===Subterranean paving===
Paving underground(in mines) can be done by first reinforcing the mine floor. To reinforce, activate a [[support beam]], right click the floor tile, choose reinforce. After the tile is supported, apply 5 mortar to the reinforcement by activating it, right click the tile, choose prepare. Once the tile is prepared, you're able to perform normal above-ground paving methods(all above options are available underground as well).
It should be noted that paving diagonally is not possible whilst underground.