- collecting Vines from Cragwood trees in Forest biomes or Woodlands biomes, or from Wildwood trees in Jungle biomes (no Power Cells are required for this), or obtaining it from many kinds of Leafies either as a loot or pet-harvest
- crafting a Processor
- and creating Shredded Leaves by putting any kind of tree Leaves into a Processor, except for corrupted leaves
To craft 8 Thatched Walls at once, you'll need (as of R44 in June 2017)
- 2 (blocks of) Shredded Leaves, made from any type of tree Leaves in a Processor, except for corrupted leaves
- 1x Vines taken from Cragwood trees in Forest biomes or Woodlands biomes, or from Wildwood trees in Jungle biomes, which does not require any Power Cell to be equipped
Attention: Thatched Walls are flammable! When placing blocks of Thatched Walls into hot environments, close to (or especially directly above) torches or fiery blocks (like Hardened Lava), Thatched Walls can easily start to burn. Liquid Lava or Fire Bombs will immediately set them on fire.
If Thatched Walls start burning, other flammable blocks nearby can catch fire, and this way a whole wooden house or forest (especially Wildwood, Parchwood and Shorewood) can burn down in hot biomes like Jungles, Savannahs, Shores or on the Lava layer.
Fire cannot be extinguished currently, it can only be stopped from spreading by creating forest aisles/swaths wide enough so the flames cannot leap over, or (since R33) by claiming the area and disabling the fire spreading option for the claim.
On worlds of players who bought the "Pro" DLC, the fire spreading (fire sim) option can be disabled for the whole gameworld. On player claims, fire spreading is disabled by default, but can be enabled by claim owners.