VerticaSlabBlocks

Normal slabs split a block horizontally. VerticaSlabBlocks adds vertical halves that occupy the left or right side of a block space, and two compatible halves can share one space. That makes thin walls, pillars, window frames and detailed façades possible without awkward workarounds. The set covers a broad range of block types, and the mod reuses existing textures so resource packs still apply.

Wherever possible a vertical slab keeps the appearance, sounds, interactions and special behavior of the original block. Some blocks in the set keep their redstone output, light emission, target behavior, note block instrument behavior, amethyst resonance, chiseled bookshelf storage and comparator output, and magma block behavior. Placement is meant to feel close to vanilla slab placement. Several placement modes make larger builds easier, and supported slabs can be converted between the normal horizontal form and the vertical form, so a builder does not have to craft each variant separately.

The mod is published for Fabric and NeoForge, with files for 1.20.1, 1.21.1 and 26.3. Only the player's game needs it, and servers run without it. It is released under All rights reserved and is not open source. Support continues as development progresses.