What is the best way to handle a situation with a general contractor (GC) on a job I am just starting? I remember from the NTCA Symposium you had some good points on how to deal with incorrect specs and GC’s.
It is on above-ground concrete (steel framing and decking) with 1/4˝ deep saw-cut joints cut every 10’ or so. I recommend a full coverage membrane installation over the saw-cut joints; GC wants to go partial to save money. Tile will be 16˝x32˝ porcelain.
This is a good question, and begs some questions from my end. Do you want to use an anti-fracture membrane so you can offset movement joints away from their current positions? Are you hoping to be able to eliminate some of the joints by using the membrane? Is this installation a running bond or is it a square grid pattern?
There is new industry language re: above-ground concrete that says you should revert to the more stringent 10´ to 12´ maximum distance between movement joints, so maybe your saw-cut joints should just be followed up through the tile. There’s also language that says you should never cover any type of construction joint, including saw-cut joints. Any joints in the substrate should follow up directly through the tilework with a soft/movement joint above. If you decide to offset or ignore these joints, you will definitely be taking a large risk.
I took a firm stance after a couple of failures. I gave documentation showing that soft joints were industry requirements, and tried to educate the owner, design pro or GC that the tilework needed room to move. If we came to loggerheads on the issue, I would not proceed until I had direction, IN WRITING, to do the tile installation against industry and my standards. But realize that even with such a document, you are still at risk. In the event of a failure, the court will rule against you saying that as the professional you should have known better.
– Michael Whistler, NTCA Symposium presenter