deliver them to the jobsite. That required Schreffler to build a map to clarify where the design was going – it had to be laid out and put back together like a puzzle. Compounding the difficulty was the slope of the pool – it sloped from the shallow to deep end on a radi- used arc rather than on a straight plane, so it was a perfectly flat curved arc: an intersecting plane that was flat in one direction and arched in the other. The bottom of the pool needed to be prepped first with ARDEX AM100 rendering mortar with a radius established based on the arc; then an installer and an apprentice QUALIFIED LABOR ––––––––––––––––––––––––––––––––––––––––––––––––– ^ The crew, with Schreffler, three Certified Tile Installers and two apprentices, started early in the day while it was cool to keep the ARDEX X77 thinset viable. ^ Compounding the difficulty was the slope of the pool – it sloped from the shallow to deep end on a radiused arc rather than on a straight plane. ^ The team assembled the pieces in one four-hour session to be sure all the pieces fit perfectly. 48 TileLetter | September 2018