Bathroom waterproofing for duplexes in Aldarb

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

What is specific about Aldarb for bathroom waterproofing

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

Is bathroom waterproofing in a duplex in Aldarb worth the cost, and what does it actually involve? Aldarb sits about 79 m above sea level and roughly 18.7 km from the sea coast, so the town is not on the low ground where water collects, but damp from shower use and leaking floors can still cause real damage to a duplex over time. For bathrooms, the typical rate is SAR 15–40 per m², which covers the floor and wall areas that get wet every day. Owners who also have a basement or a water tank should know that those jobs are priced separately, at SAR 50–150 per m² for basements and SAR 25–60 per m² for tank internal coatings.

The inspection begins with a walk through the bathroom and the rooms directly below it, looking for stains, soft plaster, lifting tiles and hairline cracks in the floor. The technician then checks the joints around the shower tray, the drain and the wall corners, since these are the most common points of water entry. Where a crack is visible, the team can quote crack injection at SAR 40–120 per metre. The surface is measured so the quote reflects the true wet area, and the inspector notes whether the existing layer is intact enough to be coated over or needs to be removed first. Options such as epoxy coating at SAR 35–90 per m² or spray foam at SAR 20–45 per m² are discussed based on what the inspection finds.

Before the visit, clear the bathroom floor and the area under the sink so the technician can reach the drain and the walls. Note any past leaks, when they happened and which room they affected, and have the water bill for the last few months ready in case it shows an unexplained rise. If the duplex has a roof terrace with a bathroom or utility room below it, mention that too, because liquid roof waterproofing at SAR 8–25 per m² is often quoted alongside bathroom work. Keeping the access route to the upper floor open will let the inspection finish in one visit.

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

Signs that call for bathroom waterproofing

The following signs are worth checking before they grow:

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

Where the problem usually comes from

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

Tools and methods, and when we use them

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.

Quick comparison: facts and costs in Aldarb

Short answers for Aldarb

Mistakes that cost more

• Waterproofing the floor while the supply pipe still leaks

What you get after the work

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