Question: How do I stop water from leaking through my bathroom floor?
Answer: Waterproofing the bathroom floor and wet-area walls with a proper membrane before tiling is the correct way to stop water from seeping to the room below. If the tiles are already down and leaking, injection grouting or targeted repair may be needed.
A leaking bathroom causes damp ceilings below, mould, and damage to cabinets and walls. KL Servis Rumah provides professional bathroom and wet area waterproofing across Kuala Lumpur and Selangor, from RM 1,000.
What Is Wet Area Waterproofing?
It is the application of a waterproofing membrane or coating to bathroom floors and wet-area walls before tiling. This creates a watertight barrier that stops water from penetrating into the slab or adjacent walls.
Where Waterproofing Is Needed
- Bathroom floors — the most important wet area.
- Bathroom walls — around showers, tubs, and splash zones.
- Balconies and terraces — exposed to rain.
- Kitchens and laundry areas — where water is used.
- Wet bars — in larger homes.
When Do You Need Waterproofing?
- New bathroom renovation — before tiling, waterproofing should always be applied.
- Leaking to the floor below — water stains or damp on the ceiling beneath.
- Mould on bathroom walls — persistent moisture.
- Old waterproofing that has failed — after many years of use.
The Waterproofing Process
- Surface preparation — the floor and walls are cleaned, and cracks are repaired.
- Primer — a primer is applied to help the membrane bond.
- Membrane application — a waterproofing membrane or coating is applied to the required areas, including up the walls.
- Sealing corners and joints — vulnerable points are sealed with waterproof tape or sealant.
- Testing — the area is checked for coverage and readiness for tiling.
The work is usually done as part of a renovation before tiling, or as a targeted repair for an existing leak.
How Much Does Bathroom Waterproofing Cost?
Bathroom & wet area waterproofing starts from RM 1,000. The final cost depends on:
- The size of the bathroom
- The waterproofing method and material
- Whether existing tiles need removal
- Any necessary pipe or joint repair first
Frequently Asked Questions
Can I waterproof my bathroom without removing tiles?
If tiles are already installed and leaking, removing them is usually needed for a proper new membrane. In some cases, injection grouting can stop a specific leak without removing tiles.
How long does the membrane last?
A properly applied waterproofing membrane lasts many years. Its lifespan depends on material quality, installation, and the amount of use.
Should waterproofing be done before or after tiling?
Before tiling. The membrane goes on the slab and walls first, then tiles are laid over it. This creates a continuous watertight barrier.
Do you test the waterproofing?
Yes. We check coverage, sealing of corners and joints, and prepare the area correctly for tiling. Where possible, we verify the barrier is continuous before tiles go down.
Get a Bathroom Waterproofing Quote
Whether you are renovating a bathroom or fixing a leak to the floor below, KL Servis Rumah provides professional bathroom and wet area waterproofing across Kuala Lumpur and Selangor. WhatsApp us for a free assessment — chat with our team.