![]() I explained movement joints are required in all residential and commercial tile installations. He thought movement joints were only required on commercial work. When I asked if he had a perimeter joint (along the walls and cabinets) and movement joints in the body of the floor, he said no, since it was a residential job. I discovered there were two skylights in the ceiling and large windows along the southwest side of the house, resulting in large amounts of sunlight heating the floor causing it to expand. Subsequently, he called me to determine the cause of the tenting. The installer went to view the bulge in the floor, which is known as tenting. Several months later, his friend called to say that his kitchen now had a large hump in the middle of the floor. During a slow time in his work schedule, a friend asked him to install his kitchen floor of approximately 200 sq. ![]() He solely installed tile on large commercial projects where he installed movement joints as shown on the plans and specifications. Several years ago, I received a call from tile contractor, who I knew personally. These two statements clearly tell the tile contractor that movement joints are a must. Image #2 shows the sad results of tile exposed to direct sunlight without the benefit of movement joints.
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