Concrete Underpinning in Savannah, GA

Concrete underpinning strengthens and extends an existing foundation downward to reach stable, load-bearing soil. When Savannah’s shallow, moisture-sensitive soils can no longer carry a foundation, underpinning transfers the load to deeper, dependable ground.

Why Underpinning Is Needed on Coastal Soils

Foundations built on shallow footings settle when the supporting soil shrinks, washes out, or was poorly compacted. Underpinning deepens the foundation so it bears on soil that stays stable through wet and dry cycles.

What Concrete Underpinning Includes

• Engineering assessment of loads and soil conditions
• Sequential excavation beneath the footing
• Poured concrete piers or mass underpinning to stable strata
• Load transfer to the new deeper support
• Integration with piers where access or depth requires

Signs You May Need Underpinning

• Ongoing or worsening foundation settlement
• Wide, active cracks in foundation walls
• Additions pulling away from the main structure
• Plans to add load (a second story) to an older foundation

What Concrete Underpinning Does for Savannah Foundations

Underpinning is the process of strengthening and deepening an existing
foundation that has settled, so its load transfers down to firmer, more stable
soil. When the ground beneath your original footings loses its bearing
capacity, the structure sinks unevenly — and no amount of patching
cracks fixes the cause. Underpinning reaches below the failing layer to
reestablish support. At Solid Foundation Repair Of Savannah, we have installed
underpinning across Chatham County and the coastal Georgia Lowcountry since
1989 to stabilize homes and commercial buildings that shallow footings can no
longer hold.

Underpinning is typically the right solution in three situations:

• Settlement: footings have dropped because the supporting
  soil eroded, washed out, or lost strength, leaving voids beneath the
  foundation.
• Added loads: a second story, heavy addition, or renovation
  places more weight on a foundation the original builder never sized for it.
• Weak or shifting soils: the structure sits on loose fill,
  sandy layers, or ground with a bearing capacity too low for the building
  above.

Why Coastal Savannah Soils Cause Foundations to Settle

Savannah sits on the Georgia coastal plain, where the soil profile is a mix of
fine sands, silts, and clays over a shallow, tidally influenced water table.
That combination drives most of the settlement we see across the region:

• Sandy, erodible soils: our silty sands shift and wash out
  easily. When water moves beneath a slab or footing, it carries fines away
  and creates voids the foundation eventually drops into.
• High water table: in low-lying Savannah, the water table is
  often just a few feet down and rises and falls with tides and heavy
  rainfall. Fluctuating groundwater reduces soil bearing capacity and
  undermines shallow footings.
• Poor compaction and fill: newer developments on the
  outskirts frequently sit on graded fill that keeps compacting for years
  after construction, producing the uneven settling homeowners notice later.
• Drainage and grading: poor gutter runoff and improper
  grading concentrate water at the foundation edge, accelerating washout under
  the footing.

Because Savannah’s ground is so wet and variable, going deeper the right way
— not just wider — is what actually solves settlement here.

Underpinning Methods We Use in Coastal Georgia

There is no single approach that fits every home. We match the method to your
soil, foundation depth, and load conditions:

• Mass concrete (pit method): the traditional technique. We
  excavate small pits beneath the footing in a staggered sequence, dig down to
  firmer stratum, then pour concrete to build a deeper mass under the existing
  foundation. It is cost-effective and well suited to shallower underpinning
  where a competent bearing layer is within reach.
• Pier & beam underpinning: reinforced concrete beams
  span between new piers, transferring the structure’s load to those deeper
  supports. This is preferred where mass concrete alone cannot reliably reach
  stable soil, and it is common on crawl-space homes throughout the
  Lowcountry.
• Helical pier underpinning: steel shafts with helical plates
  are screwed down with hydraulic torque motors until they hit load-bearing
  soil. Extensions are added as needed, then a bracket transfers the
  building’s weight to the pier — ideal where sandy layers run deep.
• Push (resistance) pier underpinning: steel tubes are
  hydraulically driven using the structure’s own weight until they reach dense
  soil or bedrock, delivering deep, high-capacity support for heavier loads.

Because Savannah’s water table sits high, pier methods are often the
dependable choice when firm soil lies well below the surface. These techniques
integrate directly with our broader
foundation repair work
when settlement has also caused cracking or sticking doors.

Our Concrete Underpinning Process

Every Savannah underpinning project follows a disciplined, engineered sequence
so the fix lasts:

• Inspection and diagnosis: we measure the settlement,
  identify the failing soil layer, and confirm underpinning is the correct
  remedy rather than a surface repair.
• Method selection: we choose mass concrete, pier & beam,
  or helical/push piers based on your foundation and coastal soil conditions.
• Staged installation: pits or piers are installed in a
  planned, staggered order so the structure stays supported throughout the
  work.
• Load transfer: piers are advanced to firm bearing soil, or
  concrete is cured, then the load is transferred to the new deeper support
  — often allowing controlled lift back toward level.
• Verification and cleanup: we confirm stabilization,
  backfill, and restore the site.

Talk to Solid Foundation Repair Of Savannah

If doors are sticking, cracks are widening, or floors slope in your Savannah
or coastal Georgia home, the foundation may be settling into weak soil —
and underpinning may be what stops it for good. As a family-owned, licensed
and insured contractor serving Savannah since 1989, we diagnose the real cause
before recommending any method. Request your
free estimate or call
(912) 642-3890 to have your foundation
evaluated.