

@arevalocobra Жыл бұрын

Sorry bud this video on concrete was not your fortay

@justinopsincs8695 3 жыл бұрын

Not a good idea. You are separating each piece concrete, making the entire structure weaker. Sure you control the cracks, on a tiny piece of sidewalk, but now you created an opportunity for shifting and settling because it’s no longer one piece. Would not recommend

@MrKistel 3 жыл бұрын

In this application, I actually preferred the overall concrete patio to be broken up into sections. If for some reason if one concrete section is stressed in the future from something like a growing tree root or elevation change the surrounding concrete sections will not be impacted.

@Slouworker 2 жыл бұрын

You must have never worked with concrete eh

@Famekom 3 жыл бұрын

Respectfully thats a cheap groover. 304 or 305 kraft groover will make it crack. That toy groover u have is trash. Respectfully..

@MrKistel 3 жыл бұрын

Thanks for the concrete tool tip. Looks like the concrete control joints shown in the video are performing well. I have noticed there is a crack along one of the grove lines thus far.

@devinedorn7064 2 жыл бұрын

Haha he has no experience clearly the concrete has already set that is why you had to stamp the tool into it. You should be able to drag it like a edger….🤦‍♂️