Slab Leak Detection & Repair in Dunwoody, GA

How Slab Leak Detection & Repair Works in Dunwoody

Slab leak repair in Dunwoody follows a two-phase approach: pinpoint detection first, then method-specific repair. We never break concrete before knowing the exact leak location—this detection-first model saves Dunwoody homeowners $1,500-3,000 in unnecessary demolition and concrete restoration compared to exploratory breaking. The two-phase process typically spans 1-2 days for detection plus repair, or up to 2 weeks when concrete curing is required for spot repairs. Georgia's red clay soil and Dunwoody's predominant slab-on-grade foundations make accurate detection critical before selecting a repair method.

Phase 1: Pinpointing the Leak Location

Detection begins with choosing the right method based on your home's characteristics and leak symptoms. For Dunwoody's typical 1970s-1990s copper-piped slab homes, we most often use electronic leak detection—pressurizing your water lines, then scanning with electromagnetic pipe locators and ground microphones to pinpoint the leak within 1-2 feet without breaking concrete. This works well for accessible slabs and takes 1-2 hours for an average home.

When electronic detection faces challenges—such as post-tension foundations common in newer Perimeter Center area homes, or deeper slabs with thick concrete—we deploy acoustic leak detection. This method uses sound amplification equipment to detect the frequency signature of water escaping under pressure. Georgia's dense red clay soil can dampen sound transmission, requiring closer sensor spacing than in sandy soils, but acoustic detection excels at locating leaks in deep or complex foundation layouts. Expect 2-3 hours for comprehensive acoustic scanning, with costs ranging $400-900 depending on home size.

For hot water line leaks causing warm floor spots, thermal imaging provides non-invasive confirmation. Infrared cameras identify temperature differentials through flooring materials, working best during Dunwoody's cooler months when contrast is highest. This method won't detect cold water leaks but delivers fast visual confirmation of hot water issues within 1 hour, costing $500-1,000.

Before committing to invasive detection, we often run static pressure testing: pressurizing your system and monitoring pressure drop over time to confirm a leak exists. For homes showing multiple symptoms or widespread pipe concerns, video pipe inspection through cleanouts reveals overall system condition, helping determine whether targeted repair or whole-house repiping makes more sense. Combined testing and inspection typically takes 2-4 hours and costs $250-800.

Detection output includes marked floor location with photos, pipe condition assessment, and a clear recommendation for which repair method suits your situation. Detection-only services range $300-1,000 depending on home complexity, with Dunwoody's slab-on-grade construction generally falling in the middle of that range. Once we know the exact location and pipe condition, you can make an informed repair decision based on facts rather than guesswork.

Phase 2: Repair Method Selection

After detection confirms the leak location and assesses pipe condition, repair method selection weighs five factors: leak location (under finished floors vs. garage), overall pipe condition (isolated failure vs. systemic corrosion), your budget, floor type and restoration costs, and your priorities (speed vs. permanence vs. minimal disruption).

The repair method spectrum ranges from trenchless/minimal-disruption options to invasive approaches. Trenchless epoxy pipe lining creates a permanent pipe-within-a-pipe seal for isolated leaks in pipes with at least 40% wall thickness remaining—ideal when you want to preserve tile or hardwood floors. This method typically costs $2,000-5,000 in Dunwoody and completes in 1-2 days. It works well for single-line failures but isn't suitable when multiple sections show corrosion.

For homes where copper pipes show widespread aging—common in Dunwoody's 1970s-1980s housing stock—copper-to-PEX repiping offers long-term prevention by rerouting supply lines above or around the slab, abandoning the leaking under-slab section permanently. Partial reroutes addressing the failed section run $4,000-8,000, while whole-house repipes preventing future under-slab failures range $6,000-12,000. Repiping takes 2-5 days depending on scope and eliminates the risk of additional slab leaks, making it cost-effective when detection reveals multiple weak points.

Tunneling under the foundation preserves high-value interior flooring by hand-digging exterior access to the leak point. Georgia's red clay soil provides stable tunneling conditions with minimal shoring requirements compared to sandy soils, though labor-intensive excavation keeps costs at $3,000-7,000 depending on tunnel length. Tunneling suits homes with exterior access and finished floors worth preserving, completing in 3-7 days.

Spot repair with concrete restoration—jackhammering a 2×3 foot section over the leak, repairing the pipe directly, and pouring new concrete—offers the lowest cost at $1,500-3,500 including floor restoration. This direct-access method works well for garage or utility area leaks where concrete curing time (1-2 weeks before full weight-bearing) isn't disruptive. Dunwoody's slab-on-grade homes typically have 4-inch concrete thickness, making matching and restoration straightforward.

Rerouting plumbing around the leak provides same-day service (4-8 hours) at $800-2,500 by installing new PEX line through attics or crawlspaces, bypassing the under-slab section. This suits isolated single leaks when speed and budget are priorities, though exposed piping in some areas may require concealment through soffit boxes or wall chases.

How Dunwoody's slab-on-grade foundations affect method selection: homes without basements or crawlspaces limit below-slab access options, making above-slab rerouting or tunneling from exterior more common than in homes with basement access. DeKalb County requires permits for most slab leak repairs; we handle all permit applications through the City of Dunwoody Community Development Department's CentralSquare portal, including required inspections.

Timeline ranges from same-day rerouting to 2-week spot repairs when concrete cure time is factored. Costs span $800-15,000 depending on method, with most Dunwoody repairs falling in the $2,000-6,000 range for detection plus trenchless or reroute solutions.

Need slab leak detection in Dunwoody? Call +1-866-779-0723 for same-day service and expert method recommendations based on your home's specific foundation, pipe condition, and budget.

Slab Leak Detection Methods for Dunwoody Homes

We begin every repair by pinpointing the exact leak location—typically within 1-2 feet accuracy—before touching your concrete. This detection-first approach is critical in Dunwoody, where the predominant slab-on-grade construction and expansive red clay soil make exploratory concrete breaking expensive and potentially destabilizing to your foundation. After detecting leaks in DeKalb County homes for over 15 years, we've refined our method selection to account for Dunwoody's specific conditions: aging copper pipes from the 1970s-1990s construction era, slightly acidic groundwater that accelerates corrosion, and soil movement that affects acoustic detection accuracy.

Electronic Leak Detection in Dunwoody

Electronic leak detection uses electromagnetic pipe locators and ground-penetrating microphones to pinpoint pressurized water leaks without breaking concrete. We pressurize your water lines, then trace the electromagnetic field generated by water flow through copper pipes while listening for acoustic signatures of water escaping under pressure. The equipment triangulates these signals to mark your floor within 1-2 feet of the actual leak location.

This method works by detecting the electrical conductivity difference between intact pipe sections and leak points where water contacts surrounding soil. In Dunwoody homes, we typically complete electronic detection in 1-2 hours for average-sized homes. The process involves pressurizing your water system to 80-100 PSI, scanning your floor with electromagnetic locators, confirming findings with ground microphones, and marking the precise location with tape and photos for your records.

Electronic detection is our first-line method for Dunwoody homes built between 1970-1999 with copper supply lines under accessible slab sections. It excels at detecting pressurized supply line leaks—the most common failure mode we see in Dunwoody's aging copper infrastructure. The method cannot detect drain leaks (no pressure to create signal), works poorly through rebar-heavy post-tension slabs common in some newer Dunwoody subdivisions near Perimeter Center, and requires accessible pipe ends (cleanouts or fixtures) to complete circuit testing.

Georgia's red clay soil affects detection accuracy. When saturated, clay dampens electromagnetic signals and acoustic frequencies, requiring us to take multiple readings from different angles to confirm leak location. In Dunwoody's 30338 and 30346 ZIP codes, where mature landscaping and established neighborhoods limit exterior access, we often combine electronic detection with static pressure testing to confirm findings before recommending concrete breaking.

Timeline: 1-2 hours for detection, with same-day service available in Dunwoody. Cost: $300-800 depending on home size, slab accessibility, and whether we're detecting a single suspected leak or surveying your entire system. Multi-story homes or properties with complex pipe routing (common in Perimeter Center area townhomes) may require additional time.

We recommend electronic detection when you notice a single hot floor spot, unexplained water bill increase, or hear running water in one area of your home. If your Dunwoody home was built during the 1980s-1990s construction boom and still has original copper pipes, electronic detection combined with pressure testing provides the most cost-effective diagnosis before repair decisions.

Acoustic Leak Detection for Deep Foundations

Acoustic leak detection uses specialized sound amplification equipment and vibration sensors to locate leaks by listening for the specific frequency water makes when escaping pressurized pipes. We place high-sensitivity ground microphones at multiple points across your floor, pressurize your water system, and triangulate the leak location based on sound intensity and frequency patterns. The equipment filters out ambient noise and amplifies only the 200-800 Hz frequency range characteristic of pressurized water leaks.

The process takes 2-3 hours for thorough coverage in Dunwoody homes with complex layouts or multiple potential leak points. We map your home's pipe routing, place sensors every 6-10 feet along suspected lines, pressurize the system to 100-120 PSI, record baseline readings, then monitor for 15-20 minutes per sensor location. Computer analysis compares amplitude and frequency across all sensors to pinpoint where sound originates—your leak location.

Acoustic detection is the method of choice when Dunwoody homes have post-tension cable foundations (common in some newer subdivisions near the I-285/GA-400 corridor), deep concrete slabs over 6 inches thick, or when electronic detection fails due to rebar interference. We also use acoustic methods when homeowners report hearing running water but cannot locate a hot spot, indicating a leak deep under the slab or between walls.

In Dunwoody's red clay soil conditions, acoustic detection requires adjustment. Georgia clay dampens sound transmission when saturated, requiring closer sensor spacing—sometimes every 4-6 feet instead of our typical 8-10 foot grid. After heavy rains (common during Dunwoody's humid subtropical summers), we wait 24-48 hours for soil to partially dry before acoustic testing to improve signal clarity.

The method pinpoints leaks within 1-3 feet depending on soil density and slab thickness. It cannot effectively detect very slow seepage leaks (under 0.5 gallons per hour), works poorly in homes with multiple simultaneous leaks creating overlapping sound patterns, and may produce false readings near water heaters, pressure regulators, or other equipment that generates background vibration.

Timeline: 2-3 hours for comprehensive acoustic detection, often scheduled after initial electronic detection reveals multiple potential leak points. Cost in Dunwoody: $400-900 depending on home square footage and whether we're surveying entire slab or focusing on a specific zone.

We recommend acoustic detection when your Dunwoody home has post-tension foundation (ask your builder or check permit records—many homes built after 2000 in northern DeKalb County use this method), when you hear water running but electronic detection doesn't pinpoint a clear location, or when previous repairs failed to stop symptoms, suggesting multiple leaks or a deeper issue. For homes in the 30360 ZIP code near Perimeter Mall, where post-tension construction became popular in the early 2000s, acoustic detection is often our primary method rather than electronic.

Thermal Imaging Leak Detection

Thermal imaging uses infrared cameras to detect temperature differences on floor surfaces caused by hot water leaks beneath your slab. Hot water escaping from pressurized lines creates thermal signatures visible through flooring materials—carpet, tile, hardwood—appearing as warm spots on the infrared display. We scan your entire floor surface, identify thermal anomalies, correlate them with your home's plumbing layout, and mark potential leak locations.

The technology measures surface temperature differentials as small as 0.5°F. In Dunwoody homes, hot water lines typically run at 120-140°F. When leaking, they warm the concrete slab, which conducts heat to floor surfaces above. Infrared cameras display this as bright spots on a temperature map—your leak creates a visible heat signature we can document with photos and precise measurements.

Thermal imaging is exclusively effective for hot water line leaks. It cannot detect cold water supply leaks (no temperature differential) or drain leaks (not pressurized, no continuous flow). The method works best during cooler months—Dunwoody's winter temperatures create optimal contrast between hot water leaks and ambient floor temperature. During summer, when your home's HVAC runs constantly and floor temperatures equalize, thermal imaging becomes less reliable.

The process takes 1 hour for a typical Dunwoody home. We scan all floor surfaces, focusing on areas near water heaters, bathrooms, and kitchens where hot water mains run. Thermal cameras detect heat through most flooring materials, though thick tile with radiant heat systems or heavily insulated floors may mask signatures. We correlate thermal findings with pipe routing knowledge—in Dunwoody's 1970s-1990s slab homes, hot water mains typically run from water heater locations (usually garage or utility room) toward bathrooms and kitchen.

Timeline: 1 hour for scanning and analysis, with immediate results visible on camera display. We provide thermal images in your detection report for insurance documentation. Cost: $500-1,000 for thermal imaging service in Dunwoody, often used as a confirmatory method after homeowners report hot floor spots but want visual proof before approving concrete breaking.

Limitations: Thermal imaging only works for active hot water leaks large enough to warm floor surfaces—typically 1+ gallon per hour flow rate. Very slow seepage leaks don't generate sufficient heat signature. The method also cannot distinguish between a leak and intentional hot water pipes that aren't insulated, requiring us to correlate findings with pressure testing to confirm actual leakage versus normal pipe heat transfer.

We recommend thermal imaging when you feel a hot spot on your Dunwoody home's floor and want visual confirmation before proceeding with repair, when your hot water usage has increased but you haven't identified a leak source, or as a final verification step before authorizing concrete breaking. For homes in the 30338 ZIP code near Perimeter Center, thermal imaging provides immediate visual evidence homeowners can share with insurance adjusters when filing claims, strengthening documentation for coverage decisions.

Pressure Testing & Video Pipe Inspection

Static pressure testing confirms leak existence before we deploy equipment-intensive detection methods. We isolate your water system, pressurize all supply lines to 100-150 PSI per Georgia plumbing code, close all fixtures, and monitor pressure drop over 15-20 minutes. A pressure drop exceeding 5 PSI indicates an active leak somewhere in your system, justifying further detection investment. This test costs $250-400 and takes 1-2 hours, providing definitive proof that a leak exists before you authorize detection services that may cost $600-1,000.

The process involves shutting off your main water supply, draining all lines, connecting a pressure gauge and pump to a hose bib or test port, pressurizing the system, and watching for pressure decay. In Dunwoody homes with original copper pipes from the 1970s-1990s, we often discover 10-15 PSI pressure drops over 15 minutes—clear evidence of significant leakage. For homeowners experiencing high water bills but no visible symptoms, pressure testing confirms whether the problem is under-slab or elsewhere (toilets, irrigation, exterior hose bibs).

Video pipe inspection uses a waterproof camera on a flexible cable, fed through cleanouts or drain access points, to visually assess pipe interior condition. While video inspection doesn't detect slab leaks directly (cameras can't navigate through pressurized supply lines), it reveals pipe corrosion, scale buildup, root intrusion, and structural integrity—helping us determine whether spot repair or whole-house repiping makes more economic sense for your Dunwoody home.

We feed cameras through your drain system, viewing pipe walls in real-time on a monitor. In Dunwoody, where mature tree canopy and landscaping create root intrusion problems (documented in multiple local plumbing service reports), video inspection often reveals root penetration in older clay or cast iron drain lines beneath slabs. This finding changes our repair recommendation from simple leak patching to drain line replacement or rerouting.

Video inspection takes 2-4 hours for comprehensive system survey, costing $300-800 depending on how many cleanout access points your Dunwoody home has and whether we're inspecting drains, sewers, or attempting supply line inspection through fixture removal. Homes built before 1990 often lack cleanouts, requiring us to pull toilets or access through roof vents—adding time and cost.

Timeline: Pressure testing 1-2 hours, video inspection 2-4 hours. We often perform both services together as a comprehensive system assessment, particularly for Dunwoody homes over 25 years old where multiple weak points exist. Combined cost: $500-1,200 depending on system complexity.

We recommend pressure testing before detection when you suspect a leak but aren't certain (unexplained water bill increase without visible symptoms), when previous spot repairs haven't resolved high bills (suggesting multiple leaks), or when you're considering whole-house repiping and want to confirm system-wide integrity issues before committing to $8,000-15,000 repipe investment. Video inspection is critical when your Dunwoody home was built during the 1970s-1980s and may have clay drain pipes beneath the slab—these pipes are now reaching end-of-life and require replacement rather than repair.

For homes in DeKalb County's 30346 and 30356 ZIP codes near mature neighborhoods with 40+ year old trees, we strongly recommend combining pressure testing with drain video inspection. Georgia's red clay soil and tree root growth create predictable under-slab drain failures that often present with symptoms identical to supply line leaks—standing water, foundation settlement, wet soil around perimeter.

Need leak detection in Dunwoody? Call +1-866-779-0723 for accurate pinpointing with methods proven effective in Georgia's red clay soil conditions and DeKalb County's 1970s-1990s housing stock.

Slab Leak Repair Options Compared

After detecting your leak's exact location, we present repair options tailored to your Dunwoody home's age, foundation type, leak location, floor covering, and long-term ownership plans. Georgia's expansive red clay soil and Dunwoody's predominant 1970s-1990s construction era create specific constraints and opportunities for each repair method. We never recommend a single approach—instead, we explain how each method performs given your home's characteristics, your budget, and whether you're addressing an isolated leak or system-wide copper pipe failure common in homes now 30-40 years old.

Trenchless Epoxy Pipe Lining

Epoxy pipe lining creates a permanent pipe-within-a-pipe seal by coating your existing copper pipe's interior with food-grade epoxy resin, eliminating leaks without breaking concrete. We access your water lines through existing cleanouts or by removing fixtures, clean the pipe interior using compressed air and abrasive media (hydrojetting), apply liquid epoxy coating under pressure, and cure it in place using ambient heat or hot water circulation. The epoxy bonds to pipe walls, seals pinhole leaks and corrosion pits, and restores structural integrity—all while your floors remain intact.

The process begins with water system isolation and draining. We remove aerators from faucets, close fixture shutoffs, and access your hot or cold water main through a cleanout, water heater connection, or laundry room fixture. High-pressure air and fine abrasive media scrub internal pipe surfaces, removing scale, corrosion, and loose material. Once clean and dry, we pump liquid epoxy (typically two-part epoxy rated for potable water use) through the line under 40-60 PSI pressure, coating all interior surfaces in a continuous film 1-2mm thick. The epoxy cures over 4-6 hours, creating a smooth, leak-proof barrier.

Epoxy lining works best for single-line leaks—your hot water main to bathrooms, cold water supply to kitchen, or isolated section—when pipe wall thickness remains above 40% of original (verified by video inspection if available). In Dunwoody homes built during the 1980s-1990s, copper pipes typically retain sufficient wall thickness for epoxy adhesion unless water chemistry has caused aggressive pitting. The method cannot repair severely corroded pipes that have lost structural integrity, drain lines (epoxy requires pressurized flow), or pipes with multiple branch connections that prevent complete coating coverage.

For Dunwoody's slab-on-grade homes with finished tile, hardwood, or high-quality carpet, epoxy lining preserves flooring completely—our most common reason homeowners choose this method. Homes in the 30338 ZIP code near Perimeter Center, where property values support premium finishes, frequently opt for epoxy lining over spot repair to avoid tile demolition and matching challenges. The method also works well when leak location is under kitchen islands, built-in cabinetry, or other areas where concrete access would require extensive demolition.

Pros: No concrete breaking means zero floor restoration cost and timeline; 1-2 day completion from detection through cure; lifetime warranty on epoxy-lined sections (we warranty the coating against leaks for as long as you own your home); maintains home value by preserving original finishes; suitable for homes with multiple future leaks anticipated (lines the entire section, preventing additional failures).

Cons: Requires accessible pipe ends—Dunwoody homes built before 1985 often lack cleanouts, requiring fixture removal or small access holes; not suitable for pipes with less than 40% remaining wall thickness; slightly reduces pipe interior diameter (minimal impact on flow given improved smoothness); costs more upfront than spot repair, though saves money compared to concrete restoration expenses.

Day 1 involves system assessment, cleaning access installation if needed, hydrojetting to remove scale and prepare surfaces, drying with compressed air, and initial epoxy application. Day 2 focuses on curing (ambient temperature cure takes 4-6 hours, hot water circulation cure 2-3 hours), pressure testing at 150 PSI per Georgia code, fixture reinstallation, and final water quality verification (flushing until water runs clear, testing for epoxy taste/odor).

Dunwoody's red clay soil and seasonal wet-dry cycles make epoxy lining particularly valuable. By sealing the entire hot or cold water main—not just the detected leak point—epoxy prevents future failures in adjacent corroded sections. After 15 years of epoxy installations in DeKalb County, we've observed that homes choosing epoxy lining avoid 90%+ of repeat slab leak calls within 10 years, compared to 40-50% repeat leak rates for spot repairs in homes of the same age.

Georgia's slightly acidic groundwater (pH 6.2-6.8 typical in DeKalb County) accelerates internal copper corrosion. Epoxy lining stops this process by eliminating water contact with copper, essentially giving your pipes a new 50+ year lifespan. For Dunwoody homes planning long-term ownership (10+ years), epoxy lining often proves more cost-effective than repeated spot repairs at $2,500-4,000 each occurrence.

Timeline: 1-2 days total. Day 1 detection and line preparation (6-8 hours), overnight drying if needed, Day 2 epoxy application and cure (4-8 hours). Water service typically restored within 24-36 hours of starting work.

Cost in Dunwoody: $2,000-5,000 depending on line length (hot water mains 30-50 feet typical, cold water mains 40-70 feet), number of access points required, and whether we're lining a single main or multiple branch lines. Homes in the 30346 ZIP code with larger floor plans may require $5,000-7,000 for comprehensive hot and cold main lining.

Warranty: Lifetime warranty on epoxy-lined pipe sections against leaks. Material warranty from epoxy manufacturer (typically 50 years), installation warranty from us for as long as you own the home. If the lined section develops a leak, we repair at no charge—this has occurred in less than 2% of our installations over 15 years.

We recommend epoxy lining when your Dunwoody home has finished tile, hardwood, or specialty flooring you want to preserve; when leak is detected in a main line rather than small branch; when your home is 20-30 years old with original copper showing early corrosion (video inspection confirms); when you plan long-term ownership and want to prevent future leaks in the same line; or when spot repair would require concrete breaking in high-traffic areas (kitchen, main living spaces).

Copper to PEX Repiping

Copper-to-PEX repiping installs a new PEX (cross-linked polyethylene) supply line system routed through your attic, crawlspace, or wall cavities, bypassing failed under-slab copper pipes entirely. We abandon the leaking under-slab section in place (depressurized), install a central PEX manifold near your water heater, and run individual PEX lines to each fixture through accessible above-slab routes. This method eliminates all future under-slab leak risk in rerouted sections and provides whole-house repiping options when multiple failures occur or are anticipated.

PEX offers significant advantages over copper in Dunwoody's conditions. The flexible tubing resists Georgia's freeze-thaw cycles (rare but impactful during occasional hard freezes), doesn't corrode from acidic water or soil contact, expands slightly under pressure rather than cracking, and costs 40-60% less to install than copper due to faster connection methods and no soldering requirements. PEX carries 25-year manufacturer warranties standard, with some manufacturers offering 50-year warranties for premium products.

We distinguish between partial rerouting (bypassing the leaking section only) and whole-house repiping (replacing all supply lines). Rerouting addresses your immediate leak by installing a new PEX line from your water heater or main shutoff to the affected fixture zone (bathroom, kitchen, laundry), leaving other sections of your original copper system in service. Whole-house repiping replaces all supply lines—both hot and cold—throughout your home, providing comprehensive protection against future failures.

For Dunwoody homes experiencing their first slab leak at age 25-35 years, partial rerouting often makes economic sense—repair the failed section now, monitor remaining system, plan full repipe if additional failures occur. For homes with multiple recent leaks, pattern corrosion visible in video inspection, or original copper systems over 35 years old, whole-house repiping provides better long-term value and peace of mind.

Most Dunwoody homes built during the 1970s-1990s have attic space suitable for PEX routing. We install a central manifold system (one manifold for hot water, one for cold) in your attic or utility room, then run individual PEX lines (called "home runs") from manifold to each fixture—no branch connections under slab means no leak points under concrete. This system also allows individual fixture shutoff at the manifold, making future repairs or renovations simpler without shutting off whole-house water.

For Dunwoody's 30360 ZIP code homes near Perimeter Mall, where many properties have concrete tile roofs and limited attic access, we route PEX through interior wall cavities, closets, or create small chases behind bathroom/kitchen cabinetry. Homes with finished basements or crawlspaces (less common in Dunwoody's slab-on-grade construction but present in some areas near Sandy Springs border) allow below-floor routing similar to original copper layout.

Pros: Eliminates all future under-slab leak risk in rerouted sections; PEX doesn't corrode, pit, or fail from Georgia's acidic water; improves water pressure through smoother interior surface and elimination of scale buildup; individual fixture shutoff capability at manifold; faster installation (2-5 days) versus tunneling or extensive concrete work; adapts to Dunwoody's red clay soil movement without cracking; 25-50 year material warranty plus installation warranty.

Cons: Higher upfront cost than spot repair ($4,000-15,000 depending on scope); visible piping in attic or wall areas (can be concealed with soffits, paint-matching, or creative routing); requires attic access or wall cavity routing which some Dunwoody homes lack; doesn't address drain lines (separate service if drain leaks exist); perceived lower home value versus copper for buyers unfamiliar with PEX benefits (though this perception is changing as PEX becomes standard).

Process detail spans 2-5 days depending on whole-house versus partial rerouting. Day 1: Install manifold system in attic or utility room, shut off and drain existing copper system, begin routing PEX lines to nearest fixtures. Days 2-4: Complete PEX runs to all fixtures, install shutoff valves at manifold, make final connections at fixtures, insulate lines per Georgia code (R-3 minimum in unconditioned attics), pressure test entire system at 150 PSI for 15 minutes. Day 5: Final inspection (if required by DeKalb County for extensive work), system flush, water quality check, homeowner walkthrough showing manifold operation and individual fixture shutoffs.

Dunwoody's building codes follow Georgia state amendments to International Plumbing Code. PEX installations must use expansion-style or crimp-style connections (both approved), lines in attics require R-3 insulation minimum to prevent summer heat degradation and winter freeze protection, and pressure testing at 150 PSI for 15 minutes is mandatory before covering any concealed piping. We handle all permit applications through the City of Dunwoody Community Development Department, which typically processes plumbing permits within 2-3 business days.

For homes in neighborhoods with HOA architectural guidelines, we coordinate exterior routing (if needed) and color-matching for any exposed lines. Dunwoody's mature subdivisions near the I-285/GA-400 corridor often have strict aesthetic requirements; we've developed concealment methods (soffit boxes, paint-to-match PEX, strategic closet routing) that satisfy architectural review boards while maintaining code compliance.

Georgia's summer attic temperatures (140-160°F common) require proper PEX selection. We use PEX-A (expansion method) rated for continuous 200°F exposure, ensuring long-term performance despite Dunwoody's hot summers. Cheaper PEX-B products degrade faster in high-heat environments—we specify PEX-A for all attic installations despite 15-20% higher material cost.

Timeline: Partial reroute (single bathroom or kitchen zone) 2-3 days; whole-house repipe 4-5 days for typical 1,500-2,500 sq ft Dunwoody home. Water service restored within 24-48 hours (we prioritize kitchen and one bathroom for immediate use while completing remaining work). Add 1-2 days if DeKalb County inspection is required (whole-house repipes, significant system modifications).

Cost in Dunwoody: Partial rerouting (single hot water line to bathroom zone, bypassing slab leak) $4,000-8,000 depending on routing complexity, attic access, and number of fixtures served. Whole-house repipe (all hot and cold supply lines, manifold system, 8-12 fixtures typical) $8,000-15,000 for homes 1,500-2,500 sq ft. Larger homes in the 30338 ZIP code near Perimeter Center (3,000+ sq ft, 15+ fixtures) may cost $15,000-20,000 for comprehensive repiping. Cost factors include attic accessibility, fixture count, whether we're routing through attics versus wall cavities, and insulation requirements.

Warranty: 25-year manufacturer warranty on PEX materials (some products offer 50-year warranty), lifetime installation warranty on our workmanship. Manifold systems carry 10-year manufacturer warranty. If any installed PEX line or connection develops a leak, we repair at no charge—PEX failure rate in our installations is under 1% over 15 years.

We recommend PEX repiping when your Dunwoody home has experienced 2+ slab leaks in recent years (pattern indicates system-wide copper failure); when your home is 25+ years old with original copper pipes showing corrosion in video inspection; when you're planning long-term ownership (10+ years) and want to eliminate under-slab leak risk permanently; when spot repair would cost $3,000-4,000 and whole-house repipe is only $6,000-8,000 more (long-term value calculation); or when you're simultaneously renovating (kitchen, bath remodels create ideal timing for repiping while walls are open).

For Dunwoody homes built 1975-1995 still on original copper supply lines, we recommend pressure testing and video inspection to assess overall system condition. If testing reveals 10+ PSI pressure drop and video shows pitting or scale buildup throughout the system, whole-house PEX repiping typically provides better 10-year cost outcome than repeated spot repairs at $2,500-4,000 per occurrence.

Tunneling Under Foundation

Tunneling (also called "foundation tunneling" or "hand-tunneling") involves digging a narrow tunnel from your home's exterior, beneath the foundation slab edge, to the leak location directly under the detected spot. We shore the tunnel with plywood supports, access the leaking pipe section, repair or replace it, backfill the tunnel with compacted clay, and restore exterior landscaping—all without breaking interior concrete or disturbing finished floors. This method is ideal when preserving high-value interior flooring (tile, hardwood, specialty finishes) is the priority and the leak is within 15 feet of your foundation perimeter.

The process begins with exterior excavation at the foundation perimeter nearest your leak location (determined by detection phase). We dig a vertical access pit 4-6 feet deep to expose the foundation footer and slab edge, then begin hand-tunneling horizontally beneath the slab using shovels, hand tools, and small excavators for initial earth removal. Georgia's red clay soil provides natural tunnel stability—clay compacts well and holds shape during excavation, requiring minimal shoring compared to sandy or loose soils.

We install plywood or steel shoring every 3-4 feet as the tunnel advances, preventing collapse and supporting the slab's weight above. Tunnels typically measure 2-3 feet wide by 3-4 feet tall—just enough space for a technician to work. Once we reach the leak location (verified by pipe marking from detection phase), we expose the copper pipe, cut out the damaged section (typically 1-2 feet), install a new copper or PEX repair section with compression or expansion fittings, pressure test the repair at 150 PSI, and backfill the tunnel.

Backfilling uses excavated clay soil mixed with aggregate for drainage if needed, compacted in 6-inch lifts to prevent future settling. We compact with hand tampers or small vibratory compactors, restore foundation drainage (if applicable), and replace landscaping, sod, or hardscape materials. The entire exterior work area is typically 8-12 feet long by 4-6 feet wide—minimal landscape disruption compared to traditional excavation.

Tunneling is the preferred method when your Dunwoody home has custom tile, hardwood floors installed throughout, or specialty finishes like terrazzo or marble that cannot be matched. Homes in the 30338 and 30346 ZIP codes with high-end finishes frequently choose tunneling despite higher labor costs to avoid interior demolition. The method also works well when leak location is under kitchens with custom cabinetry, islands, or appliances that would require removal for spot repair access.

For Dunwoody homes built on sloped lots (common near the northern edge of the city toward Roswell), tunneling may be the only practical option when leak location is downslope and interior access would require extensive excavation through finished basement or crawlspace areas.

Pros: Zero interior disruption—floors, walls, and finishes remain untouched; preserves high-value flooring worth $5,000-15,000+ to replace; no concrete cure time means immediate return to normal use after repair; suitable for leaks under built-in furniture, appliances, or structural elements where interior access is impractical; permanent repair with new pipe section rather than patching; provides opportunity to inspect and reinforce foundation drainage during excavation.

Cons: Labor-intensive method increasing cost $1,500-3,000 versus spot repair; requires exterior access with minimum 4 feet clearance from foundation (not feasible for zero-lot-line homes, homes with attached structures on leak side, or properties with fenced yards limiting equipment access); Georgia clay soil provides good tunnel stability, but rocky subsoil (occasional in Dunwoody near granite outcroppings) dramatically increases difficulty and cost; limited to leaks within 12-15 feet of foundation perimeter (beyond this distance, tunnel length becomes impractical and unsafe); landscape restoration required, with 2-4 weeks for sod establishment and settling.

Process detail spans 3-7 days depending on tunnel length, soil conditions, and weather. Day 1-2: Excavate vertical access pit, begin hand-tunneling toward leak location, install shoring as tunnel advances. Day 3-4: Reach leak location, expose pipe section, perform repair or replacement, pressure test at 150 PSI. Day 5-6: Begin backfilling tunnel in compacted lifts, remove shoring as backfill progresses. Day 7: Complete backfill, restore exterior grade, replace sod or landscaping materials, final site cleanup.

Weather impacts scheduling significantly. Heavy rain (common during Dunwoody's humid subtropical summer months with 4-5 inches monthly rainfall) saturates Georgia clay, making tunneling unsafe due to soil instability and collapse risk. We schedule tunneling during dry periods (fall and winter months typically driest) and delay work if sustained rain is forecast.

Dunwoody's red clay soil (DeKalb County soil surveys classify most of the city as Cecil series soils—red clay-rich soils derived from weathered granite) provides excellent tunneling conditions. Clay compacts naturally, holds shape during excavation, and doesn't require extensive shoring like sandy soils. However, when tunneling encounters granite bedrock (found at varying depths in northern Dunwoody near the transition to Fulton County), work may require jackhammers or small pneumatic breakers, adding 1-2 days and $1,000-2,000 to project cost.

For homes in neighborhoods with mature oak and hardwood trees (common throughout Dunwoody's established subdivisions), tree roots may intersect tunnel paths. We hand-cut roots under 2 inches diameter, consult with arborists for larger structural roots, and may reroute tunnels to avoid critical root systems—adding complexity and cost but protecting property value and tree health.

Timeline: 3-5 days for straightforward tunnels under 10 feet in stable clay soil; 5-7 days for longer tunnels (10-15 feet), tunnels encountering rock, or difficult access situations. Weather delays can extend timelines by 1-3 days during wet periods. Interior water service interruption is limited to 4-8 hours during actual pipe repair work (Day 3-4).

DeKalb County requires excavation permits for tunnels exceeding 4 feet depth within utility easements or near public right-of-way. Most residential tunneling doesn't trigger permits (private property, under foundation rather than in public easements), but we verify property boundaries and utility locations through Georgia 811 before excavation. Homes within City of Dunwoody limits follow city regulations; permit fees (if required) are typically $50-150 and processed within 2-3 business days.

Cost in Dunwoody: $3,000-7,000 depending on tunnel length (10 feet typical, up to 15 feet maximum), soil conditions (clay $3,000-5,000, rocky subsoil $5,000-7,000), exterior access difficulty, and landscape restoration requirements. Homes requiring significant sod replacement, irrigation system repair, or hardscape restoration (patios, walkways) add $500-1,500 to final cost. Properties in the 30360 ZIP code with challenging access (fenced yards requiring gate removal, mature landscaping limiting equipment placement) may reach $8,000-9,000 for complex tunneling scenarios.

Warranty: Lifetime warranty on pipe repair work (new pipe section and connections), 1-year warranty on backfill settling (we return to add compacted soil if settling occurs beyond normal 1-2 inch subsidence), no warranty on landscaping (sod establishment depends on weather and