Bathroom waterproofing for residential buildings in Aljumum

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

What is specific about Aljumum for bathroom waterproofing

Team note on Aljumum: 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 centre of Aljumum sits about 200 m above sea level (SRTM open elevation data).

Is bathroom waterproofing worth doing in an older apartment building in Aljumum? For most owners, the answer depends on whether water is already getting where it should not. The centre of Aljumum sits about 200 m above sea level, and that matters for planning: a building at this height is not a basin where water collects, so the main concern is seepage through floor slabs, wall joints and shower areas rather than rising groundwater. Bathroom waterproofing for residential work typically falls in the range of SAR 15–40 per m², which makes it one of the more affordable protective measures compared with basement waterproofing at SAR 50–150 per m². Costs for related materials also vary, with epoxy coating at SAR 35–90 per m² and spray foam at SAR 20–45 per m², so the choice of system should follow what the inspection shows.

The inspection begins with a walk through the bathroom and the rooms directly below it, looking for staining, peeling paint, soft plaster or a musty smell. The technician then checks floor falls toward the drain, the condition of tile grout and silicone at the wall and tray junctions, and any hairline cracks in the screed. Where a crack runs through the substrate, crack injection is priced at SAR 40–120 per metre, and that step is confirmed on site rather than assumed. Moisture readings are taken at several points so the report reflects actual conditions. The findings are then explained in plain terms, with the recommended system and the reason for it, so the owner can decide before any work starts.

Before the visit, clear the bathroom floor and the wall areas to be checked, and move any stored items away from the walls. Note when leaks were first noticed, whether they appear after showers or only after rain, and which neighbour's unit sits directly above or below. If you have earlier repair records or photographs of damp patches, have them ready to share. Access to the flat below may also be needed, so arrange that in advance. Good preparation lets the inspection focus on the cause of the problem rather than on finding it.

For a residential building, shared risers, tanks and pumps are checked as one system.

When do you need bathroom waterproofing?

The following signs are worth checking before they grow:

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

Where the problem usually comes from

• The area around the floor drain.
• A common cause: 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 — Aljumum

Common questions about bathroom waterproofing in Aljumum

What we advise against

• 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.