The actual grout joint size shall be at least three times the actual variation of facial dimensions of the tile supplied. Nominal centerline of all joints shall be straight with due allowances for hand-molded or rustic tiles. The grout joint width shall be increased over the minimum requirement by the amount of edge warpage on the longest edge of the actual tiles being installed.
Of necessity, in any installation, some grout joints will be less and some more than the average minimum dimension to accommodate the specific tiles being installed. The architect asked the installer where he found this information and how he knew it so well.
The installer showed the architect the portion the ANSI book containing that standard and told him that he became aware of this and many other aspects of the industry standards through his studies in preparation for the ACT certification tests. The architect reviewed the ANSI listing and agreed that the specifications would be modified to follow the standard that the installer had described.
The tile was installed successfully, and everyone involved was satisfied with the end result. The owner of the tile company, who was absent through this process, is convinced that had they installed the tile as originally specified, the job would have been rejected due to edge lippage, requiring it to be removed and replaced.
Please note that most of the answers to the questions below are contained in the above article, but I have included the answers for each question for clarity. The questions fall into the following categories:. I read the specs. That conflicts with what was said in the Standard.
I would like to know if the manufactures specs. I just had a complete remodel of my bathroom- Contractors are using 12 x 24 porcelain tiles. This is my first home at 49 yrs old and will be my retirement home. The grout joint width shall be increased over the minimum requirement by the amount of edge warpage on the longest edge of the tile being installed.
Of necessity, in any installation, some grout joints will be less and some more than the average minimum dimension to accommodate the specific tile being installed. Lippage is a condition when one edge of a tile is higher than the adjacent tile, giving the finished surface an uneven appearance. Install tile without jagged or flaked chipped edges. Is it acceptable for a contractor to chip any existing tiles when doing grout work per industry standards?
Install tile without jagged or flaked edges. Reworking or regrouting an existing tile installation is very difficult and problematic. In these instances, extra tiles of the same dye lot or run as the floor to be repaired should be on hand before attempting the repair. I am having my house renovated. One of the tasks is laying 24" x 24" porcelain tiles. These were formed when he lay the wire mesh and then poured the cement on top. But the cement doesn't seem to cover the mesh uniformly, especially where the two meshes join.
I told the contractor that the floor is not level but he says that is ok and it will be taken care of by the mortar. But I am not comfortable with that after reading various articles on tile laying requirements.
He insists his installer knows what he is doing and isn't prepared to do any changes. He is implying that I am questioning his installer's competency. How do I convince him to smooth out these bumps? I cannot ask him to not continue as the tile installation is part of the whole renovation.
Any ideas are greatly appreciated. Additionally, thin set or large and heavy tile mortars are not intended to be used in truing or leveling the work of others. Hi Scott, thank you for sharing your wealth of knowledge in the world of tiles. I encountered an issue with my newly installed wall tiles. They are large format 12 by 24 and got installed improperly by the contractor.
Now I am seeing crack and bulge! I showed your article and ANSI standard to him, but he refused to accept the responsibility. Any advice? Sindy, You did not indicate what the reason was for the tiles being installed improperly, but they should not be cracked or bulged.
Use of crack-isolation systems prevent migration of shrinkage cracks from the substrate to the tile. These membranes are available as sheets, roller or trowel-applied liquids and as one-step mortars.
ANSI standards call for these latex-modified performance mortars to be back-buttered to the tile and combed over the substrate in parallel ridges. The tile is then pressed in perpendicular to the comb marks to achieve full coverage. When installing large formats on walls, use non-sag mortars, spacers or other temporary holding devices to prevent slippage.
Consult your distributor representatives and your installation professionals to obtain project-specific recommendations on joint size, layout, crack-isolation systems and expansion joints. Large rectangles, for example, normally exhibit some warpage even while conforming to ANSI standards.
To minimize lippage an architect would specify a stack bond pattern rather than a running bond — or increase the joint size. This is intended to be a general introduction to large-format tile specification and installation.
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