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have plenty of experience with the installation of penny round tile and have processed through many issues regarding sheeting and wall-washing concerns. What we are in search of is some guideline or criteria that we can show ownership so they can assess their expectations more in line with industry standards. Any assis- tance you can share with us would be greatly appreciated. ANSWER 1 You certainly seem to understand all of the issues and have the experi- ence to install penny round mosaics which are difficult at best. The tiles you have been provided appear to have an especially flimsy mesh back- ing and the inconsistent spacing and water-soluble adhesive is not going to help matters. Obviously a proper substrate that meets minimum deflection and flat- ness requirements and using the cor- rect mortar and troweling method to achieve a minimum of 80 coverage on each tile with no squeeze-through will be critical. Im almost thinking that to have the manufacturer send their installer to show you how its done for the dura- tion of the project might be a way to bring the manufacturer on board with some liability for the installation. Has all of the tile been manufac- tured and delivered Have you dis- cussed the matter with the owner and architect Other than what Katelyn has pro- vided below and the general work- manship requirements found in the TCNA Handbook and ANSI stan- dards I am not immediately coming up with anything that I can send you. I will check with my colleagues and get back to you. Perhaps the best approach will be to hire a recognized consultant to come in and serve as a third party to view the tiles and installation area and scope of work and provide you with a written opinion. Mark Heinlein NTCA technical trainer ANSWER 2 From a third party testing labs per- spective there is no way to measure mounting variation of penny round mounted ceramic mosaic tiles. The mounting variation test methods for mounted tile are only performed on square mosaic tiles. Ive includ- ed an excerpt from ANSI A137.1 Specification for Ceramic Tile below 9.5 Test Method for Mounting Variations 9.5.1 This method is only valid for mosaic tiles with the following char- acteristics Nominally square Nominal sizes of 1 inch x 1 inch 25.4 mm x 25.4 mm to 3 inches x 3 inches 76.2 mm x 76.2 mm With straight edges Our lab does not provide reports based on expert opinion so you may need to hire an independent con- sultant if that is something you are looking for. Please let me know if you are interested in an independent consultant and Id be happy to send you the contact information for one. Katelyn Simpson TCNA laboratory manager ASK THE EXPERTS 24 TileLetter May 2016