The Mapei Shower Waterproofing kit is a ready-to-use kit, designed for waterproofing indoor wall and floor surfaces that are not prone to rising dampness or are in permanent water immersion. This kit is ideal for use alongside our Trepanel Aqua® Panels, protecting your bathroom design from leaks and moisture! it’s suitable for use on a wide variety of surfaces, so you can be sure to achieve the finished bathroom style you’ve been dreaming of. Read on to learn how to use the shower waterproofing kit from Mapei.
1 – Preparation of Your Existing Surface
Your existing surface must be solid, clean, dry and free of any oil or grease. This includes any old paintwork too! Always ensure your existing surface is also secure and stable. Be sure to also check for any existing mould. If applying onto these surfaces, ensure you also allow their appropriate drying times.
- Gypsum Plaster – 4 weeks (1 week for skim coats on plasterboard)
- Sand: Cement render – 2 weeks
- Concrete – 6 weeks
Ensure any construction boards are well secured and rigid with no protruding fixings and that propriety boards are installed as per manufacturer instructions.
Substrates that are highly absorbent or gypsum-based must be pre-treated with the Shower Waterproofing Kit Primer that is included. Wait 30 minutes to 2 hours until the coating of the timer has completely dried.
2 – Application of Shower Waterproofing Kit
To ensure the best results with the shower waterproofing kit, we recommend installing the Shower Waterproofing Tape to form elastic joints between internal wall angles and board joints, around any pipes and between walls and bath/shower trays.
Cut the tape to an appropriate size using a sharp knife or scissors. If you are applying to a shower tray or bath. be sure to thoroughly degrease the edges to be waterproofed with a suitable solvent such as acetone. Lightly abrade the surface you are applying the tape onto, and wipe with a solvent again.
Using a brush, apply a narrow strip of Mapegum WPS that is slightly wider than the tape applied. When applying the tape to your shower base/bath cut one side of the scrim edge from the Shower Waterproofing Tape leaving the grey rubber centre. Do not cut for other areas e.g. internal wall angles.
Ensure the tape sits on the shower base, cut edge over most, but does not protrude beyond the thickness of the covering and its adhesive bed. When installing the tape, ensure the tape is flush to the substrate with no air pockets or creases. Using a brush, apply a narrow strip of Mapegum WPS that is slightly wider than the tape applied.
3 – Application of Mapegum WPS
Mapegum WPS must be applied evenly in thin coats. Wait until the first coat is dry before you apply any further coats. This can take between 1-2 hours depending on the temperature of the room. The final thickness of Mapegum WPS must never be thinner than 0.8mm (equivalent to a dry thickness of 0.5mm), in order to form a consistent, flexible continuous coat. Make sure that there are no gaps caused by imperfections in the substrate.
After 12-14 hours from applying the final coat of Mapegum WPS (according to temperature conditions), the surface is ready for your wall or floor covering!
If you are applying Trepanel Aqua® to your walls, apply these according to our “How to Install Bathroom Wall Panels” or “How to Install Waterproof Wood Wall Panels“.
