Back-blocking adhesive compound

Back-Blocking Adhesive is a plaster-based setting type compound specially formulated for back-blocking ceiling or wall joints.Back-blocking is a mandatory fixing practice described in AS/NZS 2589:2007 Gypsum linings – Application and finishing.Back-blocking reinforces plasterboard joints and minimises cracking and peaking resulting from building movement.

Plaster based setting type adhesive compound for back-blocking ceiling and wall joints.

INSTALLATION

Cut pieces of USG Boral Plasterboard sheet to sizes no less than 200mm wide for recessed joints and 400mm wide for butt joints that will fit loosely between the framing members; the gap at each end must be no greater than 30mm
Apply back-blocking adhesive over the full face of the plasterboard pieces, using a notched spreader, to form beads of adhesive paste at right angles to the joint
Fix USG Boral Plasterboard sheets horizontally to framing members, placing the back-blocks centrally along the full length of the sheet’s edge; ensure an overhang of at least 100mm for bonding to the next sheet
Fix the next sheets immediately after the back-blocks are in place
Alternatively, ceiling back-blocks may be cemented into position from above the ceiling after the sheets have been fixed and before they are flush jointed
Ensure all butt joints are raised, forming a recess, prior to back-blocking

Technical Resources

Back-blocking adhesive compound

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