Cantilever Beam

Innovative design

Unparallelled Structural Confidence

A Smarter Structure - Proven Strength

In the 1960s, the founder Leif Zars, built his pool in Terrell Hills, an expansive soil condition area, using a common beam pool approach.

It was crushed and completely failed! The clay-filled soil expanded with enormous pressure on the pool, causing the failure. As an engineer, he took to solving the problem and has applied his solution to the Gary Pools Method since.

A diagram with the frequency of expansive soil in Texas with the high areas being in the cities of Dallas, Austin, San Antonio, Corpus Christi, Victoria, Houston and Beaumont.

Expansive Soil Conditions

Central San Antonio and areas such as Alamo Heights, Terrell Hills, and around IH35 towards New Braunfels suffer from some of the worst Texas soil conditions.

Unfortunately, home foundations repair companies are very busy in these areas. If soil in these area is tough on a foundation, imagine how tough it is on a pools structure!

An Engineered Solution

Many structural changes were made, the most significant being the addition of the cantilever beam. By elongating the beam, structural rigidity was increased by over 800%. The elongated beam doubles as an integrated walkway, adding value to the project. In a sense, you get structural strength that doubles as a walkway around the pool.

In addition, the coping and tile no longer fail due to adjacent decking movement. The cantilever insulates the coping and tile from any stresses applied by surrounding structures.

A diagram of the cantilever structure.


  • Withstands 250,560 lbs. of water pressure
  • Withstands 501,120 lbs. of Earth’s pressure
  • 8x the strength of traditional beam structures
  • Doubles as a walkway
  • Insulates tile and coping from adjacent deck movement
A diagram of the typical beam structure.


  • Withstands 52,200 lbs. of water pressure
  • Withstands 62,640 lbs. of Earth’s pressure
  • Not strong enough for expansive soils
  • Beam is primarily underground, providing no walkway
  • If adjacent deck moves coping failure is much more likely
A diagram of the cantilever beam.

Cantilever Patent

Truly pioneering the swimming pool construction process, Gary Pools’ innovative solution to extreme expansive soil conditions can be seen via the U.S. Patent filed in 1963!


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