The Gunite Pool Construction Process: A Step-by-Step Guide for Middle Tennessee Homeowners

Imagine walking into your Franklin backyard on a Tuesday morning to find a massive excavator positioned to tear into your lawn. It's a sight that brings a mix of excitement and genuine anticipation about the transformation ahead. This guide explains every milestone in detail — from the first scoop of Tennessee clay to the moment you take your first dip in your Nashville-area oasis.

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Phase 1: Design, Permitting, and Site Preparation

Your dream backyard starts long before the first shovel hits the dirt. We use advanced 3D design software to visualize how your pool sits against the rolling hills of Franklin or the limestone-rich soil of Mt. Juliet, ensuring we protect your home's foundation while maximizing your property's natural beauty.

Local Permits and HOA Approvals

Building codes in Middle Tennessee vary significantly by municipality:

• Davidson County — pool setbacks typically require a 10-foot distance from property lines
• Wilson County — regulations often change based on specific lot size and zoning
• Permit timeline — administrative process typically takes 4–8 weeks in the Nashville metro area
• HOA reviews — we provide detailed site plans and material samples to demonstrate how the project maintains community aesthetic standards

Layout and Forms

Once permits are in hand, we use wooden form boards to create a physical outline of your pool's footprint directly on your lawn — so you can see the exact scale and placement before any excavation begins. We set the "benchmark" elevation, a fixed reference point ensuring the pool sits at the perfect height to facilitate proper water runoff away from your home.

We also coordinate the 811 utility mark-out during this time — the mandatory safety check that identifies underground gas, water, and electrical lines before the dig begins.

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Phase 2: Excavation and the "Big Dig"

After layout is marked and approved, heavy machinery moves in to remove hundreds of cubic yards of dirt. Once the bulk of the earth is moved, our crew performs meticulous hand-trimming — using shovels and picks to refine the walls and floor to match your design's exact specifications. Rough plumbing (main drains and skimmer lines) is set during this phase as well.

Navigating Middle Tennessee Soil Conditions

Building in Lebanon or Brentwood often means dealing with the region's dense limestone shelf. If rock or limestone is encountered during excavation, specialized equipment may be required, which can affect the excavation process. We ensure the ground is stable and properly graded to prevent future shifting.

Structural Steel Rebar Reinforcement

Once the hole is shaped, we build the "skeleton" of your pool:

• High-tensile steel rebar installed in a grid pattern across the entire floor and walls
• Concrete "chairs" hold the steel at a specific distance from the dirt, ensuring the gunite fully encases the metal
• This unified structure withstands the immense weight of the water and provides the structural integrity behind our long-term shell warranties

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Phase 3: The Gunite Application and Curing Process

This is the day your backyard stops looking like a construction site and starts looking like a pool. Gunite is a specialized dry-mix concrete that stays in a hopper until pushed through a high-velocity nozzle — mixed with water at the very last second as it sprays, creating a dense, incredibly strong shell. Custom benches, steps, and sun shelves take shape in a matter of hours.

Gunite vs. Shotcrete: Why We Use Gunite

We choose gunite over shotcrete because the dry-mix process allows our craftsmen to adjust the water content on the fly. This precision enables us to sculpt intricate features like zero-entry beach entries or deep-end swim-outs with better accuracy than wet-mix shotcrete. In Middle Tennessee's climate — where temperatures can swing 40 degrees in a single week — gunite provides higher compressive strength, essential for resisting the expansion and contraction of our regional clay soils.

The 28-Day Curing Period

While the application is fast, the curing is a marathon. A standard gunite shell requires a 28-day period to reach its full design strength through a chemical reaction called hydration.

The Seven-Day Watering Ritual — your primary responsibility as a homeowner:

1. Frequency — spray down the entire gunite shell at least twice daily with a garden hose
2. Coverage — start at the top of the walls and let water run down to the floor; every square inch must be dark and wet
3. TN Heat Protocol — during a typical 90°F Tennessee July, increase to three times daily to combat rapid evaporation
4. Monitoring — water ponding in the deep end is normal and helps the floor cure evenly

During the first seven days, the concrete gains approximately 70% of its total strength. Small "crazing" lines on the surface are superficial and expected — consistent hydration prevents these from becoming structural issues. Our team checks in regularly during the full 28-day window before moving to tiling and coping.

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Phase 4: Plumbing, Tile, and Coping Installation

Once the shell cures, we finalize the plumbing lines and set the equipment pad. Every line undergoes a rigorous pressure test at 35–40 PSI for a minimum of 24 hours to guarantee a leak-free build before any aesthetic work begins.

Selecting Your Finish Materials

Waterline tile serves a dual purpose — a vital waterproof seal where water meets air, and a design statement. For 2026, Franklin and Brentwood homeowners are gravitating toward larger-format porcelain tiles and iridescent glass mosaics.

Coping options:

• Natural travertine — remains a top choice; stays 20% cooler underfoot than darker materials during hot July afternoons
• Pre-cast concrete — sleek, modern lines at a lower price point

Electrical and Equipment Setup

• Variable-speed pumps — can reduce energy consumption compared with older single-speed equipment by adjusting operation to the needs of the pool
• Salt-chlorine generators or UV systems — gentler swimming experience for families
• Full automation — manage water temperature, LED lighting colors, water features, spa jets, and chemical monitoring from your smartphone

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Phase 5: Interior Finish, Filling, and Startup

The final phase transforms a structural shell into a vibrant, waterproof oasis.

Interior finish options:

• Traditional white plaster — classic look, most affordable
• Quartz aggregates — enhanced durability and stain resistance
• Premium pebble finishes — known for their durability and natural appearance

The "Big Fill" — Critical Timing Rules

Once the finish is applied, the "Big Fill" begins immediately. This is a critical moment where timing is everything:

• You must keep the water running continuously until it reaches the middle of the waterline tile
• If water flow stops before the pool is full, it leaves a permanent "bathtub ring" or tide mark on the new plaster
• Depending on your home's water pressure and pool gallonage, this process takes 24–48 hours

The 30-Day Break-In Period

Your pool requires a 30-day break-in period for the finish to harden properly:

• First 14 days — brush pool walls and floor twice daily to remove plaster dust and prevent scaling
• Wait 30 days before turning on the pool heater or salt chlorine generator — introducing high heat or salt too early causes permanent damage to the curing material
• Swim timeline — you can typically dive in 7–10 days after the pool is filled and chemicals are balanced

Pool School Handover

Before we hand over the keys to your new backyard, a Marlin Exteriors expert hosts a "Pool School" session — walking you through every component of your equipment pad, showing you how to test your water, and explaining the filtration cycles. We want you to feel like a confident pro before your first swim.

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Safety Requirements

Applicable local building codes and the International Swimming Pool and Spa Code require a compliant safety barrier throughout the construction process. We install temporary orange safety fencing as soon as excavation begins. Before the final inspection, you'll need a permanent barrier with self-closing, self-latching gates to meet all local safety regulations and insurance requirements.

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Frequently Asked Questions

How long does the gunite pool construction process take in Nashville? Typically 8–12 weeks from initial excavation to final plastering, accounting for the 28-day curing period. About 15% of projects face delays due to Middle Tennessee's unpredictable spring rain.

Can you build a gunite pool in Tennessee during winter? Yes — provided the ground isn't frozen and temperatures remain above 40°F during the pour. Starting in January or February is a smart strategy to ensure your pool is finished by the first warm days of May.

What happens if you hit rock during excavation? If rock or limestone is encountered, we transition from standard buckets to hydraulic hammers or "ram hoes." Rock conditions are not uncommon in Middle Tennessee, and we identify them early and work efficiently to keep the project on schedule.

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Ready to start your custom gunite build? Contact Marlin Exteriors for a free consultation — we'll walk your property, assess your soil conditions, and give you a realistic timeline and budget before the first shovel hits the ground.