Discover How Concrete Overlays Refresh Worn Floors Without Replacement

A worn concrete floor doesn’t always need to be torn out to look brand new. We talk through the real-world option that often gets misunderstood: the concrete overlay. If you’ve heard terms like “overlay” or “micro-topping” and assumed it’s just another coating, we clear that up fast and explain what it is in plain language a homeowner can use. We also share what an overlay is made of, how it’s mixed with an acrylic modifier, how thin it really is, and why that detail matters for performance and final look.

Then we get practical about decision-making. The big question isn’t “Can I put an overlay here?” but “Should I?” We dig into substrate requirements, especially moisture vapor transmission through the slab and how it can lead to delamination, peeling, and chunking. We also explain why outdoor concrete tends to be where failures show up first, and why an old overlay can be surprisingly hard to identify once edges are hidden by landscaping or the surface resembles standard concrete.

Finally, we cover where overlays deliver the most value: basements and commercial spaces with a patchwork history of tile, carpet, laminate, and adhesives. When removed floors leave permanent grid lines and visual scars that grinding can’t erase, an overlay can create a consistent canvas for a stained and sealed concrete look that’s durable and clean. If you’re planning concrete resurfacing, decorative concrete, or a stained concrete floor upgrade across Colorado’s Front Range, this conversation will help you avoid expensive mistakes. Subscribe for more straight answers, share this with a friend considering a floor redo, and leave a review telling us what space you want to transform next.

To learn more about Mile High Coatings visit:
https://www.MileHighCoatings.com
Mile High Coatings
970-314-1023 

Transcript

SPEAKER_00 0:03

Welcome to the Mile High Coatings Podcast, where we elevate your spaces to a new peak in quality. Hosted by David Naniga, president of Mile High Coatings, this podcast explores how expert residential painting, concrete coatings, and epoxy flooring can transform garages, basements, patios, and commercial spaces across Colorado's front range. So grab your favorite beverage, sit back, and dive into the world of high-quality coatings.

SPEAKER_01 0:35

Overlays can transform worn concrete without the cost of full replacement if the conditions are right. Welcome back everyone. I'm Julie Schwenzer here again with David Nanaga, the president of Mile High Coatings. David, thanks again for joining us.

SPEAKER_04 0:50

Absolutely. How are you doing?

SPEAKER_01 0:52

I'm okay, and I'm excited to hear from you about this question in particular because we love when you teach us. Um we're diving into a foundational topic. Can you explain what are overlays and what kind of uh projects are best suited for them?

SPEAKER_04 1:08

Sure. Yeah, so overlays, um it's interesting. Overlays can get maybe a little bit misunderstood or misconstrued by some people. Um, you know, some people might you know see another coating that we do, let's call it, let's just say like a quartz coating, um, and they they sort of switch that in their head and they call it an overlay.

SPEAKER_02 1:37

So it's it's basic, it's completely different, really.

SPEAKER_04 1:43

Um so an overlay is is essentially, at least in my world, considered like a thin layer of a cementitious product that's overlaid, that's coated, sweetied, uh applied, whatever you want to call it, over a substrate. It could be a an LSB plywood type of sub substrate, like a subfloor.

SPEAKER_02 2:14

Um, sometimes you see those on like a raised balcony. Um could be over concrete, you know, certainly.

SPEAKER_04 2:24

Uh could be uh over like old VCC tile. Uh sometimes you you can occasionally get that over where might be asbestos tiles and you don't want to disturb that, or or the the the business owner or homeowner doesn't want to um you know bear the cost of of dealing with the the the asbestos mitigation. And so so you can go over the top of that with with an overlay. And um, and so then that way you're not disturbing it and it's and you're just sort of encapsulating it and it's all good. So so an overlay is basically just like a solid cover. You know, it's the the idea is it's supposed to act like and be like cement, but it's not just it, it's not concrete, it's it's cementitious. So it so like the product comes in, you know, like a 50-pound bag, like it looks like a big old bag of cement, right? And then you've got um, it's called a modifier. And most modifiers are um they're they're acrylic, uh, typically. And so so it's considered an an acrylic modified cement. And so you mix this bucket of liquid, kind of looks like glue, sort of. Um, mix it in, um, and then you you get the you know, get you get the mixture, the mixer, it's it's kind of flowy. It's you know, you and you pour it out and spread it around, and then that's your that's your overlay. Typically you do a couple, couple layers, couple coats, whatever you want to call it. And um, and then from there it can be coated, it can be stained. Um, you know, there's sort of different different treatments you can you can uh do you know once the overlay is down. And so so it um you know it can again, it can cover, you know, a variety of different substrates. Beat up concrete is one of them.

SPEAKER_02 4:08

Um and yeah, so often we do them. Seems like we do them more indoors, I I think more than anything.

SPEAKER_04 4:20

Um and we do like a stained application. So it looks so you know it could be an application where the the homeowner wants to their maybe their main level instead of you know um hardwood or or whatever, you know, laminate for whatever uh carpet. You know, they they want like a stained concrete look, and so we can do that overlay and apply it and stain it and seal it.

SPEAKER_01 4:46

So prior to this episode between sessions, you were talking about micro-toppings. Um can you explain what that is?

SPEAKER_04 4:55

Yeah, so a micro-topping is really just another term for an overlay, and and it's kind of referred to because sometimes people think that an overlay, you know, they think of concrete, they think of a big thick slab, you know, a four-inch slab. And and really we're we're talking about a very thin layer of uh of the overlay, of the cementitis overlay that gets applied. And so we're not talking about, you know, applying, you know, an inch thick or even a half an inch thick. It's it's pretty thin. I mean, it's maybe like an eighth to maybe no more than probably a quarter of an inch thick, depending on what we're doing in the application. So micro-topping is really just another word or term for for an overlay. And uh, yeah, so that's really there's that's the difference.

SPEAKER_01 5:46

And going back to you touched on concrete, what conditions must a concrete surface meet before you can apply an overlay, or it's even considered an option.

SPEAKER_04 5:57

Yeah, so you don't want to have a lot of moisture coming through the slab, and there's moisture tests that can be done uh to uh to to measure uh vapor transmission, which is water vapor coming through the porous slab, uh, because you don't want to have uh potential delamination, which I do see that a lot. Uh I see that a lot more uh seems like on outdoor concrete. I've seen it on driveways where um you know people, you know, like some some contractor didn't did an overlay or maybe on a porch too, and and it starts chunking off, peeling off, kind of just um and and once that happens, once it starts peeling and failing, it looks looks pretty bad. And so um, so we we we've we've had to deal with that uh um a number of times on outdoor concrete. Uh and and sometimes you don't even always catch it uh right away because because there there are some some telltale signs, but sometimes they're not they're not uh they're not obvious. So usually when an overlay is done along the along the edges of a slab, so think like a sidewalk that has kind of clearly defined edges, and you know, you apply that on the top, and then you know the material kind of sloths over the edge and and kind of build up if that's covered up by molts or or or just other landscaping grass, whatever, um it the top layer looks pretty much like concrete. And so it's not it's not obvious. And a lot of times the homeowner may not even know or remember or realize that that it's uh there's an overlay over that. And so so I guess back to your question, um, you know, we want the ultimately we want the substrate to be sound with with anything we do, because you know, the overlay isn't just you know magic in a bag. You know, it's not gonna, you know, if your substrate is really in poor shape, there's a lot of aggregate exposure, and it's like kind of crumbly, um, may not be a good idea to put an overlay on it. And I've seen sometimes people will will talk customers into that because they think that that will solve the problem. It may solve it in the very short term, but eventually it's it's gonna be gonna kind of turn into a bad idea and a waste of money.

Best Spaces For Overlays

SPEAKER_01 8:20

So and what types of spaces have you seen benefit the most from overlays, like garages or patios or basements or even commercial spaces?

SPEAKER_03 8:31

Um so typically basements and and commercial spaces.

SPEAKER_04 8:37

So so sometimes, well, I guess either in in basements and commercial spaces, you can get a hodgepodge of, you know, you might have a little bit of tile um maybe in one area. Maybe if it if it's um a like a like a walkout basement, you know, right when you walk in the door, you know, you might have like a little kind of entry area of tile that maybe turns into laminate or carpet, and then maybe, maybe there's like an entertaining area, like a bar, and there's a you know, tile behind there or some other type of floor. And so what happens is you get this sort of mixture of of existing floors. And so when that comes out, uh when that flooring gets removed, tile they can lead to square, like the grid lines that you see basically the grout, um you know, moisture, just contaminants, whatever it is, can kind of leave impression, kind of leave the lines behind, even if and you can't really grind them out. And so they're kind of permanent. And so if people so so say a customer wants a stain, a stained concrete application, they um, you know, and they don't want to see the you know, the grid lines because you know it may not be consistent, it may just be in like a little couple areas in the floor, and if they want consistent looking floor, then no, then an overlay would be a good application because we can we can cover that whole floor and then stain it and seal it, and you essentially have like a stained concrete application that's gonna be very durable. And and so similar type of situation in a commercial space. You know, a lot of times commercial spaces, you know, think of like retail stores. There's you have all kinds of floor, flooring designs and whatever you want to call it. There's a there can be a lot going on. And so that's another, you know, similar type of um reason, I guess, is you know, why or where um where uh overlay might make sense.

SPEAKER_01 10:31

Okay. Well, David, thanks again for helping homeowners homeowners understand when overlays make sense and when they do not. We always appreciate your advice.

SPEAKER_04 10:40

Absolutely. Thanks.

SPEAKER_00 10:45

Thanks for tuning in to the Mile High Coatings Podcast. Ready to give your space a fresh, durable finish? Visit MileHighCodings.com for a free price quote or call 970-314-1023. At Mile High Coatings, we're not just painting walls, we're setting a new peak in quality. Until next time, keep your standards high and your coatings higher.