WetBase Installation Instructions

Clear the working area, establish where you want to fit the tray and place tray on top of the floor boards. Mark around the tray with a pencil and draw the position of the waste hole. The tray can be trimmed with a hand saw up to 50mm off any side if required.

Remove the floor boards from the area where the tray is to be fitted. Ensure you
take the floor boards back to the centre line of the nearest joist to ensure maximum
support. You may have to replace some of the floor boards around the tray to ensure a snug fit.

Identify the position of the drain and trap. Support under the drain with a ply wood timber platform approx 85mm down from top of joists, to prevent the drain dropping after fitting. Test fit the drain and ensure correct alignment before test fitting the (solvent weld) waste pipe.

The tray requires even support underneath and we suggest screwing 50mm x 25 mm runners 18mm down from the top of each side of each joist, and cross noggin with support timbers where necessary. Cut 18m marine ply panels and insert between joists and fasten down to the runners using wood screws. Cut out a keyhole shape around the drain. You may have to extend this area to the nearest joist to ensure correct support for tray and remaining floor.

Test the fit the shower tray to ensure a tight fit, and alignment of drain. Apply a thin bed of flexible adhesive to the area where the tray is to be secured using a notched trowel. Fit the shower tray over the bed of adhesive and firm down ensuring the tray is level in all planes.

Now fit the drain trap assembly using the drain securing tool. We suggest you smear a fine bead of silicone around the underside rim of the trap before finally securing into place. Now over lay the remaining floor area with wetbase thermal tile backer boards.

Apply a bead of silicone sealant to the entire perimeter of the tray and allow to cure. Open up the lastogum tanking kit box and remove the 0.5 ltr white bottle of primer. Follow the mixing instructions and apply primer to the walls and floor of the area you wish to tank. Allow to dry as per instructions.

Using a 2 inch paint brush apply a thin bead of lastogum paint on the horizontal and vertical joints of the area you wish to tank.

Starting with the horizontal surfaces first, apply the rubberised jointing tape (BLUE SIDE UP) over the lastogum paint. Press any air bubbles out and smooth out the jointing tape and overlap the tape in the corner to form a seamless joint.

Allow the lastogum to dry fully and then apply the first of 2 coats of the lastogum tanking paint to the walls and floor of the wet area. If there is any lastogum left, apply a final coat. The whole shower area should now be a dark grey colour and the blue tape will also be painted over.

If you cannot set the tray level into the floor and have to raise the base up
accommodate above floor drainage or avoidance of beams etc we suggest you
construct a 75mm x 50mm support frame on top of the floor boards the overall size
of the wetroom area and cover in 18mm ply. Then lay wetbase on top and secure
with flexible cement adhesive.
The support frame should resemble a ladder offering support to the tray in all
directions. This can be screwed down to the joists underneath but ensure you have
planned the exit point for the waste pipe and trap. Cut your marine ply deck to size
and test fit.

Place the tray down on top of the marine ply deck and draw round the drain position.
Cut out a key hole shape in the marine ply and ensure trap is correctly aligned.
Secure the ply deck down to the support frame. Then fit the tray and secure with
cement based adhesive ensuring the tray is level in all planes.
Please return to stage 6