Sealing Bathrooms & Showers
A bathroom is made watertight in two steps: surface waterproofing beneath the tiles (bonded waterproofing) and elastic connection joints in sanitary silicone. Only that combination reliably protects shower, bath and basin from moisture damage and mould.
How to do it
- Check the substrate: clean, dry, sound; prime absorbent surfaces.
- Waterproof wet areas with liquid membrane and sealing tape (corners, pipe penetrations, floor-to-wall junction).
- After tiling, seal all connection joints with mould-resistant sanitary silicone.
- Strike the joint off with smoothing agent - never smooth it dry.
Matching products
In the shop you will find sanitary waterproofing (liquid membrane and sealing tape), sanitary silicone in over 80 colours and joint smoothers and smoothing agents.
Frequently asked
How often does a silicone joint in a bathroom need renewing?
Silicone joints are maintenance joints: every 5 to 10 years depending on use - and at the latest when they crack, come away or grow mould.
Which silicone for the shower?
A mould-resistant, acetoxy-curing sanitary silicone such as OTTOSEAL S100 - permanently elastic and available in almost any tile colour.
Guides on Sealing Bathrooms & Showers
All 69 guides
Basics
Guide: bathroom waterproofing – rules and exposure classes
What DIN 18534 requires in the bathroom: classes W0-I to W3-I, heights and matching systems
Instructions
Guide: waterproofing a bathroom with liquid membrane
Waterproof a bathroom under tiles with liquid membrane, sealing tape and collars
Instructions
How to: waterproof a shower with liquid membrane and sealing tape
Waterproof the shower before tiling with liquid membrane, sealing tape and collars
1 product
Content: 6 Kilogram (€14.63 / 1 Kilogram)