Centennial Foam Leveling

Last week of October, and our schedule changes character. Overnight lows drop through freezing, the ground carries a crust until mid-morning, and a lot of concrete work in Arapahoe County starts sliding toward spring. Wet slurry lifts are the first thing to go, because a cement mix sitting in a cold cavity under a slab never gains the strength it should.

Polyurethane doesn't care nearly as much. The material comes out of heated tanks, the two parts react with each other rather than with the weather, and the foam is carrying load about fifteen minutes after it goes in. So the injection rig stays busy from Southglenn to Foxridge into December, and the lip that showed up at your front step in September doesn't sit there catching toes until April.

What each stretch of the cold season allows

Why cold barely slows the material down

Two liquids meet at the gun and start a reaction that makes its own heat. That reaction is the reason the season stretches. The foam expands into whatever space it finds, presses outward against soil and slab both, then firms up while the crew is still watching the level. Fifteen minutes, give or take, and it's structural.

The other half of the argument is weight. Cured polyurethane runs a few pounds per cubic foot. Cement slurry runs about a hundred. On ground that's already proven it can't hold what's on it, adding a hundred pounds a cubic foot underneath is asking the same tired soil to do more work, and that's how a slab gets lifted twice. Foam fills the cavity and applies almost nothing new.

Ports are small too, a bit over half an inch, which is a real advantage on a colored or broom-finished surface where every patch shows. Small hole, quick plug, and the yard looks essentially the way it did when we pulled up.

Where foam is the wrong tool, and we'll say so

Foam is not the answer to every sunken slab, and we lose jobs saying it. A deep, wide washout under a large patio takes real volume to fill, and volume is where cement slurry is simply the better buy. Same with thick, heavy panels sitting over firm ground that can carry weight without argument. Nothing wrong with the old method on the jobs it fits.

Then there's the concrete itself. Neither method fixes broken. A panel cracked into several pieces comes up as several pieces, at a nicer elevation, still broken. Concrete that's spalling and dusting on top has a surface problem that lifting doesn't touch. We'll walk you through the replacement conversation instead of taking money for a repair that leaves you unhappy.

Last one: if the water that caused this is still arriving, fix the water. A cavity that formed because a downspout discharges eight inches from the slab edge will reopen. We fill the hole today and point at the gutter, and the honest answer is that both jobs have to happen.

The first winter on a slab we just raised

Snow removal is the question we get most in December. Shovel and plow it like any other concrete, with one caution: the plugs are mortar, and a steel edge dropped hard on one can pop it. Skid the blade instead of chopping, or lift across the patched line. If a plug does come out, it's a two-minute repair, not a failure of the lift.

Deicers matter more. Magnesium chloride is hard on concrete surfaces around here, and a slab that's already been through enough doesn't need it. Sand gives you traction without doing damage. And keep an eye on the joints after the first freeze cycle, because a raised panel means fresh joint sealant and fresh sealant is worth checking once.

Then in April, walk it again. Runoff is the great revealer, and the older walks around Walnut Hills give it plenty to reveal. If the panel we raised holds a puddle after melt, call us. If the water leaves the way it should, the lift did its job.