Does the bathroom niche need to be coated with silicone sealant for waterproof sealing?

There are multiple factors that need to be comprehensively considered when it comes to whether the bathroom niche needs to be coated with silicone sealant for waterproof sealing.

Firstly, silicone sealant does have excellent waterproof performance and can effectively prevent moisture penetration. However, for this special area of the niche, we also need to consider other factors.
Niches are usually located on the walls of bathrooms for storage or decorative purposes. Due to its depth and position, it itself has a certain waterproof ability, as water is not easily in direct contact with the inside of the niche. Therefore, for general bathroom environments, applying silicone sealant may not be necessary if there is no special risk of water infiltration (such as near bathtubs or shower areas).
However, if the location of the niche makes it susceptible to moisture, or if you want to further improve its waterproof performance, using silicone sealant for waterproof sealing may be a good choice. This can further prevent moisture from entering the interior of the niche and protect the contents from moisture and mold.

In addition, if you plan to install water pipes or drainage facilities in niches, waterproof sealing is even more important. The connection areas of these facilities may have potential water seepage risks, so using silicone sealant for sealing can help prevent this situation from occurring.

In summary, the need to apply silicone sealant for waterproof sealing of bathroom niches depends on the specific situation. If your niche is susceptible to moisture or if you plan to install plumbing and other facilities, using silicone sealant for waterproof sealing may be beneficial. But if the niche location is relatively dry and there are no other special requirements, then waterproof sealing may not be necessary. It is best to consult a professional architect or engineer for more specific advice.