In section 5.3.3 it states to “force a maximum amount of grout in the joint.” In section 5.3.4 it says, “All joints are to be uniformly finished.” Part of the service we offer to mem- bers is technical support. We have in the past seen many instanc- es where uncut pebbled stones have inhibited the flow of water in showers even with properly sloped assemblies, which in turn leave small puddles behind the stone affecting the uniformity of grout color. Also these small puddled areas – when not properly and regularly cleaned – can encourage mold growth when organic materi- als from soaps and shampoos are added to them. This is a significant enough problem that I’ve heard the 1/4" per foot slope minimum requirements for shower floors may be changed to 1/2" per foot slope to alleviate some of these issues. Not filling the joints full as directed by the ANSI standards previously cited could increase these issues. – Robb Roderick, NTCA technical trainer ASK THE EXPERTS –––––––––––––––––––––––––––––––––––––––––––––––––––– Low grout joints in a pebble shower floor go against standards and guidelines and can lead to problems. (Photo of correctly-grouted pebbled floor courtesy of Stoneman Construction LLC). 26 TileLetter | June 2017