60b52515_ons_Flags___EngineHub_org_Wiki__Description
[Flag] build [Default] N/A [Default Group*] Non-Members [Type] State [Description] 
All members and owners will be able to build normally without changing this flag, do not change it. This flag overrides all region build checks. Deny always takes precedence over allow. If you simply want to protect a region, you don't have to touch this flag. By default no one can build in a region until you use addowner/addmember to add a player to the region.
WorldGuard/Regions/Flags - EngineHub.org Wiki
Description