While browsing one of the many flooring installation communities on Facebook, I came across a nightmare of a tile job where the homeowner had decided to roll up their sleeves and do the job themselves. They not only hadn’t bothered to prep the concrete first; they simply slathered on thin set until it was pushing up through the joints and drying all over the top of the tile.
Spacers? This homeowner had apparently never heard of them—the wood-look planks were simply squeezed against each other haphazardly in an approximation of a brick pattern. The excess thin set at the edges of the installation didn’t even look like it had been troweled—more like applied with a shovel blade, with all kinds of strange bumps, waves and valleys left in the mortar as it had dried.