Drywall Control Joint: A predetermined separation (space) installed or created between adjacent surfaces in large walls and ceiling areas to relieve stress and minimize cracking caused by movement.
Drywall control joints have been known to be overlooked by contactors and architects alike, and only after the damage is done is the absence of a control joint noticed. A well written drywall specification (092900) will generally call out the requirement for drywall control joints, which will protect the architect. However, if that specification requirement is missed by the contactor, and the control joint is not installed and it leads to drywall cracking, the contractor may be forced to remedy the situation.