Repair deteriorating or spalling concrete with stucco (2023)


Repair deteriorating or spalling concrete with stucco.

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Kirk and Jason Giordano Plastering Inc.

Hello, all interested in my personal opinion on why this happened. No, I'm not an engineer.
Far from it, I'm simply a stucco applicator/contractor.
However, I understand enough about plastering and stucco, as do most engineers, regarding the do's, don'ts, whys, and hows.

Say, for example, this building is over 100 years old. I can see that a high ratio of Portland cement plaster was used with very little lime, so when strong movement occurs as it's normal.

With years of rain, this building will lift a hair and then settle, windows and doors slamming, and wind and natural ground movement also create regular vibrations.
This will cause cracking, now when rainwater penetrates and then freezes.
This action, known as spalling or water expanding, pops off chunks of concrete, exposing rebar, which will, in turn, rust quickly.
Thus the act of deterioration begins.

If they had added extra lime, this building might not be in this condition? Lime flexes more, but the pros don't overpower the cons. Set time.
There are reasons that the structures from the Greek and Roman ages still stand today after sometimes more than 5,000 years ago they were built.

Building with a lime-based binder lasts forever instead, of a cement-based binder or glue used in stucco and concrete.
As lime takes a long time to set, we live and have always lived in a world where speed dominates.
This typical spalling in this video is no one's fault. I'm just reading between the lines.
Lastly, although I informed my educated opinion about why this spalling happened to the owner, he decided how to repair it.
To repair deteriorating concrete, one should understand why it deteriorates.

Special tip only from the minds of this DIY network designed to teach young and old, the inexperienced, to master modern craftsman alternatives and/or traditional methods used in applying our goals of spreading any interior or exterior plaster.
The original Home improvement or DIY network of plastering and stucco videos.
Thus whatchawannano about stucco or plastering? Kirk's website and contact information. Jason's Website.

Thank you all for watching, and wishing all a great day!


Hello, folks, kirk, and Jason are here with kirk giordano plastering.

Today was n going to repair this deteriorating concrete wall., I.

Guess, in order n to repair a concrete wall, that's deteriorating.

You've got to know a little bit about why the concrete deteriorates the wall.

There are many reasons why concrete material the carbon dioxide in the air can deteriorate concrete, rebar too close to the surface can get wet because it's porous and corrodes.

Then helps deteriorate concrete.

The fluoride in the water can deteriorate like this actually is a little bit more than the three I've mentioned, of course, I'm not here to explain why concrete deteriorates.

I've just given you an idea.

If you want to really know, why, Google it, they can answer it.

A hundred times I looked at this right here and I figured just from looking at it.

It was about 110 years old and I also can see by looking at it closely that fellas about 30 years ago did stucco.

They did just what we're going to do.

But some of it came off.

So I advised the fella who only put pressure washer with 3000 psi, which he did, they did a really nice job.

Josh Jason will show it to you soon.

They did a great job.

And they took off a lot of it.

However, I came in I tapped it with a hammer, and there's still a lot.

That's gotta come off.

So the fella that owns this says, I don't want to destroy the integrity of it or rebuild it.

So I'm going to tap off a little bit more I'll show you how we repair it, also too, concrete it very similar to stucco.

They are both made with Portland.

Cement aggregate, water, stucco.

We add sand as the aggregate, in concrete.

Its rocks, can be quarter-inch, half-inch, that's that's, the only difference.

anyhow, but we're prepared to do today is pound off or knock-off gently any of this stuff and then we're going to pressure wash, the loose stuff that I have to get all this out otherwise our new work blown in here.

So we're going to pound off some of the loose stuff pressure wash that to remove all this and we're going to hit it with weld creat, I'm, probably going to come back tomorrow and do the actual cement fix to this and I'll freehand, everything we're going to beat up some of these corners and try to salvage everything that we can we're gonna get set up guys and working pretty high up on it wall here.

So I'll have a harness with my scared self, looking down here, it's., big, drop, Anyhow.

When we get to that stage we'll show it to you.

we're going to get to the fun stage now.

We try to remove the loose stuff and here's where it takes a little bit of practice in order to get the loose stuff.

You could go by sound basic.

this right here, that's lose this iffie, that's solid.

So it is loose like this.

Best thing is to take a claw and pull it out of here.

This does take a long time.

Well, it says, again, I don't want to remove the whole thing we don't either.

But we have to reduce them tell us who did the last work I, give them out 30 years in class.

So we want to do as well or not better like areas like this solid, solid, solid I can see a buckle here, Move back, and that's how we determine this area inside here, solid, moose.

You can hear the difference.


You folks can hear the difference, so anyway, after we remove all this now, I'm going to crush your wash.

Just once more.

He did a great job with 3000 psi.

But I want to hit on let's get all this loose stuff off.

Then we apply the bonding agent, which I'm gonna double up., All, right, guys.

We got that nasty worked out of all the breakout.


One color is the absolute worst I'm talking about earlier with an aggregate like a dinosaur.

These rocks in this concrete, right here would point out that rebar close to the surface corrode.

A deteriorating business.

This is right on the surface.

We had a few other things, here., Still, its nothing that we can't handle .

Anyhow, Jason, viola, anyhow., I.

Am going to clean up this mess, then you will pressure wash it to get all the dust off of this; unfortunately.

Come on top of this roof, here.

We can just relax and reach over.


How I was able to get down.

I'm, not on the ladder.

Just reach it down comfortably.

that way.

We get good here.


We've got super-rich mud, plus we have accelerators.

I will stop down six inches in some spots and I am going to complete I could take it to throw it in there, like that I'll be doing the whole all the heavy 6-inches patches, just like this I wanted to set immediately now where I can keep moving we're gonna give the hot Sun, so we're hustling now, but actually, the ability to get in this corner.

Okay, I get it I generally, put some on here.

This is a really hot mug.

So I got to get rid of it in five minutes.

So I'm going to put some bulk here, Oh a little bulk out of time.

Guys a little bit.

Take it.

Sure how I get my take it here working a hot sun, too.

So it makes a difference for when this sets.

Alright, okay for Darby now, be doing a lot of leather.

Do this I'll put it about right here? Squeeze it down the line.

These corners up I'll.

Take this guy here, pull it straight up, just like that., Anybody order, a pizza? Give that guy a tip.

We're going to take lunch, and afterward, we'll come back and show you the completion of this.

Alright, guys.

Now that I got this one portion here, sponge, fluid, everything a lot of water.

Now to give me the stucco finish that they originally have anyhow, I hope, you learned something about deteriorated concrete and how to repair my name's Kirk I.

Am with Kirk giordano plastering.


Thank you for watching and as usual, guys, we'll, see on the next one.


Will spalling concrete get worse? ›

If you ignore spalling, it eventually spreads, compromising the integrity of the surface until it is beyond repair, leaving you no recourse but to rip it out and start over. If you tackle a spalling problem early on, it's easy to remedy.

What is the difference between spalling and scaling? ›

Spalling is similar to scaling, except the expansion occurs from deeper within the concrete, causing the surface to disintegrate into larger fragments. Common causes are rebar corrosion due to carbonation, intense heat that causes water vapor to expand violently, improperly constructed joints, and crack deterioration.

What is the best patch for spalling concrete? ›

For larger areas of pitting and spalling, we recommend using a 100% epoxy concrete patch with a sand aggregate.

Can you cover crumbling concrete? ›

Covering Crumbling Concrete With Pavers

Pavers are a good choice for covering up a crumbling concrete slab because they are durable and can withstand foot traffic and the changing weather. In addition, pavers come in different colors and sizes, so you can choose the ones that will best match your patio's design.

How do you harden crumbling concrete? ›

You can use packaged masonry or concrete repair mixes, available at home improvement stores, or buy a bottle of concrete bonding agent and a bag of mortar. Brush the bonding agent onto the old concrete and let it sit until tacky.

How do you bond concrete to old concrete? ›

Chemical bonding: The chemical approach involves mixing up a liquid bonding agent that helps bond new concrete products to old. Make sure to use concrete products that are compatible with a liquid bonding agent.

What happens when concrete deteriorates? ›

If the pressure exceeds the tensile strength of the concrete, the cavity will dilate and rupture. The accumulative effect of successive freeze-thaw cycles and disruption of paste and aggregate can eventually cause significant expansion and cracking, scaling, and crumbling of the concrete (Fig.

Can you resurface spalling concrete? ›

You can repair and resurface your spalled concrete in any number of ways. You can buy products that apply a very thin coating on the concrete.

Will sealing stop spalling? ›

Coating concrete with a waterproof seal about a month after concrete placement can help prevent water-caused spalling. Other areas of concrete installation that might cause spalling involve hard-troweling the exterior of the concrete slab while water was still escaping.

Can spalling concrete be sealed? ›

Water repellent sealers are a great solution to concrete spalling because they cause water and other liquids to bead off the surface. They reduce the absorption of water by up to 95%, preventing water from being able to freeze within the pores.

How serious is spalling? ›

Spalling is caused by water that's released from inside the brick or cement, where the base gets pushed out. It can look like crumbling or flaking, especially around walls and floors. This is a serious issue and can mean that the integrity of your structure is compromised. In fact, the whole building could collapse.

How do you get rid of spalling? ›

Get rid of concrete spalling by resurfacing the concrete

Resurfacing your driveway, patio or basement floor with a 1/2-in. concrete overlay fixes the problem. Enlist a couple of helpers and overlay the concrete surface one section at a time.

What does spalling concrete look like? ›

Spalling looks like pitted acne scarring and breaks off in flecks which can expose rebar. These divots vary in diameter and depth but can be thicker than 5 inches and just under an inch in depth.

How do you cover pitted concrete? ›

Polymer-modified cement patches are ideal for repairing pits on garage floors because they're easy to apply and provide a seamless finish. Deeply pitted or spalled concrete should be patched with a cementitious patching material, such as epoxy or polyurea.

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