Curbless Shower: Build Up, Not Down
Construct a curbless shower quickly and at less cost than the traditional method.
Synopsis: Building a curbless shower typically requires cutting into the floor joists to create a slope to the drain. The joists then have to be reinforced and a new subfloor installed. In this article, contractor Jake Bruton describes how to build a curbless shower with a linear drain positioned at the shower entrance. This allows the shower to be built on top of the existing subfloor and simplifies the project.
Combining elegance and practicality, a tiled shower with a curbless entry is hard not to appreciate. I have installed many of these showers by employing an atypical method that eliminates having to cut down into the joists in order to achieve the proper slope. My method—a completely different approach—saves time and money.
To install a curbless shower, a carpenter typically would remove the subfloor and cut up to 3 in. off the top of the joists to accommodate a prefab tray, such as in a Schluter shower system, that slopes backward. The joists, in turn, would then be reinforced to regain their structural integrity. By installing a linear drain at the shower’s entrance, however, I am able to build up instead of down.
During the bidding process, I check the span of the floor joists, identify the subfloor material, and determine the subfloor’s thickness. By following the standard L/360 load calculation, I ascertain if a Schluter prefab tray can be installed directly over the existing subfloor. This is crucial because if another layer of subfloor is needed for reinforcement, the tray will be too high for a curbless entry.
Cost reductions of approximately $1000 can be expected from savings in framing materials and in the elimination of what would typically be a day of labor for two workers.
Consider these components of the project:
Floor: The difference in…