How should concrete or pumice blocks used for interior wall construction be finished?

The correct answer is that concrete or pumice blocks used for interior wall construction should be sealed, finished, and filled. This practice is essential for several reasons. First, sealing the blocks helps to prevent moisture infiltration, which can lead to water damage, mold growth, and deterioration of the wall material over time. Additionally, filling the blocks promotes better insulation and soundproofing, enhancing the overall performance of the wall.

Finishing the blocks also provides a more aesthetically pleasing appearance, which is important in interior design. An unfinished surface may appear rough and uninviting, while a finished surface can be smoother and more suitable for painting or additional wall treatments.

In contrast, leaving the blocks bare for ventilation may lead to issues with temperature control and moisture retention, which are undesirable in a living space. While painting with water-based paint or covering with wallpaper may seem like options, they are typically applied as a finishing treatment after sealing and finishing the blocks. Simply painting or wallpapering over bare blocks would not address the potential issues related to moisture and surface texture. Therefore, the comprehensive approach of sealing, finishing, and filling provides the best solution for both functionality and aesthetics in interior block wall construction.