If hydroxypropyl methylcellulose (HPMC) is not used during the process of tiling, the following issues may arise:

Reduced adhesion: HPMC can enhance the adhesion of tile adhesive, allowing tiles to tightly adhere to walls. If HPMC is not added, the adhesion of the tile adhesive may be insufficient, leading to the tiles being prone to detachment during use.

Reduced construction performance: HPMC can improve the construction performance of ceramic tile adhesive, making it easier to operate. Ceramic tile adhesive without HPMC may have poor fluidity and be difficult to apply evenly, thereby increasing the difficulty of construction.

Insufficient water retention: HPMC has excellent water retention performance, which can prevent premature evaporation of moisture in wet mortar or absorption by the base layer. If there is no HPMC, the water retention of ceramic tile adhesive may be affected, leading to premature loss of moisture in the mortar, thereby affecting its mechanical properties and curing effect.

Reduced anti sagging performance: HPMC can improve the anti sagging performance of mortar, ensuring that tiles can firmly adhere to walls. Tile adhesive without HPMC may perform poorly in this regard, leading to sagging or displacement of tiles during the bonding process.

In summary, hydroxypropyl methylcellulose plays a crucial role in the process of tiling. Not adding HPMC may lead to reduced adhesion, decreased construction performance, insufficient water retention, and weakened anti sagging performance of ceramic tiles. Therefore, when tiling, it is important to ensure the use of tile adhesive containing an appropriate amount of HPMC to ensure construction quality and effectiveness.