Slabjack

Slabjack

What is Slabjacking?

Slabjacking, also known as pressure grouting or concrete raising, is a cost effective process whereby concrete slabs are brought back their original height by having concrete grout mixture injected underneath them. Tennyson Foundation Repair’s mixture is natural Portland cement based slurry that is safe for our environment. Slabjacking  is a cheaper and quicker alternative to removing and replacing concrete slabs. Normally, slabjacking is used at small businesses, private homes, or wherever concrete settlement occurs.

 

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What causes concrete settlement?

Concrete slabs can experience settlement due to a variety of factors. Areas with poor drainage often contribute to soil erosion which can lead to concrete settlement. Also, concrete slabs built on filled-in earth can have settlement. This occurs frequently for homes with basement levels since the fill on the outside of the foundation often lacks proper compaction. In addition, sidewalk or patio slabs can pitch downwards which directs water towards the basement level.

 

BEFORE

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DURING

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AFTER

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What is the track record of slabjacking?

Slabjacking was officially introduced in 1929. However there are accounts of raising concrete slabs through the use of hydraulic pressure that date back to the early 20th century. Back then, contractors would use a mixture of local, easily-sourced soils (that occasionally included crushed limestone and/or cement) producing a “mud-like” substance. The Department of Transportation in Iowa was the first to use this “mud-like” substance commercially. They raised road slabs to the acceptable grade in a process that is now known as slabjacking. For 75 years, slabjacking has been used commercially on highways and parking lots and residentially on driveways and foundations.

How is slabjacking performed?

The slabjacking process is quite simple. Representatives from Tennyson Foundation Repair will come to your residence, drill several holes (that are generally two inches in diameter) in concrete slabs that have settled, and then inject a grout through the holes. The grout will fill in any underslab void space first. Once the void space is filled and the subsurface reestablished, subsequent injections will hydraulically lift the slab back to its original height in small controlled, increments. Slabjacking takes only a few hours and once the access holes are patched the work is complete. In many cases, the concrete slabs are ready for use the same day.

Where can slabjacking be used?

Slabjacking can be used on most concrete slabs that have settled from its original height. Tennyson Foundation Repair has expertise raising many different slabs using the slabjacking process. Here is a list of potential candidates for slabjacking:

  • Patios
  • Foundations
  • Porches
  • Outdoor steps
  • Garage floors
  • Sidewalks
  • Driveways
  • Swimming pool aprons
  • House floors

Why is slabjacking a good option?

Slabjacking is a slab repair technique for raising and stabilizing concrete slabs that have settled and so it is a good option to resolve uneven or sunken concrete that is unsafe and unsightly. Slabjacking is very cost-effective and can resolve any aesthetic or safety concerns the homeowner may have. Having level sidewalks, steps, or driveways will give the homeowner peace of mind as kids are playing or as the elderly come and go. There is also the extra advantage of keeping out rodents that burrow underneath concrete slabs. The voids created by animals or erosion or settlement act as a home for critters that can damage the home’s foundation.

Slabjacking has been a proven and efficient alternative to removing old and pouring new concrete at a fraction of the cost ever since slabjacking was first introduced in Mt. Pleasant, Iowa in 1929 by John Poulter. Here is a list of the benefits of slabjacking:

  • Clean and quick process
  • Works great for remote and difficult to access areas
  • Slabjacking leaves nearby landscaping unharmed and unaffected
  • The repaired concrete can be walked or driven on almost immediately.
  • Controlled lifting to desired grades
  • Slabjacking is dependable, cost, effective, and efficient
  • It stabilizes the sub-soil
  • Eliminates safety hazards, erosion, water penetration
  • Not affected by the weather

When can slabjacking be done?

At Tennyson Foundation Repair we gladly accept calls year-round to set a meeting date to assess the property’s needs. Our experienced professionals at Tennyson Foundation Repair understand the right mix of materials and equipment necessary in order to preserve the integrity of the concrete regardless of the weather.

Limitations of Slabjacking

Slabjacking is a slab repair technique for raising and stabilizing concrete slabs that have settled, but not as a load-supporting aspect of the structural repair. This is important when considering slabjacking. Also, poor quality concrete may crack when being raised; this is especially true for concrete slabs with a thickness less than four inches. Slabs built over filled-in land and/or poor subsoils can also experience further settlement.

What will my investment be if I choose slabjacking?

Tennyson Foundation Repair’s average slabjacking job costs about 30% to 50% of the cost of removing and replacing old concrete (also known as “rip and replace”). So, the homeowner saves considerable out-of-pocket cost in addition to being able to use the concrete slabs almost immediately after repair. However, each job does vary in cost, so we advise you to call Tennyson Foundation Repair for a specific job estimate.

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