DAY 1

(After checking that drains are connected and set flush)

Scrape, Sweep, Gerni (if walls rendered) or vacuum

DAY 2

(Or when dry)

Seal shower corners to 2m, perimeters up 150 and around drains and pipes with Multiseal.

Caulk floor perimeters and up 150, with fine bead in shower corners, also around drains and pipes.

Brush Multithane up 150 around walls and shower areas.

Multiseal the rest of the floor (provided day 3 is the next day).

When dry, brush Multithane up 150 around walls and the shower areas (second coat), and then roll the main coat at 1.5li/sqm.

DAY 3

(Must follow day 2 in summer; you will most likely have to wait till the next day in winter, or longer if still tacky)

After priming with Duroprime ARW, apply first coat of acrylic to shower walls.

Cut and bed 20 x 25 aluminium angle with PU25 urethane sealant and seal at sides to the doorway and to isolate the shower floor.

(Alternatively, fix angle at the beginning of Day 2, bedding with PU25).

DAY 4

Second coat of ACS to shower walls.

Provided fully cured and no tackiness, (cure time dependant on temperature and humidity), plug drains and fill with water to 50mm.

DAY 5

(After checking OK)

Remove plugs.

Start tiling floor.

DAYS 6-7

NB.

ALTERNATE SYSTEM

Provided acrylic is quite dry, start tiling walls.

Solvent based urethane chemically cures to rubber.

Water based acrylic dries out. Any heater will accelerate the drying of the acrylic but the urethane needs hot air blown over wet hessian or cloth to humidify, as well as warm, in order to speed up the cure. If the membrane is firm but still tacky, throw dry sand and lay plastic so you can then walk on it.

Instead of solvent based urethane, you can use water based membranes, eg. SBR latex such as Durabit EF or urethane modified acrylic such as Duromastic P15, for the floor and perimeters and also for the shower walls, starting with the latter but otherwise as above.

After the mortar bed has dried, it is good practice to caulk around the perimeter with Wrimco PU25 sealant and apply ARW followed by 2 coats of ACS to the mortar bed, particularly in the shower area. This prevents discolouration of porous tiles such as travertine, marble and efflorescence at the joints.