Shower Slope - What It Should Be and How to Make It

The primary function of the slope is to ensure effective drainage into the sewer system. Each shower can use tens of liters of water per minute, so it is essential that water is drained efficiently. If the shower slope is too shallow, water starts to pool inside the enclosure. This not only makes the shower uncomfortable to use and look unsightly, but also significantly increases humidity levels in the room. High humidity promotes the growth of mold and fungi, which is particularly dangerous in a bathroom. On the other hand, an excessively steep slope toward a linear drain can reduce comfort and put stress on the surface, weakening it over time and increasing the risk of cracks. How much slope is needed for a linear drain, and how should a linear drain be installed?

As a general rule, a shower enclosure with a floor drain should have a slope of 1.5% to 2.5%. This means that for every meter of the shower surface, the floor height should decrease by 1–2 cm. Such a slope in a tiled shower base is considered optimal. Depending on the type of drain, there are several common slope configurations: with a linear drain, the slope is one-directional; with a drain located near the wall, it is two-directional; and with a point drain, it is envelope-shaped, meaning that water flows from all sides. What slope should a shower tray drain have? In the case of a shower tray drain, the requirements are the same, i.e., the slope should be between 1.5% and 2%.

Among the various drain options, the linear drains are particularly popular. Showers without a tray often raise questions about the required slope. The absolute minimum slope is 1%, but specialists recommend that it fall within the range of 1.5%–2%. To calculate the required slope for a linear drain, it is sufficient to use a simple formula: divide the height difference by the length of the shower zone and multiply by 100%. How do you create a slope toward a linear drain?

Various types of shower enclosures are available, including traditional and walk-in models, so the slope will differ slightly in each case. How do you correctly create a shower slope? First of all, you need to determine the direction of the slope, which should be toward the drain. Next, the base is prepared by applying a leveling layer over a slightly inclined surface. To ensure that a shower with a floor drain effectively removes water, the slope must be checked with a spirit level. For precise slope formation, it is worth using a thin-layer screed. This will make it easier to lay shower tiles. Shower enclosures can also have a different type of slope. How do you make an envelope slope?

In this solution, also known as a point slope, water flows to the drain from all sides, making the surface resemble an envelope. To create it, first determine the point to which the water will flow, and then draw lines connecting the corners of the shower to the drain. The base is applied along these lines, maintaining a slope of 1–2%. The work is checked continuously with a spirit level. Finally, waterproofing and tiles are applied.

Creating slopes in a shower enclosure is not complicated, but it requires knowledge of basic principles and careful attention to each stage. This directly affects day-to-day use and cleaning of the shower enclosure. There are several key mistakes to avoid. First of all, there is the risk of creating a slope that is too small or too large. The former promotes puddles and mold growth, while the latter leads to difficulties in laying tiles and their cracking.

Another problem is creating an uneven slope, which creates areas where water tends to collect. This happens when measurements taken with a spirit level are inaccurate and the slope itself is not even.

Another important aspect is selecting appropriate materials, especially the base. All materials used must be waterproof and mechanically stable, as the shower base and drain are exposed to constant contact with water. When purchasing materials, it's best to stick to products specifically designed for bathroom use.