Bathroom waterproofing for duplexes in Alqunfudhah

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

Before we start: what we know about Alqunfudhah

Team note on Alqunfudhah: 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.. Alqunfudhah is about 0.4 km from the sea coast (OpenStreetMap).

The centre of Alqunfudhah sits about 7 m above sea level (SRTM open elevation data).

Picture a family who has just bought a duplex in Alqunfudhah. The upper floor is finished and the bathrooms look fine, but within a year the ceiling below the upstairs shower shows a damp patch, and the tiles near the floor drain feel soft underfoot. They are not sure whether the problem is the building, the pipes, or simply bad luck. For owners of duplexes in this kind of setting, a damp bathroom is rarely a single fault. It is usually a sealing problem that has been slowly letting water through the floor and walls.

The local facts explain why this matters here. The centre of Alqunfudhah sits about 7 m above sea level and lies roughly 0.4 km from the sea coast. That combination means the air is humid and salty for much of the year, which speeds up corrosion of fixings and draws moisture into porous surfaces. A bathroom in a duplex is exposed to daily splashing, steam and water that runs toward the drain, so the seal at the floor edge and around the shower tray carries most of the load. Bathroom waterproofing in this area typically costs SAR 15–40 per m², while epoxy coating runs SAR 35–90 per m² and spray foam SAR 20–45 per m², so owners can choose a level of protection that fits both the wet zone and the budget.

For a practical approach, start by stripping any loose tiles and soft screed around the drain and along the wall line where damp appears. Next, repair any cracks, which can cost SAR 40–120 per metre to inject, before the surface is dry and clean. Then apply the waterproofing layer, taking it up the walls at least to the height of the shower area and turning it into the drain properly. Allow the membrane or coating to cure fully before tiling. Finally, check the ceiling below after the first heavy use of the shower and note any changes, so small leaks are caught early rather than becoming a repair bill later.

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 damaged floor layer.
• Corners without waterproofing tape.

Tools and methods, and when we use them

How the work is done, step by step

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 — Alqunfudhah

Short answers for Alqunfudhah

What we advise against

• 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.