Why do I need this?
If water gets in behind tiles through….
a) cracked or missing grout
b) an incomplete / broken silicon seal
c) the grout itself and the substrate (wall material) behind the tiles is not waterproof, then it can fail resulting in tiles falling off walls and major remedial work to put everything right.
Do it right 1st time and you will not have to do it twice!
Waterproof tanking it is a waterproof system to protect sensitive substrates in tiled areas such as showers, bathrooms and wet rooms.
Waterproof membrane inhibits the passage of moisture from within the tiled area through to surfaces and which may be sensitive to the effects of prolong water migration.