Two generations of Westminster garages, one shared problem
Garage slabs in Westminster fail on two different clocks. In the 1960s through 80s subdivisions on the south side, the floor was poured over builder backfill that was never compacted to modern standards, and after several decades that fill has finished sinking into place. The slab cracks down the middle, one side drops, and the crack widens a little more every winter. Up toward 144th, in the newer builds, the story is the same but younger: fresh backfill around a recent foundation keeps settling for years after closing, and the garage floor is often where a homeowner first sees it.
Different decades, same physics. The ground under the slab compressed or washed away, the concrete held its shape as long as it could, then it followed the ground down.
Why the apron edge is the weak point here
Westminster weather works on garages from the doorway in. Fast spring melts send water sheeting across the driveway and against the apron, where it slips beneath the garage slab edge and carries base soil out with it. Add the open-lot wind that bakes the clay dry every summer, and the front few feet of a garage floor here live through sharper wet-dry swings than almost any other slab on the property. It's why so many of our Westminster garage calls start with the words "it's sinking near the door."
The lift, and the tolerances we hold
We raise settled garage floors without removing the slab and without a jackhammer in the building. The crew drills 1-1/2" holes through the low areas, pumps slurry underneath, and brings the floor up, checking the span as it rises. Garage floors get brought carefully back to level, because you'll park on this surface, roll jacks across it, and maybe coat it later. If there's a long crack, we can usually bring both sides back flush with each other so it stops catching wheels and shoes.
Slabs up to 12" low are still liftable. Past that, the connection at the foundation wall becomes the real question, and we'll recommend replacement instead of pretending otherwise.
The numbers
- Priced by slab area and how far the floor has to come up, quoted free and in person.
- A short wait for the car. Trevor will tell you at the estimate when it can come back in.
- An honest verdict. If the slab isn't a good candidate for lifting, we say so instead of taking the job.
- Replacement, for comparison, means breaking out a floor inside a finished structure, hauling rubble across your driveway, re-pouring, and losing the garage for a week of cure time.
One request from our side: clear the slab before the crew arrives. If everything can't leave, push it to one side and we'll lift in two passes.
Season doesn't factor in much on this one. The slab sits under a roof, the slurry cures fine in cold weather, and a February garage lift goes the same as a June one. If the driveway is buried in a foot of snow the day of the job we may shift a day, and that's about the extent of it.
Planning an epoxy floor? Sequence matters.
A good number of our Westminster garage calls come from people about to coat the floor, and the order of operations decides whether they're happy in five years. Lift first, coat second. Coatings follow the slab exactly, so an out-of-level floor stays out of level under the shiniest epoxy in town, and every dropped bolt still rolls to the same corner. Once our patches cure they take coating like the rest of the slab. We walk through the repair itself in how to fix low spots on a garage floor.
A quick self-check before you call
Lay a straightedge across the crack and see how far the low side sits below the high side. Then knock on the slab every few feet with something hard. A dull thud means the concrete is still bedded on soil. A hollow ring means there's a gap under there, and a gap under a garage floor in this clay is a countdown, not a curiosity. Either finding is worth a free look from Trevor, who quotes every Westminster job in person and in writing. More on the service is at our garage floor leveling page, or call (303) 526-2222 and tell us what the floor is doing.