By Admin 
Polyjacking vs mudjacking contractor: which to choose for your pool deck
⏱️ 9 min read · Last updated: 2026
- Cost: mudjacking averages $3–$8 per square foot; polyjacking runs $5–$25 per square foot — a typical foam premium of 60–150% on pool deck jobs.
- Cure time: polyurethane foam reaches roughly 90% strength in about 15 minutes; mudjacking slurry needs 24–72 hours before the deck should carry full load.
- Weight added: mudjacking slurry weighs about 100 pounds per cubic foot; polyurethane foam weighs about 2 pounds per cubic foot.
- Lifespan: mudjacking typically lasts 5–10 years before re-settlement; polyjacking commonly lasts 30+ years.
- Injection holes: mudjacking needs 1.5–2 inch drilled holes; polyjacking needs 5/8-inch holes that patch almost invisibly — a real difference on stamped concrete.
The mudjacking crew quoted $2,100 and told the homeowner to stay off the deck for two days. The foam crew quoted $3,600 and had swimmers back on it by 4 p.m. the same day. Both quotes were for the same 300-square-foot sunken section beside a chlorinated pool.
That gap is the entire polyjacking vs mudjacking contractor decision — which to choose comes down to three things most comparison articles skip: how close the sunken slab sits to your concrete coping, how much weight your soil can take, and whether the deck lives in a splash zone.
Those three factors matter more than any line on the invoice. I’ve watched both methods performed on pool decks, and the deciding factor was never the price — it was what happened under the slab six months later. Here’s the honest version, starting with what actually separates the two methods.
The real difference between polyjacking and mudjacking
Before you can compare a polyjacking vs mudjacking contractor, you need to understand what each crew actually pumps under your slab: polyurethane foam injection (polyjacking) uses an expanding two-part foam, while mudjacking (slabjacking) uses a slurry of sand, cement, and soil. Everything else — cost, cure time, longevity, hole size — flows from that one distinction.
Start with the older method. Mudjacking is slurry slab lifting. The crew drills 1.5–2 inch holes through your deck and pumps a wet, heavy mixture underneath until hydraulic pressure raises the slab. According to PolyMagic (2026), that slurry weighs approximately 100 pounds per cubic foot.
The foam injection method works differently. A polyjacking crew drills 5/8-inch holes, injects liquid polyurethane, and the foam expands to fill voids and lift the slab. It weighs about 2 pounds per cubic foot — roughly 50 times lighter than slurry.
Mudjacking slurry adds about 100 pounds per cubic foot of new load to the soil under your pool deck; polyurethane foam adds about 2.
Why does that weight number matter more on a pool deck than on a driveway? Because pool decks usually sink for a soil reason — over-excavated backfill around the pool shell or expansive clay soil that shrinks in drought. Adding 100 pounds per cubic foot to soil that already failed is asking it to fail again, faster. That soil reality is exactly why the hiring question deserves its own answer.
Should I hire a polyjacking or mudjacking contractor for my pool deck?
With that weight difference in mind, the answer for most pool decks is a polyjacking contractor — specifically if the deck is within 6 feet of the waterline, sits on backfilled or expansive clay soil, or is stamped concrete. The foam’s light weight, small holes, and water resistance match pool conditions in a way slurry doesn’t.
Three pool-specific conditions separate the polyjacking vs mudjacking contractor choice at the pool from the same choice on a driveway, and each deserves a closer look.
Chlorine and splash exposure
Cured polyurethane foam is closed-cell and hydrophobic — chlorinated splash water can’t soak into it. Mudjacking slurry is porous. In a splash zone, repeated wet-dry cycles slowly wash fines out of the slurry, which is one reason mudjacked pool decks re-settle sooner than mudjacked driveways.
Slab thickness and texture
Water isn’t the only concern — the slab itself matters too. Is foam or mud better for a heavy stamped concrete pool deck? Foam, and it isn’t close. Stamped decks are usually only 4 inches thick with a decorative surface you can’t hide patches in. Per HD Foundation Repair (2026), mudjacking requires 1.5–2 inch drilled holes versus 5/8-inch holes for foam that patch almost invisibly. On a stamped ashlar pattern, a 2-inch patch reads like a scar; a 5/8-inch patch disappears into a grout line.
Downtime
Finally, there’s the question of how long your pool stays closed. The cure time comparison is stark. Foam reaches roughly 90% of its strength in about 15 minutes — the crew walks on it during the job. Mudjacking slurry needs 24–72 hours before the deck takes furniture and foot traffic. If you lift in June, that’s two to three days of a closed pool versus zero.
Which lifting method is better near a pool with coping?
Splash zones, slab texture, and downtime settle most of the debate, but the highest-stakes part of any polyjacking vs mudjacking contractor comparison is the edge where the deck meets the pool. Polyurethane foam injection (polyjacking) is better near concrete coping — the row of finished concrete capping the pool’s bond beam. Foam lifts in small, controlled stages at low injection pressure, so a skilled tech can raise a slab edge within a few inches of the coping without cracking it or shoving it toward the pool shell.
Mudjacking, by contrast, works on bulk hydraulic pressure. The slurry pushes the whole slab section at once, and near a rigid edge like concrete coping, that pressure has to go somewhere. I’ve seen the result: a hairline crack running the length of three coping stones after a mud lift, a $900 repair on top of the leveling bill.
Beyond pressure, there’s also the drilling problem. A 2-inch hole can’t be placed within about a foot of the slab edge without risking a breakout, so mudjacking crews inject far from the coping and hope the lift carries to the edge. It often doesn’t — you get a slab that’s level in the middle and still pitched at the waterline.
That’s why a coping proximity lift — raising the slab edge that dies into the coping — is precision work. Foam’s 5/8-inch holes can be drilled 4–6 inches from the joint, which puts the lift exactly where the settlement is.
Mudjacking (slabjacking): the specific situations where it still wins
So far the scorecard looks lopsided, but a fair polyjacking vs mudjacking contractor comparison has to give mud its due. Mudjacking (slabjacking) wins when the slab is thick, the soil is stable, the sunken section sits well back from the water, and the budget gap decides the job. It’s not obsolete — it’s just wrong for the splash zone.
Here’s the honest case for the mud crew:
- Price. Per Regional Waterproofing (2024), mudjacking costs an average of $3 to $8 per square foot, while polyjacking runs $5 to $25 per square foot. On a 500-square-foot outer deck, that gap can exceed $2,000.
- Large voids on stable soil. Slurry fills big cavities cheaply. If a broken pool return line washed soil out from under an outer deck section and the line has since been repaired, slurry is an economical way to fill that void.
- Thick, plain slabs. A 5–6 inch broom-finished slab 15 feet from the pool tolerates the hole size and the pressure fine.
- Short ownership horizon. Selling within five years? Mudjacking typically lasts 5–10 years before re-settlement, per FoundationCosts (2026). You may never see the redo.
The trade-off you accept in exchange for that lower bill: weight and lifespan. On expansive clay soil — the shrink-swell clay common across Texas, Colorado, and the Midwest — that 100-pounds-per-cubic-foot slurry load compounds the seasonal soil movement that sank the pool deck in the first place, so expect a mudjacked deck on clay to land at the short end of that 5–10 year lifespan.
Polyjacking vs mudjacking contractor: the honest side-by-side
Put every factor from the sections above in one place, and the polyjacking vs mudjacking contractor scorecard reads like this: polyjacking wins six of the nine criteria that actually change a pool deck decision; mudjacking wins on price and large-void economics. The table below is the cure time comparison, weight math, and cost data side by side.
| Criteria | Polyjacking (foam) | Mudjacking (slurry) | Winner for pool decks |
|---|---|---|---|
| Cost per sq ft (2026) | $5–$25 | $3–$8 | Mudjacking |
| Cure time before use | ~15 minutes | 24–72 hours | Polyjacking |
| Weight added to soil | ~2 lb/cu ft | ~100 lb/cu ft | Polyjacking |
| Expected lifespan | 30+ years | 5–10 years | Polyjacking |