Pier & Beam and Crawlspace Foundation Repair in Marietta, GA
What is pier-and-beam foundation repair?
Pier-and-beam repair restores a raised foundation where the house sits on piers and wood girders above a crawlspace. It typically means releveling sunken piers, adding sister beams, shimming, replacing rotted joists, and controlling crawlspace moisture. Marietta Foundation Repair connects you with one vetted Cobb County contractor who diagnoses and corrects these issues.
Pier-and-beam (also called raised or crawlspace foundation) construction supports your home on a grid of masonry or concrete piers topped by wood girders, with floor joists spanning between them. Unlike a poured slab, this system has an accessible crawlspace underneath, which makes repairs more direct but also exposes the wood framing to moisture, rot, and pest damage over time.
Many 1990s subdivisions across East Cobb, Kennesaw, and Acworth were built with a basement-plus-crawlspace layout, and the crawlspace sections are where bouncy and sloping floors most often appear three decades later. Marietta Foundation Repair is a referral service, not a contractor: we connect you with one vetted, licensed, and insured local foundation repair partner who handles the actual diagnosis and work. Homeowners pay nothing for the connection or the inspection.
If your home is a brick ranch on a poured slab instead, see our slab foundation repair page, or review the full menu on foundation repair for how each system fails differently in Cobb's soil.
What are the signs of pier-and-beam foundation failure?
The clearest signs are floors that bounce, sag, or slope toward the center of a room, plus doors and windows that suddenly stick. You may also notice gaps at baseboard trim, cracked drywall over doorways, and a musty crawlspace. These point to settled piers, sagging girders, or moisture-weakened joists needing inspection.
Pier-and-beam homes telegraph problems through the floor system first. Watch for bouncy or springy floors, a noticeable slope when a marble rolls across the room, sticking doors and windows, drywall cracks over doorways, and gaps opening at baseboards or trim. Outside, a raised foundation can still show stair-step cracks in brick veneer or skirting.
In Cobb County these symptoms are usually driven by the same culprit: Piedmont red clay that swells and shrinks up to 6 to 8 percent in volume between the wet spring (March to May) and dry fall (August to October) - roughly twice the seasonal soil movement of most US regions. That movement shifts piers up and down, while a damp crawlspace softens the wood above them.
Don't ignore early basement seepage or standing water near crawlspace vents - persistent moisture is often the difference between a simple shim job and full girder replacement. Our foundation inspection page explains what the partner checks for during the free visit.
How do you fix bouncy or sloping floors over a crawlspace?
Bouncy or sloping crawlspace floors are corrected by releveling the structure. The contractor jacks the house back to level, then adds or replaces support: new piers or footings, steel shims on existing piers, and sister beams bolted alongside weakened girders. Rotted joists are reinforced or replaced so the floor regains stiffness and stops deflecting.
Releveling a pier-and-beam home is a methodical process. The local partner sets hydraulic jacks on stable footings, lifts the framing gradually back toward level, and then locks in new support so the correction holds. Common fixes include pouring new concrete footings, installing additional piers under undersupported spans, and adding galvanized steel shims to fine-tune height where a pier has settled.
Where a main beam has sagged or cracked, the contractor installs a sister beam - a new girder bolted directly alongside the original to share the load - rather than removing the existing member. Springy floors are often a sign joists are over-spanned or weakened, so sistering joists or adding intermediate support beams restores stiffness underfoot.
Gradual, monitored lifting matters: rushing the jacks can crack drywall, tile, and plumbing. A qualified Cobb County contractor releveling under IRC Section R401 residential foundation guidelines protects the rest of the house while correcting the floor.
What are sister beams, joist repair, and shimming?
Sister beams are new girders bolted beside a sagging or cracked original to carry the load. Joist repair reinforces or replaces floor joists weakened by rot or over-spanning. Shimming uses steel or treated plates to raise a settled pier back to the correct height. Together they relevel a crawlspace foundation without demolishing the framing.
Sister beams are the workhorse repair for raised foundations. When a primary girder cracks, twists, or sags, the contractor laminates a matching beam alongside it with through-bolts and adhesive, effectively doubling the support without tearing out the original member. The same approach applies to individual floor joists that have softened from crawlspace moisture or carried too long a span.
Shimming addresses height, not strength. As Piedmont clay shrinks in a dry Cobb fall, a pier can lose contact with the beam above it, leaving that section unsupported and bouncy. The partner inserts galvanized steel or treated shims between pier and girder to re-establish solid, level bearing. Done correctly, shimming is precise and durable; done wrong with scrap wood, it crushes and the problem returns.
Severe cases combine all three: replace rotted joists, sister the main beam, repour failing piers, and shim everything back to a level plane. Pricing for pier-and-beam work falls within the broader $3,500 to $25,000 foundation repair range depending on how many spans and piers are affected.
Why does my crawlspace stay wet, and how is moisture controlled?
Crawlspaces stay wet because Atlanta gets 50-plus inches of rain a year, and poor gutters or grading push that water under the house. Moisture is controlled with a sealed vapor barrier over the soil, improved drainage and grading, and sometimes a sump or dehumidifier. Dry soil protects the wood beams and joists above.
Metro Atlanta receives over 50 inches of rain annually, concentrated in spring and fall storm peaks - the same seasons the red clay is moving most. When gutters, downspouts, and grading direct that water toward the foundation instead of away, it pools in the crawlspace, raises humidity, and slowly rots the wood framing that holds your floors up. Poor drainage is the silent number-one contributor to foundation problems in Cobb County.
The core moisture fix is a vapor barrier: heavy polyethylene sheeting laid across the crawlspace soil and sealed at the seams and piers to block ground moisture from evaporating into the wood. The partner may pair it with regraded soil, extended downspouts, a French drain or sump pump, and in encapsulated crawlspaces a dehumidifier.
Because drainage drives so much foundation movement here, it is often addressed alongside the structural fix. See basement waterproofing for related drainage and seepage solutions on basement-plus-crawlspace homes.
How much does pier-and-beam foundation repair cost in Cobb County?
Pier-and-beam repair in Cobb County falls within the broader $3,500 to $25,000 foundation repair range, depending on scope. Shimming a few piers and adding a vapor barrier sits at the low end; full releveling with sister beams, joist replacement, and new piers costs more. The free inspection establishes your exact range first.
Cost scales with how much of the floor system is affected. A localized fix - shimming a settled pier, adding a vapor barrier, and correcting one downspout - lands near the bottom of the $3,500 to $25,000 range. Extensive work involving full releveling, multiple sister beams, joist replacement, and several new footings sits higher.
If a raised section needs deep underpinning, the contractor may recommend helical piers, which run $1,200 to $3,000 per pier with a typical job using 6 to 12 piers. Where the issue is a cracked masonry pier or foundation wall rather than the wood framing, crack injection (epoxy or polyurethane) runs $500 to $3,000. Learn more on our helical piers page.
The inspection is always free, and the homeowner pays nothing to Marietta Foundation Repair - the vetted local partner covers a referral fee. You get a written scope and price before committing to any work.
Which Cobb County areas have the most pier-and-beam homes?
Crawlspace and basement-plus-crawlspace homes are common in 1990s subdivisions across East Cobb, Kennesaw, Acworth, and Powder Springs, with older raised-foundation houses scattered through Marietta and Smyrna. Marietta Foundation Repair serves all of Cobb County and connects homeowners in any of these areas with one vetted local repair partner.
Cobb County's housing stock is mixed. Post-WWII brick ranches tend to sit on slab-on-grade, newer infill often uses post-tension slabs, but the wave of 1990s subdivisions in East Cobb (30062, 30068), Kennesaw (30144, 30152), Acworth (30101, 30102), and Powder Springs frequently combined a basement with crawlspace bump-outs - exactly the construction prone to the bouncy floors described above.
Older raised-foundation homes appear throughout Marietta (30060, 30064, 30067) and Smyrna as well. Wherever your home sits on Cobb's Piedmont red clay, the seasonal swell-shrink cycle and mature oak tree roots competing for moisture in that same clay put stress on piers and beams.
Marietta Foundation Repair covers the full service area - Marietta, East Cobb, Smyrna, Kennesaw, Acworth, and Powder Springs - connecting each homeowner with the same single vetted, licensed, and insured local contractor.
Frequently asked questions
Is pier-and-beam repair better than slab repair?
Neither is better; it depends on how your home was built. Pier-and-beam (crawlspace) homes are releveled with shims, sister beams, and joist repair, which is often more accessible than slab work. Slab-on-grade homes usually need underpinning like helical piers. The free inspection identifies which foundation type you have and the right fix.
Can I stay in my home during pier-and-beam releveling?
In most cases yes. Crawlspace releveling is done from below, and the contractor lifts the structure gradually to avoid cracking finishes. You may hear jacking activity and notice doors operating differently as the floor returns to level. The local partner will tell you during the free inspection if any area should be vacated temporarily.
How long does a vapor barrier last in a Marietta crawlspace?
A properly installed, sealed polyethylene vapor barrier typically lasts many years, provided it isn't punctured during later work and drainage stays under control. Because metro Atlanta sees 50-plus inches of rain a year, pairing the barrier with good gutters, grading, and sometimes a sump pump is what keeps the crawlspace dry long term.
Why do my floors bounce more in some seasons?
Cobb County's Piedmont red clay swells and shrinks 6 to 8 percent in volume between the wet spring and dry fall. As the soil dries and shrinks in late summer, piers can settle and lose contact with the beams above, leaving spans unsupported and bouncy. Releveling and shimming restore solid bearing.
Does Marietta Foundation Repair do the work itself?
No. Marietta Foundation Repair is a disclosed referral service, not a contractor. We connect Cobb County homeowners with one vetted, licensed, and insured local foundation repair partner who performs the inspection and all repairs. The homeowner pays nothing to us; the local partner covers a referral fee.
Is the pier-and-beam inspection really free?
Yes. The foundation inspection arranged through Marietta Foundation Repair is free to the homeowner, with no obligation. The vetted local partner assesses your piers, beams, joists, and crawlspace moisture, then provides a written scope and price. Repair costs fall within the $3,500 to $25,000 range depending on what your home needs.