The biggest difference between pool types isn’t the water or the filter. It’s how the basin itself gets built. Each style has distinct pros and cons. You need to pick the right one before you dig.
Above-Ground Pool Kits and Assembly
Above-ground pools cost the least to build. They are also the easiest to assemble. Most come as prefabricated kits. An amateur can put these together. Professionals handle most installs though.
The process starts by leveling the ground. You need a flat surface. Then you assemble a perimeter track. This supports the outer wall. Walls are metal, plastic, or wood.
Next comes the sand. You spread it in the pool area. Lay the plumbing under the sand. Secure the vinyl liner over the walls. Fill the pool with water. Smooth the liner. Fasten it into place.
Hook up the pump and filter system. The pool is ready.
There are downsides. These pools are less durable. They look less attractive than built-in designs. They are not permanent. But that flexibility is useful. You can disassemble and move the unit.
Fiberglass Pool Installation
Fiberglass pools use reinforced plastic. The shape is molded in a factory. This creates a one-piece basin.
Installation is straightforward. Crews dig a hole the exact size of the shell. They lay the plumbing first. Add a sand filler layer.
Then they lower the preformed structure into the hole. Level the pool carefully. Hook up all plumbing lines. Backfill the surrounding area.
Most fiberglass pools get a concrete deck. It looks finished. It feels permanent.
Vinyl-Lined In-Ground Pools
These look like conventional in-ground pools. Structurally, they mimic above-ground designs.
A crew digs a hole. They assemble a frame wall. Materials are metal, plastic, or wood. Sand goes on the bottom. It creates a smooth base.
The vinyl liner attaches to the structural wall. This keeps it taut. It protects the frame.
Cost is lower than other in-ground options. Durability suffers slightly. The liner wears out. Expect to replace it every ten years. That adds to long-term costs.
Gunite Pool Construction Details
Gunite pools dominate much of the United States. They are the most popular design. Why? Custom shapes. Durability.
Construction starts with digging. Plumbing goes in next. Then comes the framework. You use 3/8-inch steel reinforcing rods. These are called rebar.
Space the rods about ten inches apart. Secure them with wire. The grid holds everything together.
Then spray the gunite. This is cement and sand mixed with water. The sprayer mixes dry mix with water right before application. It creates wet concrete.
The crew trowels the surface. It needs a week to cure. Then apply a finish. Plaster is the standard choice. It’s cement and marble sand.
Some prefer special concrete paint. Others use tile. Exposed aggregate works too. Fiberglass finishes are possible.
Gunite pools are highly durable. They handle any shape or size. Shotcrete pools work similarly. They are cousins in construction.
Poured-Concrete and Masonry Options
Poured-concrete pools are similar to gunite. They are harder to build. Instead of spraying, you pour concrete.
Wooden forms hold the wet concrete. This method takes longer. It requires more labor.
Gunite methods have mostly replaced poured concrete. It’s faster. It’s more flexible.
Masonry block pools use concrete blocks for walls. They are less common now. They require precise alignment.
Why Pools Float and Need Hydrostatic Valves
An in-ground pool acts like a boat. It can float in ground water.
When a pool is empty, ground water pressure pushes up. It can lift the structure. This causes damage.
That’s why pools stay filled. Water inside balances the pressure outside. Equal pressure on each side prevents floating.
Modern pools include a hydrostatic valve. It sits near the main drain. It guards against ground water damage.
If ground pressure gets too high, the valve activates. A small float pushes up. The valve opens.
Ground water flows in. It equalizes the pressure. The pool stays put.
This safety feature is critical. Without it, an empty pool can burst its walls. Fill it up. Keep the pressure balanced.
Materials and Tools for DIY Pool Builders
If you tackle an above-ground kit, you need basic tools. A level is essential. You need a shovel for the sand. A wrench set for the plumbing.
Safety gear matters. Wear gloves. Eye protection helps when mixing chemicals later.
For in-ground projects, skip the DIY unless you’re experienced. The rebar work requires precision. The gunite spray needs professional equipment.
Know your limits. A misaligned liner leaks. A cracked gunite shell fails.
Which Pool Style Fits Your Project?
Cost matters. Above-ground wins on price. Fiberglass is mid-range. Gunite is expensive but lasts decades.
Maintenance changes too. Vinyl liners need replacement. Gunite lasts longer but needs resurfacing.
Think about longevity. Above-ground pools move. In-ground pools stay.
Decide based on your yard. Digging is hard in rocky soil. Flat yards suit above-ground setups.
Start with the basin. Get the shape right. Then worry about the water. The plumbing keeps it clean. The structure keeps it standing.
One thing’s for sure. The water will be cold in November.
