Cut out the required section of flooring. See figure 1.
All Imperboard trays should be supported between joists. Build a support for the drain body exactly 80mm below the surface of the surrounding floor. See figure 2.
Fix a batten 18mm (or the depth of the flooring used) below the top of the joists. See figure 3.
Connect the drain body to a 50mm BS standard waste pipe with solvent weld in the usual way. (Always check for leaks before final installation of the Imperboard tray). Cut the timber to fit between the joists and screw onto the new battens which must be securely fixed to the sides of the joists. See figure 4.
The middle section needs a keyhole shape cut out for the waste. This should be 10mm bigger than the drain body. See figures 5 & 6.
Using a 10mm notched trowel apply the flexible, cr- ment-based tile adhesive to the floor then fix the shower tray in place using a tamping motion to ensure no voids remain underneath. See figure 7.
Screw the upper section of the drain body into the lower section through the tray, being careful not to disturb the tray. Realign as necessary. See figure 8.
Build up the surrounding floor area with the correct thickness of Imperboard as required using flexible, ce- ment-based tile adhesive. See figure 9.