The patio that leans toward the house is the one to worry about
Half the patios we look at in Denver aren't just low, they're tipped, and the direction matters. A slab pitched away from the house sheds water into the yard and mostly annoys you. A slab pitched toward the house delivers every storm and every snowmelt straight to your foundation wall. On the clay this city sits on, that's how a modest patio repair heads off a five-figure foundation bill.
The tilt starts underneath. Denver Formation clay shrinks hard in dry years, and the soil under a patio's outer edge, the part that bakes in full sun, dries out faster than the shaded soil near the house. Support goes uneven, the slab rocks, and gravity picks a direction.
March and April are patio-wrecking months here
Denver's heaviest snows come late. The wet spring storms load a patio with hundreds of pounds of dense snow, then melt fast and soak the slab perimeter for days. A patio that came through January flat can come out of April with a sunken corner, because the melt found a pocket that last summer's drought opened and washed it bigger. Add the June-through-August hail storms that turn a backyard into a shallow pond in minutes, and the soil under a Denver patio never really gets an off-season.
We lift year-round anyway. The slurry cures in cold weather, so a patio that drops in November doesn't have to wait for June.
Small backyards, old trees, and a hose that fits through the gate
A lot of Denver patios sit behind bungalows on narrow lots, through a gate a wheelbarrow barely clears. That wrecks the logistics of replacement: hauling demolition rubble out and getting new concrete in makes tear-outs expensive in the city core. Our truck stays in the alley or on the street, and only the hose comes through the gate. Mature trees stay untouched, garden beds stay planted, the fence stays up.
Age is the other Denver wrinkle. Behind the postwar ranches we find original patios pushing sixty years old, and behind new infill we find slabs settling before their first birthday because the builder's backfill is still compacting. Both lift the same way:
- We drill 1-1/2" holes through the settled section, tucked into pattern lines when the finish allows.
- The pump pushes water and sandy loam soil slurry underneath until the slab sits back at its original grade.
- Holes get patched flush. Stamped and colored finishes keep their surface, because all the work happens from below.
One visit for most patios, and Trevor will tell you when dinner can move back outside.
The mix is worth trusting: once cured, the slurry is a dense, stable fill, so a lifted patio has little reason to move again. Hail can chew a slab's surface, and freeze-thaw can work its joints, but the base we pump doesn't wash away, and the base is what failed in the first place.
The Denver number, and when we won't take the job
A patio lift lands around a fraction of replacement cost, quoted free and in person. Where you land depends on the drop and the void volume, and Trevor measures both during the free estimate, in person, with a written number before he leaves. What he won't do is quote a lift on a patio that's broken into many small pieces. Small fragments rise unevenly and that repair fails on a schedule, so we say replace it and walk away from the sale. Thirty-plus years in this metro says that's the answer worth giving.
He'll also point at your downspout. It's usually part of why the corner sank, and a cheap extension is what helps our repair last.
Get it looked at before the next wet snow
If the patio pooled water last spring, it'll pool deeper this one, and the sunken corner only travels in one direction. The estimate is free and quick. Browse finished lifts on our work page, then call (303) 526-2222 or book the estimate online and we'll get Trevor out.