78 INTERIORS
fixing techniques leave voids behind the tile, in which moisture can be harboured and mould can develop. Tile or stone greater than 12 mm in thickness should be mechanically fixed as per BS 8298. A suitable substrate (e.g. plywood or blockwork) must be in place behind your chosen waterproofing in order to support this load.
Correct ‘falls to drainage’ Specifiers should accommodate falls to drainage in one area of the wetroom, unless the room is particularly small. Falls should be between 1:35 and 1:80 (i.e. for every 80 mm the incline travels towards the waste outlet, the floor level will fall 1 mm) as per BS 5385 Part 3. Falls should always be below the waterproofing layer, not in the tile adhesive applied above.
There are two main methods used to create falls. The traditional method involves using a screed formed to the required falls to drainage. The lowest point in the screed should still meet British Standards; if a screed is too thin, it will crack or crumble when under load.
The other option is to use a preformed shower board which is manufactured with
You can easily achieve a wetroom that not only looks great to suit the client’s needs, but also performs as it should
the appropriate slope already created. Some also come ready-equipped with waterproofing layers.
Specifying a wetroom can be something of a juggling act; a client will likely have a strong opinion as to how it should look and tie in with the rest of a building and therefore focus can be drawn away from getting the fundamentals correct. However, if the factors listed above are taken into consideration, you can easily achieve a wetroom that not only looks great to suit the client’s needs, but also performs as it should, resulting in a long-lasting and beautiful installation.
Ian Knifton is head of technical and training at Schlüter-Systems
WWW.ARCHITECTSDATAFILE.CO.UK
ADF NOVEMBER 2021
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