What is the fastest way to back-block plasterboard joints?

Readtime 3 : Charles Salisbury : Jul, 22, 2024

There are various ways to back-block plasterboard joints, and most are time consuming and awkward. However, there is a faster, stronger, and cheaper way with Buttx®


Firstly, what is back-blocking, and how should it be done? 


Back-blocking is a method of reinforcing the edges of plasterboard sheets (between framing supports) that butt together. The process is recommended by plasterboard manufactures and is referred to in Australian and New Zealand Standards AS/NZS2589.1.

All ceilings should be back-blocked to avoid cracking, irrespective of the plasterboard type and thickness, or whether batterns are used or not. 

However, back-blocking is especially necessary near the girder truss framework. 

Industry standards suggest back-blocking should be applied where three or more consecutive recess joints are present in ceilings. They must be a minimum of 400mm wide and fit loosely between the framing members. Stud adhesive is applied to the full face of the back-block with a notched spreader to give 6mm x 6mm beads at approximately 20mm centers.


The Intex Buttx® solution is a precision curved rolled steel metal joiner specially designed for back-blocking plasterboard joins. When installing these on butt joints, a recess is formed in the plasterboard face where the board edges meet, allowing the tape and plaster process to fill the join and create a flat finished surface. 


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In turn, the use of temporary battens or packers is eliminated, cracking, and deformation along plasterboard recesses edges (concealed joints). Butt joints are prevented, and glancing light issues associated with butt joints is significantly reduced.


Featuring a knurled face for improved adhesive contact and positive screw point location, Buttx® Joiners are quickly and easily installed by screw fixing through the plasterboard.

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