Blocks on slabs
Blocks rest directly on the slab beneath them, with their outlines and interactions at the same height.
How Slabbed works
Slabbed lets blocks and decorations rest on lowered surfaces. A chest can sit on a slab, a fence can meet a lowered floor, and decorations can follow the wall or beam you attach them to.
Build on the surface you can see.
Place a supported block on a slab and it rests on the slab rather than floating above it. Its outline, collision and interactions should match that visible position.
Placed height should stay put. Ordinary changes to neighbouring blocks should not move a newly placed block. Unexpected movement is a bug.
Known issues depend on the edition.
Slabbed supports more than a single half-block step, but some block types and mod combinations still have problems. The release notes distinguish working features from open issues for each edition.
A deeper stack
Deeper placement is available on supported editions. A specific block refusing placement or landing at the wrong height needs its own report.
Placement problems
Unexpected height, a misleading outline or an interaction that misses the visible block is not intended behaviour.
In the Fabric 26.3 alpha, some deep chain, dripstone, door, carpet, banner and bed arrangements remain open issues. Broad modpack compatibility is not yet established.
Placement height and the new adjustment keys
Fabric 26.3 with Slabbed 0.6.0 alpha 1 has two optional keys for adjusting an eligible placed block. Both start unbound in Options > Controls > Slabbed. They move it down toward its supporting surface or back up to ordinary height; they do not offer unrestricted positioning. Shared worlds require Creative mode or operator permission.
Minecraft's usual height
The block remains at its ordinary Minecraft height.
Resting on a slab
The block rests directly on the slab beneath it, without a half-block gap.
Building at greater depths
Supported depths and block types depend on your Minecraft version, loader and Slabbed file. Check the notes for your edition.
These controls belong to the Fabric 26.3 alpha. Do not assume an older Minecraft edition includes them.
Where to aim, and where the block should sit
Without Slabbed
With Slabbed
Illustration: a supported block above a bottom slab. The slab stays in the same place; Slabbed changes where the block above it sits.
- 1
Place on the slab's top
Aim at the visible top of a bottom slab. A supported block should rest directly on it, without the gap shown in the 'Without Slabbed' illustration.
- 2
Extend from the visible side
Aim at the visible side of a lowered block to extend that part of the build. The ground or another supporting surface can limit how far down the next block can sit.
- 3
Use the outline as a check
The outline should surround the block you see. Clicking, walking and interacting should happen at that same height.
- 4
Check edition-specific features
The optional height keys and flower-pot settings described here belong to the Fabric 26.3 alpha. Other Minecraft versions have their own feature sets and known issues.
Before upgrading an existing world
In Fabric 26.3 with Slabbed 0.6.0 alpha 1, worlds built before 0.5 can show their older lowered blocks flat. There is no automatic conversion, and the new height keys cannot convert those placements. Back up first and consider trying a copy or fresh world. Other editions have their own upgrade notes.
New flower-pot choices
The Fabric 26.3 alpha lets new plain flower pots sit flush or retain vanilla's small gap. Changing the setting does not move pots you have already placed.
Mod combinations
The 26.3 alpha was checked with the vanilla renderer. Compatibility claims from an older edition do not establish support for the same mod on 26.3.
What is being worked on
The homepage separates available files from current development on each Minecraft version and loader.
Include your exact Slabbed version, Minecraft version and loader when reporting an issue.
View or report a Slabbed issueWhy ports take time
Minecraft updates can change how blocks are drawn, placed, moved and saved. Slabbed touches all of those things: a lowered chest needs to look right, open where you click it, keep you from walking through it and stay in place when you reopen the world. A change that works in one Minecraft version can need a different solution in another.
Fabric, NeoForge and Forge also give mods different ways to work with the game. Older Minecraft versions may lack features that a newer version relies on, while newer versions can replace something an earlier edition used. Lighting, performance and building mods add their own differences to check.
A port can start without crashing and still have a misplaced outline, a decoration floating above its wall or a block that changes height after loading. The time goes into finding those differences, adapting the fixes and trying the affected builds again. Useful fixes can then need to be brought back to the other editions, too.
That is why releases do not always arrive together. Each Minecraft version and loader needs its own working edition; releasing one does not make the others ready.
To my alpha and beta testersSlabbed is better
Slabbed is better
because of you.
Thank you for trying the early builds, sharing what happens in your worlds, and taking the time to explain when something goes wrong.
Every report helps me track down problems and make Slabbed more stable. Your patience, encouragement and support mean a great deal to me.
I couldn't do this without you.
Peetsa