When is concrete too far gone to lift?

When it's broken into many small pieces, when it has heaved up instead of sinking, or when the surface is crumbling badly enough that you'd want new concrete anyway. Otherwise, lifting is usually the better value.

How cracked is too cracked to lift?

A slab with a crack or two, cracked into a few large pieces, can be lifted piece by piece and sealed. A slab shattered into many small pieces can't be raised as one surface and should be replaced.

Is lifting concrete worth it if I'm selling my house?

Often, yes. Uneven walks, trip hazards and a patio pitched toward the house are easy things for a buyer's inspector to flag. Lifting fixes them in a few hours for much less than replacement.

How much does replacement cost compared to lifting?

Replacement includes demolition, hauling, base work, new concrete and finishing, so it typically costs several times more than lifting the same area. A lift is usually one short visit; replacement is several days.

Concrete Lifting vs. Replacement: How to Decide

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Can it be lifted? · 5 questions

What needs fixing?

Good candidates for lifting

Slabs in one piece or a few large pieces.
Sections that sank at a joint, a corner, the garage or the house.
Patios and walks that now drain toward the house.
Concrete that still looks good on top.

When replacement is the better call

The slab is broken into many small pieces.
Roots or frost pushed it up. Lifting only goes up.
The surface is badly scaled, spalled or crumbling and you'd replace it for looks anyway.
You're changing the layout, widening the driveway or adding steps.

Lift vs. replace, side by side

Fraction

of what tearing out and pouring new concrete costs

Same day

Walk on it when we pack up. Drive on it in hours, not a week.

No demo

No jackhammers, no dumpster, no torn-up lawn or landscaping.

5/8″ holes

Penny-sized and patched flush. No new slab that won't match.

Stays up

Foam adds almost no weight and doesn't wash out like soil.

Warranty

Written, and spelled out in your quote before you approve it.

	Lift with foam	Tear out and replace
Time	One visit, usually a few hours	Several days of work, then about a week before you can drive on it
Mess	5/8″ holes, patched	Jackhammers, dump trucks, forms, torn-up lawn edges
Weight added	Foam weighs 2–4 lb per cubic foot	New concrete weighs about 145 lb per cubic foot, on the same soil
Waste	Nothing hauled away	A 10×10 slab, 4″ thick, is about 2½ tons of broken concrete
Looks	Your concrete, back where it was	New concrete rarely matches the old slabs next to it
The cause	Foam fills the voids; we seal the joints	A new slab on the same washed-out base can settle the same way

Replacement timing is typical; a contractor's schedule and the weather can stretch it. New-concrete cure times from Concrete Network; foam and concrete weights from ArmorThane.

Replacing doesn't fix why it sank

Concrete sinks because the soil under it moved. A new slab poured on the same base, with the same open joints and the same downspout, tends to go the same way. Lifting fills the voids, and sealing the joints shuts off the water that made them.

Water washout

Roof and downspout water runs into open joints and carries fine soil out from under the slab. The slab drops into the hollow.

Fix: We seal the joints, and point out downspouts that need extending.

Freeze-thaw

Clay-heavy Green Bay soil holds water. Every winter it freezes, swells and thaws softer, loosening the base a little more each year.

Fix: Sealed joints keep water out of the base, which is what freezes.

Settling backfill

The soil pushed back against a new foundation is rarely compacted well. Anything sitting on it settles for years after the house is built.

Fix: Foam fills the voids and stiffens the zone under the slab without adding weight.

Thin or loose base

Some slabs were poured on a thin or poorly compacted base. Gaps under the slab let it settle at joints and corners.

Fix: Foam fills the gaps and supports the slab across its whole footprint.

Why lifting costs so much less

Replacement means demolition, hauling, forming, a new base, new concrete, finishing and days of curing, usually across several visits by a crew. Lifting is one visit, a small crew and a few hours, with no concrete to haul away or pour.

Selling soon? A level, sealed walk and driveway shows well and removes an easy inspection note for far less than new concrete.

Lift or Replace Your Concrete?