Double Slabs

Double Slabs

Allows vanilla and modded slabs to be combined and placed vertically

by
33.5K Downloads
fabricforgeneoforgedecorationgame-mechanics
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Screenshots

Double Slab Example

About this Mod

Double Slabs

For the longest time I've been mildly infuriated by Minecraft slabs. Why on earth can't we place different types of slabs on top of each other??!! It makes zero sense to me so that's why I created this mod.

Double slabs is all about improving the vanilla and modded slabs through minor tweaks to their behaviour.

Features

  • Mixed Double Slabs - Have you ever wanted to place two slabs of different slab types on top of each other?? Well now you can!
  • KleeSab like behaviour on Mixed Double Slabs (or two double slabs which are of the same type if the replace same type option is true). This means that slabs now break separately when mining a double slab and the speed of mining of the individual slab depends on which slab you are looking at and which tool you are using. For example: if you have a mixed oak slab and stone slab, trying to mine the oak slab with a pickaxe will be quite slow but mining the oak slab with an axe will be quicker and vice versa. This a survival mode feature only.
  • Vertical slabs (excluding 1.21 versions) - Simply hold sneak when holding a regular slab to place a vertical version! This also works with combining two vertical slabs including vertical slabs from Quark, just ensure you are not holding sneak to combine!
  • Mod Compatibility - both the mixed double slab and vertical slab feature works with many other mods. Some mods require additional work to be supported.

Can I use this in my modpack?

Of course! This is the main reason I made this mod!

Showcase your creation here!

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! I'm sure you're all much better builders than I am!

Available Versions

DoubleSlabs-Fabric-1.21.1-0.4.2release
MC 1.21.1fabric
June 13, 2026
Double-Slabs-Fabric-1.20.1-0.2.3release
MC 1.20.1fabric
June 13, 2026
DoubleSlabs-Fabric-1.21.1-0.4.1release
MC 1.21.1fabric
January 10, 2026
DoubleSlabs-Fabric-1.20.1-0.2.2release
MC 1.20.1fabric
January 10, 2026
DoubleSlabs-NeoForge-1.21.1-0.4.0release
MC 1.21.1neoforge
January 10, 2026

How to Install Double Slabs on Your Server

1

Order Server

Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).

2

Set fabric Loader

In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.1).

3

Install Mod

Open the mod browser in the dashboard and search for "Double Slabs". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

fabricforgeneoforge

Minecraft Versions

1.21.1, 1.20.1, 1.19.4 (+26 more)

Server-side

Required

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

Double Slabs server crashes on startup – what to do?

Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.1). You can switch loaders with one click in the panel.

Is Double Slabs compatible with fabric and forge and neoforge?

Double Slabs officially supports fabric, forge, neoforge for Minecraft 1.21.1, 1.20.1, 1.19.4. Note: Forge and Fabric mods are NOT cross-compatible – pick one loader and stick with it. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with Double Slabs – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Double Slabs consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.

Rent Modded Server

Install Double Slabs with just one click on your server.

Recommended RAM
4 GBab €8/mo
Min. 3 GB | +1 GB pro 8 Spieler
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NVMe SSD Storage
DDoS Protection included

Details

License
GNU General Public License v3.0 only
Server-side
Required

Supported Versions

1.21.11.20.11.19.41.19.31.19.21.19.11.191.18.21.18.11.18+19 more