Fasten X-Crack to ceiling trusses or conventional framing members before drywall installation.
(1) Adjust X-Crack to angle of corner. For inside corners, surface of PVC hinge faces framing members. For outside corners, surface of PVC hinge faces out.
(2) Using drywall screws, first fasten X-Crack at end of lengths. Align center and fasten to framing members. Overlap X-Crack approximately one inch at joints.
Let X-Crack float over irregular framing members to create a straight line. Six screws per length is all that is required to hold X-Crack in place. The last screws in the field secures drywall to ceiling - and the screws through drywall into body of X-Crack secures inside corners.
Install drywall over X-Crack with fine or coarse drywall screws. (3) Be sure the drywall screws penetrate the X-Crack product but miss the truss or ceiling joist by 2 to 4 inches.
(4) The last screw in the field should be 10 to 12 inches away from X-Crack. This allows ceiling members to move independently of drywall joint.
Use Strait-Flex Mid-Flex250 or Mid-Flex300 drywall tape to finish the application.
X-Crack’s patented hinge and flexible tab design holds drywall joints stationary while structural framing members are allowed to move independently of the drywall. (5) Causes for this movement may be due to lumber shrinkage, snow or wind loads, expansive soil, and truss uplift.
(6) Screws that secure X-Crack to ceiling member
Penetrates: X-Crack, Framing Member
(7) Screws that secure drywall to X-Crack
Penetrates: Drywall , X-Crack
(8) Last screws in field ‰Û¬Penetrates: Drywall, Framing Member