Shotcrete vs Fiberglass Pools in Colorado: Which Is Right for You?
We build both, so we have no reason to push you toward one. The right answer depends on your lot, your design goals and how quickly you want to swim. Here is how shotcrete and fiberglass compare specifically in Colorado's climate.
Design freedom
Shotcrete wins outright. Because the shell is sprayed over rebar formed to your plan, there is no limit on shape, depth, floating steps, tanning ledges, bar stools, raised spas or vanishing edges. On sloped foothill lots in Evergreen or Indian Hills, a shotcrete shell can be engineered to the terrain.
Fiberglass shells come in fixed molds. The selection is broad and the modern designs are excellent, but you are choosing from a catalog rather than drawing from scratch.
Timeline
Fiberglass is faster. Once permits are in hand and the site is prepped, the shell is set in a day and the remaining work is plumbing, equipment and decking. Shotcrete takes longer because the shell is built, cured and finished on site.
In a state where the swim season is short, that difference matters. If you are starting in spring and want to swim the same summer, fiberglass is often the practical answer.
Freeze-thaw and Colorado durability
Both perform well here when built correctly. Shotcrete shells are steel-reinforced concrete and extremely strong; the details that matter in freeze-thaw are proper engineering, drainage and a correctly executed winterization each fall.
Fiberglass shells flex slightly, which is an advantage in expansive clay soils common across the Front Range. Their gelcoat surface is also non-porous, which resists staining and scaling from Colorado's hard water.
Maintenance and surface
Fiberglass gelcoat is smooth and non-porous, so it typically needs fewer chemicals and no resurfacing. Shotcrete interiors — plaster, quartz or pebble — are refinished periodically, and the timing depends on water chemistry and use.
How to choose
A simple way to decide:
- Choose shotcrete if you want a fully custom shape, an infinity edge, an integrated spa, unusual depth, or a design built to a sloped lot.
- Choose fiberglass if you want a faster install, a predictable budget, a low-maintenance surface, and a shape from a strong catalog works for your yard.
- Either way, insist on proper engineering, permitting and drainage — that is what determines how the pool ages in Colorado.
Frequently asked questions
- Is shotcrete the same as gunite?
- Nearly. Both are steel-reinforced sprayed concrete. Gunite is a dry mix hydrated at the nozzle; shotcrete arrives as wet ready-mix. The finished shell is comparable and many Denver builders use the terms interchangeably.
- Do fiberglass pools crack in Colorado's freeze-thaw cycles?
- Properly installed and winterized fiberglass pools handle Colorado winters well. The shell flexes rather than resisting soil movement, and correct backfill, drainage and closing are what prevent problems.
- Which lasts longer?
- Both can last decades. A shotcrete shell is essentially permanent but needs periodic interior refinishing; a fiberglass shell's gelcoat surface avoids refinishing but the shape cannot be changed later.
Planning a pool or pergola in Littleton or the Front Range?
We handle design, engineering, permitting and the build — start with a no-pressure consultation.