BS 5385 Part 4:2015 Recommendations in Respect of Showers
BS 5385 is a British Standard wall and floor tiling code of practice.
BS 5385 Part 4 deals with the design and installation of ceramic and mosaic tiling in specific conditions.
BS 5385 Part 4.7: specifically addresses wet and damp conditions.
BS 5385 Part 4.7.2: deals with wet and damp conditions not continuously immersed.
BS 5385 Part 184.108.40.206: Advises that such wet and damp conditions as detailed in 7.2 should be divided into 3 groups:
a) installations in high humidity areas (see 7.2.2)
b) installations not immersed but subject to occasional wetting (see 7.2.3)
c) installations not immersed but subject to frequent wetting (see 7.2.4)
BS 5385 Part 220.127.116.11 States the following should apply for part c above, including wet rooms and domestic power showers.
a) The basic structure behind the tiles should be watertight and should be tanked.
b) Water-resistant materials should be used throughout. Plaster and plasterboard, would be unsuitable in frequently wetted areas.
c) The tiles should be solidly bedded so that voids behind them are eliminated as far as possible.
d) When the installation is tanked and water-resistant materials are used, cementitious grouting compositions may be specified.
e) Special attention should be paid to sealing the gaps between wall and base, particularly if the installation is on a suspended floor.
f) Where movement joints are subject to water immersion, water spray or splash, the joints should be sealed with curing sealants.