Functional Slabs
Functional Slabs adds slab versions of useful vanilla blocks such as redstone, ice, slime, honey, soul sand and obsidian, and each slab keeps the behavior of its full block.
What it does
Players craft the slabs with a stonecutter, the same way regular slabs are made, so they fit into existing building routines. A half-height redstone slab only powers the blocks it touches, which makes precise wiring possible, while a redstone lamp or copper bulb can be hidden inside a slab floor or ceiling. Slime and honey slabs allow more compact contraptions, and ice slabs give half-height paths that stay slippery.
Soul sand and magma slabs can be waterlogged and used with bubble columns. Obsidian slabs supply a blast-resistant option where it is needed. The mod is built for Fabric 26.2 and requires Fabric API. Mod Menu is optional. Both the server and every player need it, and the code is released under the MIT License, so it is open source.
Key features
Slabs for vanilla blocks
Slab versions of redstone, ice, packed ice, blue ice, slime, honey, obsidian, soul sand and magma blocks, plus redstone lamps and copper bulbs.
Original behavior kept
Each slab keeps the function of its full block, so a slime slab still acts as slime and a redstone slab still carries signal.
Stonecutter crafting
Slabs are made at a stonecutter like regular slabs, so no separate recipe system is needed.
Waterlogging
Soul sand and magma slabs can hold water and work with bubble columns.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Optional 1
Use cases
Hidden wiring
Redstone lamps and copper bulbs fit inside slab floors and ceilings, so circuits stay out of sight.
Compact slime and honey builds
Half-height slime and honey blocks shorten contraptions that rely on their bounce or stickiness.
Who it’s for: Builders who work with redstone, and players who build compact contraptions or hidden circuits in survival or creative worlds.
How it compares
Metal Blocks (Stairs and Slabs) is open source under the MIT License and runs on Fabric for 26.2 – 26.3, with client and server both needing it. Extra More Blocks is also Fabric-only for 26.2, with client and server, but it is not open source and is released under All rights reserved. Functional Slabs covers the same 26.2 range as Extra More Blocks and is open source under the MIT License.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Functional Slabs | Fabric | 26.2 | Client and server | 2026-09-09 |
| Metal Blocks (Stairs and Slabs) | Fabric | 26.2 – 26.3 | Client and server | 2026-10-04 |
| Extra More Blocks | Fabric | 26.2 | Client and server | 2026-07-17 |
Questions
Does Functional Slabs need Fabric API?
Do both the server and players need the mod?
Which game versions does Functional Slabs support?
Is Mod Menu needed?
In the catalog
Functional Slabs is one of 12,078 Decoration mods on ModsFinder, and one of 6,982 Decoration mods for Fabric. 13,894 mods support Minecraft 26.2.
More from tionardchaster
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What the author says
Functional Slabs does pretty much what the name says: it adds slab versions of useful vanilla blocks while keeping their original behavior. They craft like regular slabs and can also be made with a stonecutter.
Official listing
- Modrinth page
- modrinth.com/mod/functional-slabs
- Owner
- tionardchaster
- Published
- 2026-08-22
- Updated on Modrinth
- 2026-09-09
- Facts verified
- 2026-10-15