Covers are a type of Sub Block that completly cover the side of the block they are placed on. 2 Covers can be crafted by placing a Panel into the crafting grid with a Handsaw above or below it. It can also be crafted by combining 2 Cover Strips , or 4 Cover Corners. Covers are the thinnest Sub Blocks, and can be combined with each other or other Sub Blocks to form Sub Blocks of varying thickness.
These recipes will work regardless of the placement in the crafting grid, as long as the right number is present. Panels, Triple Covers, Slabs, Cover Slabs, Triple Panels, and Anticovers of the same material can by used in place of the number of covers used to create them.