When is it best to use sanded grout in tiling?

Sanded grout is ideal for gaps larger than 1/4" because it contains sand particles that help to provide additional strength and stability to the grout joint. The sand improves bonding and helps to prevent cracking or shrinking, which is especially important in wider joints. When the gaps are larger, the added texture of the sand ensures that the grout adheres well to the tile edges and helps fill the space more effectively.

Using sanded grout for gaps larger than 1/4" helps to ensure a more durable and resilient finish, as opposed to using unsanded grout, which is better suited for smaller joints (typically 1/8" or narrower). Unsanded grout does not have the same structural integrity and is more prone to cracking when used in wider gaps due to its lack of the reinforcing sand particles. Thus, choosing sanded grout for gaps larger than 1/4" aligns with industry standards for optimal tiling practices.