Pool Construction Has Evolved — Here’s What Changed
For most of the last 50 years, building a custom pool meant one thing: gunite. You’d excavate a hole, build a rebar cage, spray concrete over it, and finish the surface with plaster. It works — but it’s slow, labor-intensive, and comes with some real long-term drawbacks.
Structural foam pool construction is a fundamentally different approach, and it’s gaining serious traction with both builders and homeowners. Here’s what it is, how it works, and why it matters.
What Is a Structural Foam Pool?
A structural foam pool uses panels made from expanded polystyrene (EPS) — a dense, engineered foam — as the building blocks for the pool shell. Think of it like insulated concrete forms (ICFs) that are used in modern home construction, but purpose-built for pools.
The process works like this:
- Excavation — The pool shape is dug out, same as any pool
- Panel assembly — Pre-cut EPS panels are assembled to form the pool walls and floor structure. The panels interlock and can be shaped to any custom design
- Steel reinforcement — Rebar is placed inside the panel forms for structural strength
- Concrete pour — Concrete is poured into the panel cavities, creating a steel-reinforced concrete core encased in insulating foam
- Finishing — The interior surface gets a marble-based coating that’s both durable and aesthetically premium
The result is a pool that’s structurally as strong as (or stronger than) traditional gunite, but with built-in insulation on every surface and a finish that lasts decades longer than standard plaster.
Why Builders Are Making the Switch
Built-In Insulation Changes Everything
This is the biggest deal. Traditional gunite and fiberglass pools have zero insulation. The concrete or fiberglass shell sits directly against the earth, and heat transfers freely between your pool water and the ground.
In Utah, where nighttime temperatures can drop 30–40 degrees below daytime highs — and where we get legitimate freezing conditions for 4+ months — this matters enormously. An uninsulated pool loses heat rapidly, which means:
- Your heater runs constantly during shoulder seasons (April–May, September–October)
- Monthly gas or electric bills spike during swim season
- The pool is basically unusable without constant heating for half the year
A structural foam pool is insulated on all sides by the EPS panels. Heat stays in the water instead of bleeding into the ground. Homeowners consistently report 30–50% lower heating costs compared to uninsulated pools of the same size. In Utah’s climate, that adds up to thousands of dollars every year.
Faster Build Timelines
A gunite pool in Utah typically takes 3 to 6 months from dig to swim. The concrete curing process alone eats up weeks, and you’re at the mercy of weather delays.
Structural foam panels go up in days, not weeks. The concrete pour is smaller and cures faster because it’s protected by the insulating panels. From excavation to completion, most structural foam pools are finished in 6 to 10 weeks — cutting the timeline nearly in half.
Better Performance on Difficult Lots
Utah has no shortage of challenging pool sites: hillside lots in Draper, sloped backyards in Alpine, rocky terrain in Park City, tight-access properties in older Salt Lake neighborhoods. Structural foam panels are lighter than gunite construction, more modular, and easier to work with in confined spaces.
For sloped lots that also need retaining walls, structural foam can be used for both the pool and the walls — simplifying the project and reducing the number of trades on site.
Long-Term Durability
Standard pool plaster needs resurfacing every 8 to 12 years, at a cost of $5,000–$15,000+. The marble-clad finish used in structural foam pools doesn’t degrade the same way — it maintains its appearance and structural integrity for decades.
The EPS material itself doesn’t rot, absorb water, or break down over time. Combined with the steel-reinforced concrete core, the system carries a 40+ year structural warranty.
Freeze-Thaw Resilience
Utah’s freeze-thaw cycles are brutal on pool structures. Water seeps into tiny concrete pores, freezes, expands, and gradually creates cracks. Over years, this is what causes the surface cracking and structural issues common in older gunite pools.
The EPS insulation layer acts as a thermal buffer, keeping the concrete core at a more stable temperature and reducing the freeze-thaw stress that causes cracking. It’s a material advantage that’s especially relevant in markets like ours.
Is It More Expensive?
Upfront, a structural foam pool is comparable to gunite — sometimes slightly more, sometimes less, depending on the project. It’s typically more than fiberglass (but fiberglass can’t match the customization).
Where the math really works in structural foam’s favor is total cost of ownership:
- Lower heating costs every year (insulation)
- No plaster resurfacing every decade ($5,000–$15,000 saved)
- Less chemical use (the marble finish is less porous than plaster)
- Longer structural life before any major repairs
Over a 20-year period, the total cost of owning a structural foam pool is typically $20,000–$40,000 less than a comparable gunite pool — even if the upfront price was similar.
Is This Just Marketing?
Fair question. EPS construction isn’t brand new — it’s been used in European pool construction for years and has an established track record. In the U.S., it’s been growing steadily as more builders see the performance advantages firsthand.
At Advantage Custom Pools, we switched to structural foam because we got tired of callbacks. We got tired of telling homeowners that their plaster needed resurfacing after 10 years. We got tired of watching heating bills eat into the enjoyment of owning a pool. The material is simply better for Utah’s conditions.
See What It Would Cost for Your Project
Curious what a structural foam pool would run for your specific backyard? Our free budget calculator gives you a personalized estimate based on your pool size, features, and lot conditions — takes about 3 minutes.
Or if you’d rather just talk to someone, get in touch with us here. No pressure, no sales pitch — just straight answers about what your project would look like.
