Siniat Mastablock 20kg

MastaBlock is a pink plaster based setting cement designed specifically for back-blocking ceiling joints in accordance with Australian Standard 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 to maximise use of a single gauge. Great for skillion roofs as ceiling joints can be back-blocked progressively, working from below the board.