Foundation Repair in Chamblee, GA Built for Georgia Red Clay and Older Homes

In a pier-and-beam home, the interior floor framing sits on CMU or brick piers. When those piers sink, lean or lose their shims, the girders and joists above lose support. That shows up as soft, bouncy or visibly sloping floors.

Chamblee's 1950s–60s ranches were built with shallow pier footings sitting in red clay that's been soaking and drying for 70 years. Humid summers keep crawlspace soil damp, so the footings settle slowly. The original wood shims crush or rot. Heavy subterranean termite pressure weakens girders and sill plates. A single dry summer followed by fall rains can make an older problem visibly worse.

• Floors that bounce or feel soft near the center of the house
• Gaps between baseboards and the floor
• Interior doors that swing open or won't latch
• Cracks above interior door frames
• Leaning or cracked piers visible in the crawlspace
• Crushed, split or missing shims

Very common in Huntley Hills, Sexton Woods and Keswick Park in Chamblee, Northwoods in Doraville, and the postwar streets around downtown Tucker. It usually shows up in ranches that still have original piers and have never had crawlspace moisture control.

Replace or rebuild failed piers on proper footings, install steel adjustable supports, sister or replace damaged joists and girders, then fix crawlspace moisture so it doesn't come back.

These are diagonal cracks that follow the mortar joints in brick or block walls. They usually point to differential settlement, where one part of the perimeter footing moves more than the rest. They're often worst at corners and around windows.

Red clay shrinks away from footings during droughts, and corners and downspout areas dry out or flood the fastest. Mature oaks near the house make the drying worse. Clogged clay or corrugated downspout lines dump roof water right at the footing. That one side of the house goes through a much harsher wet-dry cycle than the rest of the foundation.

• Zigzag cracks through mortar joints
• Cracks wider at the top than the bottom
• Brick separating from window or door frames
• Windows that stick after a dry summer
• Gaps where the chimney meets the wall
• Cracked drywall corners inside

We see this all the time on brick ranches in Ashford Park and Drew Valley in Brookhaven, and on homes with big water oaks within 20 feet of the foundation. It's also common where a tree removal or infill grading next door changed how the lot drains.

Stabilize the settling section with push or helical piers when needed, correct downspouts and grading, then repoint the mortar or repair the cracks so the brick matches.

A CMU block or poured basement wall can crack horizontally partway up and start bowing inward. Saturated soil pushing from outside, called hydrostatic and lateral earth pressure, does this. Left alone, the wall can keep moving and eventually fail.

Daylight basements here are cut into slopes, so uphill rain soaks straight into the clay backfill against the wall. Red clay holds water and gets heavy when wet. Near Tucker and Stone Mountain, shallow granite can trap perched groundwater against the wall. Perimeter drains on 1970s homes are often crushed or were never installed.

• A horizontal crack running along a block course
• Walls leaning or bowing inward
• Stair-step cracks at basement corners
• Efflorescence or water stains on the block
• Gaps where the wall meets the floor slab
• Damp spots after heavy rain

This is common in Dunwoody's Georgetown area, the hillside lots around Murphey Candler Park, Sandy Springs split-levels, and in Lilburn and Berkeley Lake, where basements sit into the hill and take the full load of the slope's runoff.

Brace the wall with wall anchors, steel I-beams or carbon fiber, then relieve the water pressure with exterior or interior drainage and better grading.

When a concrete slab, garage floor or porch rests on poorly compacted fill, it can settle unevenly. You'll see cracks, drops at the joints and trip hazards. Sometimes the slab pulls away from the house.

Many 1970s–90s subdivisions in north DeKalb and Gwinnett were built on cut-and-fill lots. The fill wasn't always compacted well, and some lots had stumps or construction debris buried in them. As that material decomposes and settles, it leaves voids. Heavy rain washes fine soil into those voids, and the slab sinks into them.

• Garage floor cracking or dropping at the door
• Porch or stoop pulling away from the house
• Gaps between the slab and the foundation wall
• Cracks in tile or flooring
• Driveway sections sinking or tilting
• Water pooling where it never used to

This shows up in Peachtree Corners and Norcross subdivisions, 1980s Tucker neighborhoods and Doraville cul-de-sacs. Garages built on the fill side of a graded lot are the usual suspects.

Lift and level the slab with polyurethane foam or mudjacking. Use piers where the settlement is deep, and seal the joints to keep water out of the subgrade.

A crawlspace with standing water, high humidity, condensation or mold slowly rots the sill plates, joists and subfloor. It also invites termites and sends musty air up into the living space.

Chamblee's July humidity regularly pushes past dew point inside vented crawlspaces, and the moisture condenses on cool ductwork and framing. Negative grading and clogged downspouts send rainwater under the house, and clay soil holds it there. Most postwar homes have dirt floors and open vents, which pull in humid air all summer.

• Musty odors inside the home
• Standing water or mud after rain
• Mold or white fuzz on joists
• Sagging or wet insulation
• Rust on ductwork and nails
• Cupping hardwood floors

This is nearly universal in older Chamblee, Doraville and Clarkston crawlspace homes, and in low-lying lots near the North Fork Peachtree Creek and Nancy Creek tributaries. It's often found together with sagging piers.

Fix the drainage, replace rotted framing and encapsulate with a vapor barrier. Seal the vents and add dehumidification so structural repairs stay dry.

Many early-20th-century homes sit on brick piers laid with soft lime mortar over shallow footings, and some have no continuous foundation at all. Over time the mortar erodes, the piers lean, and the house settles unevenly.

Lime mortar softens over a century of humidity and moisture cycling. These homes were built before modern drainage standards, so the soil near the piers stays wet. Large old hardwoods in intown neighborhoods dry out sections of soil during droughts, and historic district rules mean the visible brick and skirting have to be preserved.

• Crumbling or sandy mortar in piers
• Piers leaning or bulging
• Uneven floors from room to room
• Cracked plaster walls
• Gaps at the porch connection
• Doors racked out of square

This is typical in the Druid Hills Historic District, Oakhurst and Winnona Park in Decatur, Avondale Estates, Scottdale and older streets in historic downtown Norcross. Owners there want the original appearance kept intact.

Repoint or rebuild piers with compatible mortar and add concealed footings or supplemental supports. Keep the visible original brick, and coordinate with the historic commission when exterior changes are needed.

Thin vertical or random cracks in poured walls and floor slabs. Most come from concrete shrinking as it cured and aren't structural. They can still let in water, radon and insects.

Concrete naturally shrinks as it cures, and Georgia's wet-dry cycling opens and closes these cracks every season. Water drains slowly through clay, so even small cracks see repeated moisture after big storms.

• Vertical hairline cracks under 1/8 inch
• Damp lines after heavy rain
• Minor efflorescence
• Cracks that haven't grown in months
• No uneven floors or sticking doors

Found in nearly every age of home, from 1990s Dunwoody slab homes to new infill townhomes around downtown Chamblee and Brookhaven. We often get asked about them during home inspections.

Seal with epoxy or polyurethane injection and monitor. We'll tell you plainly if a crack is cosmetic and doesn't need structural work.