Double Slabs
Double Slabs lets players stack two different slab types, such as a wooden and a stone slab, into a single block placed vertically.
What it does
Double Slabs changes how vanilla and modded slabs behave when placed. Two slabs of different types can be combined into one block, and the result can be set in a vertical position. The mod is built around small tweaks to existing slab behaviour rather than new block types.
The mod needs Fabric API and runs on client and server, so both the server and every player need it. It is published for Fabric, Forge and NeoForge across 29 release versions, 1.12 – 1.21.1, and the code is open source under the GNU General Public License v3.0 only.
Key features
Mixed double slabs
Two slabs of different types can be placed on top of each other, something vanilla Minecraft does not allow.
Vertical placement
Modded slabs can be combined and placed vertically, which opens building shapes that flat slabs cannot form.
Mod compatibility
Mod compatibility with other slab-adding mods is part of the design, although a few of them need extra work before they are supported.
Gallery
Compatibility
Latest build for each game version and loader.
1.21.x1 of 1 version with builds
1.20.x1 of 1 version with builds
1.19.x5 of 5 versions with builds
1.18.x3 of 3 versions with builds
1.17.x2 of 2 versions with builds
1.16.x6 of 6 versions with builds
1.15.x3 of 3 versions with builds
1.14.x5 of 5 versions with builds
1.12.x3 of 3 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
How it compares
Vertical Slab Placement is a Fabric mod for 1.20.6 – 1.21 under the CC0 1.0 Universal license, and it is open source. R's Vertical Slab is a NeoForge mod for 1.21.4 – 1.21.8 under All rights reserved and is not open source.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Double Slabs | Fabric, Forge and NeoForge | 1.12 – 1.21.1 | Client and server | 2026-06-13 |
| Vertical Slab Placement | Fabric | 1.20.6 – 1.21 | Client and server | 2024-06-16 |
| R's Vertical Slab | NeoForge | 1.21.4 – 1.21.8 | Client and server | 2025-08-26 |
Questions
Does Double Slabs need Fabric API?
Must the mod be installed on the server?
In the catalog
Double Slabs is one of 12,078 Decoration mods on ModsFinder, and one of 6,982 Decoration mods for Fabric. 32,366 mods support Minecraft 1.21.1.
Similar mods
What the author says
Double slabs is all about improving the vanilla and modded slabs through minor tweaks to their behaviour. The popularity of this mod has blown me away (thank you so much!), so if you've created something using Double Slabs, be sure to send me a private message with an image and I might showcase your creation here!…
Official listing
- Modrinth page
- modrinth.com/mod/double-slabs
- Owner
- CJMinecraft01
- Published
- 2025-05-31
- Updated on Modrinth
- 2026-06-13
- Facts verified
- 2026-10-15