Bathroom waterproofing for duplexes in Aldawadmi

Prepared by the technical team · editorial review · last updated 13 November 2026 · Sources

Before we start: what we know about Aldawadmi

The centre of Aldawadmi sits about 976 m above sea level (SRTM open elevation data). Main roads in or near Aldawadmi: King Abdulaziz Road, Dawadmi Bujadiyah Road.

Team note on Aldawadmi: Kashf teams serve this city and its nearby districts with the same documented inspection standard: device-based leak detection without demolition, a written report, and a clear scope before any work begins..

The most common problem we see in duplex bathrooms in Aldawadmi is water tracking through the floor and walls into the unit below, usually because the wet area was never sealed properly or the seal has broken down over time. Duplexes often have a bathroom stacked directly above a neighbour's living space or kitchen, so a small leak can stain ceilings and damage finishes before anyone notices. Early signs include soft or discoloured patches on the ceiling below, tiles that sound hollow, and grout that stays damp long after showering. Bathroom waterproofing in this service is typically priced at SAR 15–40 per m², and a proper job starts with checking the existing surface rather than simply adding a new layer on top.

The centre of Aldawadmi sits about 976 m above sea level, which matters for how a bathroom floor is prepared. At this elevation, temperature swings between day and night can be noticeable, and repeated expansion and contraction can open hairline cracks in screeds and at the junction between floor and wall. For that reason we pay close attention to cracks before any coating goes down, and where a crack is present, crack injection (SAR 40–120 per metre) is considered as a separate step. Epoxy coating (SAR 35–90 per m²) and spray foam (SAR 20–45 per m²) are both options for wet areas, and the right choice depends on the condition of the substrate, the slope to the drain, and how much use the bathroom gets. A duplex bathroom shared by a busy household needs a different approach from a guest bathroom used now and then.

Before the visit, it helps to have a few details ready. Tell us which floor the bathroom is on, whether the unit below is occupied, and whether you have noticed any staining, cracking or hollow tiles. Let us know if the bathroom was tiled recently or if the old waterproofing layer is still in place, since this changes how much preparation is needed. It is also useful to mention whether there is a shower tray or a walk-in floor, and where the floor drain sits. With this information, the visit can focus on the real cause of the problem and give you a clear picture of the work involved before anything is agreed.

In a duplex, the two floors often share lines, so tests are done floor by floor.

Signs worth paying attention to

These are the signs most often linked to bathroom waterproofing:

• A stain under the bathroom on the floor below
• Damp around the shower
• Worn grout

Causes we see in the field

• Corners without waterproofing tape.
• A damaged floor layer.
• The area around the floor drain.

Tools and methods, and when we use them

The steps in order

1. Finding the source: A supply-pipe leak is ruled out first.
2. Preparation: The floor is opened and cleaned where needed.
3. Corners and details: Tape and detailing at corners, drains and pipe entries.
4. Flood test: The floor is tested before tiling.

Facts and costs — Aldawadmi

Questions from Aldawadmi

Mistakes that cost more

• Waterproofing the floor while the supply pipe still leaks

The written outputs

You receive: the flood-test result and photos of each stage, in a technical report with a verification code.