The Yellow Wood Wall is a dark-yellow wooden building-block with parallel floor boards. Like all other cubic building blocks, blocks of Yellow Wood Wall too can be rotated into all directions by holding r (as the default key) and moving the left mouse button.
It can be crafted in your Crafting Menu (default key "q") after the according crafting recipe has been unlocked by
- crafting or obtaining blocks of Wood Wall (e.g. from Stone Treasure Chests that spawn on blocks of the Fossil layer)
- and obtaining Yellow Pigment by putting Yellow Flowers (either from Cragwood trees or Wood Treasure Chests that spawn at night on surface blocks in the dark) into a Processor, or by finding this pigment in Obsidian Treasure Chests on blocks of the Stalactite layer
To craft 8 (blocks of) Yellow Wood Wall, you'll need (as of R44 in June 2017)
- 2 Wood Slabs made of any kind of Wood (except for corrupted wood) or Logs in a Processor
- 1 Yellow Pigment made of Yellow Flowers from Cragwood trees in a Processor or found in Obsidian Treasure Chests
Attention: Yellow Wood Walls are flammable! When placing Yellow Wood Walls into hot environments close to (or especially directly above) torches or fiery blocks (like Hardened Lava), Yellow Wood Walls can easily start to burn. Liquid Lava or Fire Bombs will immediately set them on fire.
If Yellow Wood Walls start burning, also 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.