As with shotcrete, gunite nozzle operators use a back and forth motion to place the material in the desired shape and thickness. Constructing pools and spas using gunite (dry mix) requires experienced personnel. It is critical to have sufficient-trained staff to place, carve, and finish the gunite structure.
When applied properly, the gunite technique can result in a stronger comprehensive strength than an installation completed with cast-in-place or shotcrete. The pounds per square inch strengths far exceed what would be required for a traditional backyard pool and spa.
Cementing it all together
Each and every project has a technique that is best suited to its design and engineering. For example, a rooftop pool would likely use the cast-in-place technique, where as a commercial lazy river would benefit from the shotcrete or gunite technique, or a combination of all three. In other situations, multiple techniques are used. The final decision on the vessel’s construction is based on multiple variables, such as cost, availability, and final design. Having the versatility to use more than one placement technique would benefit any company.
Peter Vamvakaris is the manager of operations at Pebble Tec Canada, Canada’s first appointed installer of Pebble Technology International line of pool finishes. He is a second generation pool finisher and an active member of the National Plasterers Council (NPC) with Genesis 3 gold member accreditation. He can be reached via e-mail at peter@pebbletec.ca.
