The list below contains all the of the large blocks since only large grids currently are the only ones capable of being pressurized. By default, all blocks that haven't been fully constructed will not be airtight.
Some blocks placed outside of a room may not seal a room, windows are commonly found to have problems in this area. If placed on the outside, it isn't considered a seal since the Mountpoints of the frames aren't directly connected to the neighboring blocks. There are also a few instances of blocks sealing a room while visually it shouldn't be. Corner type blocks are sometimes found to have these problems.
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|Green - All blocks under this designation are airtight (capable of being pressurized) when fully constructed.
|Yellow - All blocks under this designation may require a certain orientation or combination of neighboring blocks to allow for an airtight seal.
|Red - All blocks under this category cannot seal a room, no matter the orientation. Some may appear to fill an entire block space, but they will not seal the room.