Half the garage floors we look at don't need replacing. Knowing which half is the whole job.
Most people who call about a garage floor haven't decided anything yet. They've decided they're annoyed. It's dusty, or there's a crack you can feel through a shoe, or a puddle parks by the door every February. Between that annoyance and a new slab sit three or four different choices that cost wildly different amounts.
Worth saying plainly: plenty of garage floors don't need replacing. Older houses in Northwest Englewood often sit on slabs poured thinner than anybody would pour today, over a base nobody wrote down, and a good number of them are still flat and sound. Meanwhile a newer-looking floor over in Broadway Estates can be the one riding on ground that shifted. Which failure you have decides whether you're buying a tube of joint filler or a week without a garage.
A slab that parks two sedans and holds a lawnmower is being asked for almost nothing. Cosmetic problems on that floor stay cosmetic. Grind it, coat it, live with it. But put a two-post lift on the same slab, or roll a loaded trailer across it twice a month, and it's suddenly being asked for something nobody built into it.
So the first conversation is about use, not appearance. We've told people their ugly floor is fine and told other people their clean floor has to come out.
| What the floor is doing | Five more winters of it | What waiting costs | Our call |
|---|---|---|---|
| Fine map cracking, surface still hard | Looks about the same, maybe a shade dustier | Nothing worth naming | Ride it out. Sweep it and stop thinking about it |
| Sheds gray dust no matter how often you clean | Film on the shelves, the toolbox, and everything stored in there | Moderate. Grinding and coating still works while the slab is sound | Handle it now. Wait long enough and a coating has nothing left to grip |
| A crack with a lip you feel through your shoe | The lip grows, water gets underneath, the two sides keep drifting apart | Real. It turns from a concrete job into a concrete job plus dirt work | Deal with it this year |
| A corner that dropped and holds water | Ponding becomes ice, the drop deepens, the wall base starts to suffer | High, and by then it isn't only about the floor | Replace it, and fix whatever let the ground move |
Open the door, take two photos from the back wall, and send them over. We'll tell you straight. (303) 569-4046.
Moisture first. The ground under a garage stays damp, and with no plastic between it and the concrete that moisture keeps coming up through the slab. It shows as a floor that sweats in spring, white crust at the back wall, or a coating letting go in sheets. Plastic costs almost nothing and cannot be added later.
Then fall toward the door. Cars bring snow in, it melts, and the water either leaves or sits against the wall until it evaporates. Dead flat means a permanent damp line at the back. A slight, steady pitch to the opening fixes it with no drain and no upkeep.
And joints. A garage is a rectangle with one opening, which sounds simple and isn't. The slab will crack; the layout decides whether that happens on a line you chose or somewhere across the middle. We break the floor into roughly square panels and run cuts out from the door corners, where the stress collects.
A one or two car garage moves quickly. Tear-out and haul-off take a day, base and forms another, and the pour is a morning. Walk on it in two days, drive on it in a week. What people underestimate is the emptying. Everything on that floor goes somewhere else first.
Timing is kinder here than on exterior work, since a roof means no rain landing on fresh concrete. Spring through fall is easy. Cold weather is workable in a garage tied to the house, because the space holds enough warmth to protect a blanketed pour. Detached and unheated in January is the hard case, and we'd sooner wait out the frost than pour over it.
Still unsure about something?
Call the crew at (303) 569-4046 and we will talk it through.
Get a free, no-obligation estimate from a crew that knows Colorado soil, Colorado weather, and how to finish concrete that lasts.
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