Build around the pillar’s radius
Put your crystal pillar near the center of the area you want to protect, then plan the base around its radius. The developer’s building spotlight defines the base by that radius and explains that the pillar shields it against roaming chaos storms.
Check coverage before you expand
Think about where your shelter room and main supplies will sit before adding another wing. Keep both inside the pillar’s radius so you can reach what you need from a covered position. That same base radius lets you craft with materials in nearby chests inside the area.
Move inside when the warning appears
The October 13 demo update says pillar shields appear shortly after the chaos storm warning. Use the warning as your signal to move into the covered part of the base. The same update made the shields visible from farther away, which can help you spot the protected area as you return.
FAQ
Where should I put my first crystal pillar?
Start near the middle of the rooms and supplies you want to keep covered.
Is an extension protected just because it joins my base?
Check where it sits in relation to the pillar. The documented protection is tied to the radius around it.
When should I expect the shield to appear?
In the October 13 demo update, Roboto Games says it appears shortly after the chaos storm warning.