Spruce Slabs are half-versions of their respective blocks. They can occupy either the top half or the bottom half of a block or both as well.
To make Spruce Slab, you’ll need Spruce Wood Log and Spruce Wood Planks. Please follow the following steps to make a Spruce Slab.
Spruce Wood Log
In order to make a Spruce Slab, the basic item you will need is spruce wood block. Find a spruce tree and use your iron axe to chop down a piece of spruce wood. You can find spruce trees in the taiga biomes.
Spruce Wood Planks
After that, you will need to use the crafting table to craft spruce wood planks. Head towards the crafting table and open up 3*3 crafting grid to add spruce wood log in the center or any cell of the grid. You will get four spruce wood planks from one spruce log in the right-side box of the crafting table. Add these planks into your inventory.
Now you can craft a Spruce Slab using the crafting table. Add three spruce planks in any row of the crafting grid as shown in the image below. You will get six spruce slabs in the right-side box of the crafting table. Add these spruce slabs in your “ready to use” stock.