Volteco

Waterproofing the “Y-40” – The World’s Deepest Thermal Pool

The project in brief

Construction typology
Sports facility
Year
2013
Place
Montegrotto Terme – Veneto – Italy
Designer
Arch. Emanuele Boaretto
Products used
See all

In Montegrotto Terme (PD), under the visionary direction of architect Emanuele Boaretto, Y-40 The Deep Joy was born, inaugurated on 5 June 2014 and immediately entered into the Guinness World Records as the world’s deepest thermal pool, reaching 42.15 metres. Its impressive layout includes stepped levels at varying depths (from 1.3 m down to 42.15 m), submerged caves for technical training, and a striking 13-metre transparent underwater bridge.

IMG_3084

This extraordinary structure holds 4,300 m³ of thermal water maintained at a constant temperature between 32 and 34 °C, fed by a natural spring that emerges at 87 °C.

The waterproofing challenge

Building a pool of such depth and technological complexity poses significant waterproofing challenges.

Volteco responded with a range of reliable and innovative solutions, specifically designed to ensure durability, watertight performance, and long-term integrity. The products applied include:

  • AKTI-VO 201 – Hydro-expansive synthetic rubber mastic
  • AQUASCUD SYSTEM 420 – Two-component waterproofing compound
  • BI MORTAR PLASTER SEAL – Thick-layer fibre-reinforced waterproof plaster
  • FLEXOMIX 30 – Low elastic modulus cementitious premix
  • GARVO 3 and 5 – Reinforced rubber joint cover strips
  • PLASTIVO 250 – Flexible two-component waterproofing membrane
  • BI FLEX SYSTEM – TPE polymer elastic tape with epoxy adhesive
  • SPIDY 15 – Fast-setting waterproof mortar
  • VOLGRIP HP / VOLGRIP LH – Self-anchoring bentonite membranes (High-Performance and Light)
  • WT 102 – Hydro-expansive bentonite strip

Why this choice made the difference

  • Reliability and resistance: all selected products provide uncompromising water tightness, essential in a structure of this depth.
  • Flexibility and precision: solutions such as Flexomix 30 and Bi Flex System adapt to structural movement and variations, reducing the risk of cracking.
  • Speed of application: Spidy 15, with its fast-setting properties, allows targeted, precise interventions without slowing the construction schedule.
  • Complete protection: the Volgrip bentonite membranes and WT 102 strips ensure a continuous barrier against infiltration, even under extreme conditions.

Conclusion

The Y-40 pool is not only a symbol of depth and fascination, but also a showcase of engineering applied to construction excellence. Through careful product selection, Volteco has enabled the structure to maintain an exceptionally high technical and functional standard over time — safeguarding its integrity within one of the most iconic built environments in the world.

 

See the full reference: Waterproofing the “Y-40” – The World’s Deepest Thermal Pool

Products associated with the value project

AKTI-VO 201

Synthetic rubber hydro-expansive mastic.

AQUASCUD SYSTEM 420

Two-component waterproofing product.

BI MORTAR PLASTER SEAL

Fibre-reinforced waterproofing mortar for thick layer applications.

FLEXOMIX 30

Cement-based, ready-mixed compound with low modulus of elasticity.

GARVO 3 e 5

Joint-cover strip reinforced with rubber.

PLASTIVO 250

Two-component flexible waterproofing compound.

BI FLEX SYSTEM

Elastic tape based on TPE polymers and epoxy adhesive for gluing.

SPIDY 15

Quick-setting waterproof mortar.

VOLGRIP HP – High Performance

Bentonite waterproofing membrane, self-gripping to concrete, coupled with an MDPE membrane.

VOLGRIP LH – Light

Waterproofing bentonite membrane, self-gripping to concrete.

WT 102

Hydro-expansive bentonite curb.

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