Bathroom waterproofing for residential buildings in Aldarb

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

Before we start: what we know about Aldarb

Aldarb is about 18.7 km from the sea coast (OpenStreetMap). The centre of Aldarb sits about 79 m above sea level (SRTM open elevation data).

Is bathroom waterproofing worth doing in an apartment block in Aldarb, and what will it actually cost? Aldarb sits about 79 m above sea level and roughly 18.7 km from the coast, so the town is inland and not on the shoreline. Bathroom waterproofing for residential buildings here is typically priced at SAR 15–40 per m², which keeps the work affordable compared with heavier jobs. Owners usually pay for it when tiles begin to lift, when damp spreads onto neighbouring walls, or before a bathroom is refitted. The figure applies to the membrane and its application across the bathroom floor and the lower wall areas, so measuring the room accurately is the first step to a clear estimate.

Before any work begins, the inspection looks at where water is entering and whether the existing surface can take a new layer. The technician checks floor falls toward the drain, the condition of grout and silicone joints, and the junctions where walls meet the floor. Any cracks are noted, and where a crack runs through a wall, crack injection is priced at SAR 40–120 per metre, so the length of visible cracking is recorded. The inspector also tests for dampness behind the tiles at a few points and measures the floor area in square metres. Together these readings show whether a simple membrane will do or whether the substrate needs preparing first.

Owners can make the visit faster and the quote more accurate by preparing a few things in advance. Clear the bathroom floor, remove bath mats, toiletries and any loose fittings, and make sure the drain and shower outlet are reachable. Note when the leak or damp was first noticed and whether it appears after showers, after rain, or all the time, since this helps locate the source. If the flat is occupied, arrange access to the bathroom at an agreed time and let the neighbours below know if the works could affect their ceiling. Having the building's plan or the room measurements to hand also saves time on site.

For a whole building, a survey of the shared systems comes before unit-by-unit work.

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

The most common causes

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

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.

Aldarb in facts and sources

Short answers for Aldarb

Mistakes that cost more

• Waterproofing the floor while the supply pipe still leaks

What you receive

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