Slabs+

Combine any two different slab types into a single block.

Ever wanted oak and stone in the same block? Smooth quartz and dark prismarine? Now you can. Slabs+ lets players freely stack any two slab types together, opening up a whole new world of decorative possibilities.

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How it works

Just hold a slab and right-click on another slab that's already placed. If the target half is free, the two slabs combine into one block.

• Bottom slab placed? Right-click the top half with another slab → combined.
• Top slab placed? Right-click the bottom half with another slab → combined.
• Click the side? Works too, depending on which half you target.

No special items. No commands. No GUIs. Just place slabs like you always have, and they merge naturally.

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Features

• All 68+ vanilla slabs supported. Any combination, any pair.
• Over 2,000 possible slab combinations.
• Realistic breaking. Each half breaks independently with proper tool detection, hardness, efficiency, haste, mining fatigue, water, and ground checks. Exactly like vanilla.
• Independent drops. Break the top, the bottom stays. Break the bottom, the top stays. Each half drops its own item.
• Pick-block works. Middle-click any half to get the right slab type.
• Explosions work. TNT, creepers, and any other blast properly destroys combined slabs and drops both items.
• Visual particles and sounds. Each half plays its own material's break sound and spawns matching particles.
• Smart placement detection. Clicking the side of a slab to place into a neighbor cell? Plugin knows the difference — no accidental merges.

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Commands

Command	Description
/slab info	Show debug info about the block you're looking at
/slab fix	Repair a corrupted stacked slab

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Compatibility

• Server: Paper / Purpur (any fork supporting Paper API)
• Java: 21+
• No client mods required. Pure server-side magic.

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Performance

Built for busy servers. Stacked slabs are indexed per-chunk via an internal overlay cache, so lookups stay O(1) even with thousands of combined blocks across the world. Tested on 40+ player servers without measurable TPS impact.

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How it works under the hood

Each combined slab uses an invisible barrier block as the carrier (full collision, full physics) with two block_display entities overlaid on top — one for each half. Display entities are extremely cheap and don't tick, so the performance cost is negligible.

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Known quirks (intentional)

• Map rendering. Combined slabs appear invisible on paper maps and online mapping plugins (Dynmap, BlueMap, etc.) because the carrier is a barrier. Cover with carpets if it bothers you.
• Pistons don't move them. Like obsidian. This is intentional to prevent display desync.
• Ladders, torches, levers, etc. can attach to combined slabs. Because the carrier is a full cube, you can stick decorative blocks to the sides of any combined slab. This is a happy emergent feature — use it for cool builds.