Bathroom waterproofing for duplexes in Alula

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

Bathroom waterproofing in Alula: the local context

Main roads in or near Alula: King Abdullah Road. The centre of Alula sits about 697 m above sea level (SRTM open elevation data).

Bathroom waterproofing for duplexes in Alula starts with the floor and the wall junctions, because these are the places where water most often finds a way through. The centre of Alula sits about 697 m above sea level (SRTM open elevation data), so the technician checks the drainage slope on the bathroom floor first, making sure the fall runs toward the floor drain rather than pooling near the door. Bathroom waterproofing is typically quoted at SAR 15–40 per m², and that range reflects how much preparation the surface needs before any membrane goes on. Corners, pipe penetrations and the joint between tiles and the wall are inspected before any material is chosen.

Some matters are left to the site visit, because they cannot be judged from a description alone. The technician looks at the condition of the existing screed, whether there are hairline cracks that need crack injection (SAR 40–120 per metre), and whether the slab below shows signs of damp that would point to a larger problem. Whether a liquid membrane, a bitumen layer or a spray foam system suits the room depends on the substrate, the access available and how the bathroom is used day to day. Costs for epoxy coating (SAR 35–90 per m²) or spray foam (SAR 20–45 per m²) are only sensible to compare once the surface has been assessed on site.

Information that helps the technician is worth gathering before the visit. Note the age of the duplex, any previous leaks or repairs, and whether the bathroom sits above a living space, a neighbour or a shared stairwell. Tell the technician which fixtures are fitted, such as a shower tray, a bath or a wet-room layout, and whether tiles are already laid. Photographs of the floor, the skirting and any visible staining make the first visit more productive. Clear access to the bathroom and an agreed time for water testing will let the technician confirm the result before the room is returned to use.

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

Signs that call for bathroom waterproofing

These are the signs most often linked to bathroom waterproofing:

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

Causes we see in the field

• The area around the floor drain — we check this before anything else.
• A common cause: a damaged floor layer.
• A common cause: corners without waterproofing tape.

Tools we use in Alula

From the first visit to the report

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 — Alula

Common questions about bathroom waterproofing in Alula

Common mistakes we see

• Waterproofing the floor while the supply pipe still leaks

The written outputs

The written output: the flood-test result and photos of each stage. The report is numbered and can be checked with its verification code.