BG Bracing

BG Bracing (stands for BackGround Bracing) is the background equivalent of Bracing. It can be used to hide everything that is inside your fort, since bracing cannot overlap with anything.

Main use
BG Bracing can be used to expand your fort, but some might notice that converting BG to FG (ForeGround) costs resources, though converting from FG to BG does not. It is thus better to build out of FG first, and change afterwards if needed.

It is generally used for wind turbines, as it lets pass wind through. The only other materials to do so are shields, and ropes.

Other uses
BG can be used to hide doors, as you can only see doors if they are directly at the surface of your fort. Using some in front prevents your enemy from knowing if a door is opened or closed.

You might want to use BG on the back of your fort, to be able to shoot missiles using missile silos. Though placing a silo will make the conversion from FG to BG automatically.

You can significantly protect yourself against warping by placing a layer of BG bracing in the front of your fort that will let conventional projectiles pass through but still hold your fort up if the bracing and doors behind it are destroyed.