How Geography Can Impact Your Fiberglass Pool Installation

 Your soil plays a big part in the installation cost of your fiberglass pool

pool installation cost

Planning to get a new inground fiberglass pool is exciting, and there are so many choices to make. You will need to choose from a variety of fiberglass pool designs, sizes, colors and features like tanning ledges. You may even want to be a trendsetter and get the new beach entry or sunken living area fiberglass pools!

While you are making decisions, it’s important to identify any potentially hidden costs that you should ask your pool builder about. One thing that will definitely affect your inground pool installation is where you live. The soil that your house sits on may make your pool installer’s job a dream or a big challenge, and that may have an impact on your overall pool cost.


Rock is known for causing problems early in the installation process. Underground rock, such as limestone, is more prevalent in some areas and can play a big part in your inground pool installation. Excavating rock often requires specialized equipment to break the rock into manageable pieces so that it can be removed and hauled away. Many swimming pool contracts have a “rock clause” so be sure to read it carefully. Rock clauses usually state that the homeowner is required to pay for the expense of removing any rock from the project site.

Clay and Sand

Soils with a high clay content are “expansive soils.” This means that they have a high capacity to absorb moisture and can swell and contract with moisture. This type of soil must be replaced with a less absorptive fill soil during your pool installation because the likelihood of groundwater pressure under your pool increases, and it can damage your pool shell. If your soil is very sandy, it will also have to be amended to include some sturdier fill dirt, as shifting soil under your pool will also not provide a strong support system.

Thursday Pools’ Fiberglass Pool Geo-Anchoring System 

One of the best ways to avoid issues with your soil is to buy a Thursday Pools fiberglass pool. Thursday Pools has developed a patented system called the Geo-Anchoring System to help secure fiberglass pools during installation and protect them against groundwater pressure. The Geo-Anchoring System has revolutionized the fiberglass pool industry by providing the only solution that prevents wall movement or bulging. A specially formulated geo-textile material is infused into the pool wall during manufacturing, then rolled up and secured for delivery. During installation, it’s rolled out into the backfill and covered, thus anchoring the pool to the earth. As a result, the walls of the fiberglass pool will resist movement or bulging.

Ask Your Pool Builder 

Your pool builder will be familiar with the types of soil in your area and should be able to give you a good idea of what you might be up against once they start to dig. Just be sure to ask about any additional costs that might crop up once they’ve had a chance to assess your soil and build those into your pool finance budget as contingencies, just in case. If your project turns out to be an easier dig than they thought, you can use that money for fun stuff, like ledge loungers for your tanning ledge or other add-on goodies, like water features or specialty lighting.

About Thursday Pools 

Thursday Pools designs and manufactures the world’s most durable and elegantly crafted fiberglass pools. We are ISO 9001 certified, which means that fiberglass pool shells are made with the highest standards and from the best quality material available. We are also ISO 14001 certified, which means we are committed to environmental stewardship.

Our one-piece, inground fiberglass swimming pool manufacturing facility is based out of Fortville, Indiana. At Thursday Pools, we aspire to be the world’s most respected fiberglass pool manufacturer and to help our customers create a lifetime of memories with their family and friends. Our innovations, commitment to quality and beautiful designs set us apart. Thursday Pools is the creator of the world’s first sunken living room fiberglass pool, which will be available to order in 2020 and also the world’s first beach entry fiberglass pools, which are available in two designs, Grace and Sandal.