The most basic of all roofs. Depending on the specific building, it can vary a little. If your roof has a “slope” it might be a shed roof.

  • Go inside the exterior walls

  • Make sure your legs are one block below the top of the exterior walls

  • Use the command below with a block ID or pattern of block IDs, making sure there are no holes in the walls at the y level of your legs. Do not use a radius larger than 100

//fill <block-ID> <radius>

Detailed explanation of //fill here.