|Is Stackable||Yes (40)|
|Is Fluid Blocker||No|
Description (From Recipaedia)
Trapdoors are used to make vertical entrances to buildings. They can be opened and closed by clicking on them. When connected to a copper wire, trapdoors will open or close on the rising edge of electric signal. Iron trapdoors cannot be operated manually when electrically connected. They can be placed normally or upside=down, depending whether they are attached to top or bottom side of the block. Upside=down trapdoors will stop falling blocks.
Requires 6 planks. This will yield 2 trapdoors.
- Trapdoors were added in the 1.7 update. 
- They are air blockers whether open or closed. They will stop heat loss even if left open.