Wet Room Drain

The most important factor for a drain is that its capacity is superior to the shower's flow rate; if it is not then water will not drain fast enough and water will pool on the floor. If possible, use the drain configuration with the largest capacity as alterations may be made to the shower which can increase the flow rate beyond the drain's capacity. A common issue mainly with concrete constructions is low building depth which can determine if level access is achievable. When calculating the available depth to install a drain, the fall in the floor and distance from SVP should also be calculated. Even is level access is desired; the presence on level access should not lead to the use of poor quality products. Most drains are specifically for tiled or vinyl flooring and most are not compatible with both so it is essential that the drain is suitable for the floor covering.

Fall / Slope to drain

For water to travel towards the drain, the floor in the shower are needs to fall towards the drain. There are a few different methods for creating the fall in the floor and the methods typically depends on the installers preferences and experience. The most common in the UK & Ireland is to use a preformed board which has the fall built into it. Instead of a preformed board, ply or tile backer board can be used which are formed so that there is a fall to the drain. Another method is to use a specialist screed which is poured and formed , this is the method preferred by Advanced Wetrooms as it provides a very strong base for the drain and can achieve any wet room design. Specialist screed which can work at very thin levels is recommended to others compounds such as a sand and cement mix as support around the drain is essential and is typically a thin layer. The call in a wet room should be between 1.25% and 2%. When using small tiles like mosaic, it is advisable that 1.5% to 2% gradient is used.


Waterproofing / tanking membrane is available in a number of forms such as liquid, paste and sheet. When waterproofing a wet room / bathrooms / unitility room etc. we reccomend the below waterproofing zones are used. By waterproofing all of the floor and 100mm up all walls it prevents the issue of leaks traveling through another part of the room and through the floor / walls. All major moevement joints should be reifroces using the reifocnremnt tape typically provided with waterpoofing kits. Moevemnt joints are where two materials will meet each other e.g. around the drain, where the wall and wall / floor meet, any gaps between ply and tile backer board. Some flooring is not compatible with waterproofing membrane e.g. some vinyl / resin flooring.

Application of tile adhesive

Some tiles and stone are porous and therefore water can naturally get under the tiles. The adhesive used should be design for wet areas and be compatible with the waterproofing. When installed, a full bed should be applied with no voids.


Architect and Interior Designer

Wet room and waterproofing specialists

Experienced company which have been guaranteeing waterproofing installations for over 20 years

Knowledgeable team to provide design and technical advice

Dedicated project manager to oversee installation

Professioal and certified installtion team to complete work on time to the best standards

Project specification to ensure the best solutions are used

CAD service for drainage and build up details

Site survey to ensure that everything goes smoothly

Peace of mind