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I'm trying to make a bridge in Minecraft and want to make a vertical slab. How do I do it?

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I'm not sure what you are asking here. A slab is a half block made at the crafting table. But if you are trying to make a vertical "stack" - ie a tall pillar of blocks, it can be created by jumping and placing a block under you until you get to the desired height. – ChargingPun May 16 '13 at 17:48
I think she was hoping to make a vertical half-block, not just stacking a bunch of half blocks to make a column. – Sadly Not May 16 '13 at 17:49
Try an open trap door as an alternative – shanodin May 16 '13 at 17:56
@AliceRees Because they need to be attached to another block, the highest free-standing riser you can get with an open trap door is 0.5 metres. That might work well for short bridges, though. – SevenSidedDie May 16 '13 at 19:45
Are you maybe thinking of walls? – Batophobia May 16 '13 at 20:29

Slabs can only be placed horizontally. They can be placed either in the "bottom" or "top" half of the space a full-sized block would occupy, but not vertically in the "left/right" or "front/back" halves of a block's volume.

From the wiki entry:

Slabs are half-blocks. Upside-down slabs occupy the top half of their block space rather than the bottom half. To place a slab upside-down, right-click on the bottom of a "ceiling" block, which can be removed after the slab has been placed, or by right clicking the top half of another block, if the player wishes to place it on the side of another double or single slab block.

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Vertical slabs are not in the game. however, depending on your design, you might be able to use stairs for the effect you need

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The nearest you get to vertical slab is a wall. It can be made only of cobblestone (not smooth stone), manufactured by placing cobblestone in two rows:

 [ ][ ][ ]

The wall occupies slightly more than one block of vertical space, similar to fence, but you can build on top of it, and it occupies roughly half the block width. Unlike slabs, though, you can't fit two walls in one block - a wall normally goes through the middle of the block and adapts itself in shape to neighboring walls similar like a fence or a pane of glass.

There is no direct vertical counterpart to a horizontal slab in Minecraft.

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