BetterSlabPlacement
by jinhua
BetterSlabPlacement lets a player place a full block on the top or bottom half of a slab position, which changes how slabs are set in builds.
What it does
Normally a slab fills only half of a block, so building with full blocks inside a slab gap means cutting around them. The mod removes that limit by allowing full blocks to be placed on the top or bottom half of a slab space. This gives builders room to lay out walls, floors and roofs, and suits work such as house exteriors, room interiors and uneven ground.
The change affects only where a block is placed. It leaves stored world data, block physics and other game mechanics untouched, and no extra configuration is needed: it works as soon as the game loads. Because it only adjusts placement, it stays compatible with vanilla, and the mod runs on the client alone, so installing it on a multiplayer server is not required.
The mod is published for Fabric only, with one file, version 1.0, for 1.21.11. It requires Fabric API, which must be installed alongside it. The mod is released under the Creative Commons Attribution 4.0 license and is not open source.
Key features
Full blocks in slab spaces
Full blocks can be placed on the top or bottom half of a slab position instead of only against it.
Placement only
The mod changes where blocks go and leaves stored world data and block physics as they are.
Collision check
A collision check runs during placement so blocks are not set where they would overlap existing ones.
Works on load
The change applies immediately once the game has loaded, with no settings to adjust first.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Builders who mix slabs and full blocks, and players who build in survival or creative worlds on a vanilla-compatible setup.
How it compares
Beta Block Placement is client-side only, uses All rights reserved and is not open source, with a single file for 1.21.1. Slab Manager runs on client and server, is open source under the CC0 1.0 Universal license and has a file for 1.21.11, the same version as BetterSlabPlacement. Unslab is open source under the GNU General Public License v3.0 only and covers 1.20.1 – 1.21.5, but it needs the server and only optionally the client.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| BetterSlabPlacement | Fabric | 1.21.11 | Client-side only | 2026-07-20 |
| Beta Block Placement | Fabric | 1.21.1 | Client-side only | 2026-07-01 |
| Slab Manager | Fabric | 1.21.11 | Client and server | 2026-02-23 |
| Unslab | Fabric | 1.20.1 – 1.21.5 | Server required, client optional | 2025-05-29 |
Questions
Does BetterSlabPlacement need Fabric API?
Does a multiplayer server need the mod installed?
Does the mod change how the world behaves?
In the catalog
BetterSlabPlacement is one of 29,952 Game mechanics mods on ModsFinder, and one of 19,630 Game mechanics mods for Fabric. 19,862 mods support Minecraft 1.21.11.
Similar mods
Official listing
- Modrinth page
- modrinth.com/mod/betterslabplacement
- Owner
- jinhua
- Published
- 2026-07-20
- Updated on Modrinth
- 2026-07-20
- Facts verified
- 2026-10-15