Mastablock

Mastablock is a pink plasterbased setting cement designed specifically for back-blocking ceiling joints in accordance with AS 2589.1. Back-blocking reinforces the joint, minimises deformation and possible cracking that may occur due to stresses from building movement. Mastablock has a working time of 3.5 hours and sets in 4 hours, allowing plenty of time to complete back-blocking and maximise use of a single gauge.

Great for skillion roofs as ceiling joints can be back-blocked progressively, working from below the board.

Mastablock mixes easily by hand or electric mixer to a smooth gauge, providing a strong bond between back-block and plasterboard lining.

mastablock packaging 20kg - back-blocking cement
mastablock packaging 20kg - back-blocking cement

Further information

Applications:

  • Siniat strongly recommends back-blocking for all ceiling joints.
  • Only mix enough cement to be used in 3.5 hours, and do not contaminate with previously mixed batches.
  • Once the material starts to set, it cannot be remixed.
  • Apply with a notched spreader.
  • After applying Mastablock to the back-blocks, do not allow it to dry out before placing on the back of the board.
  • Must be set before commencing any jointing.

Benefits:

  • Strengthens joints
  • Minimises joint cracking
  • Long setting time
  • Mixes easily by hand or electric mixer
  • Provides a strong bond between back-block and plasterboard lining

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