Bathroom waterproofing in Aljumum: before summer & rain season

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

What is specific about Aljumum for bathroom waterproofing

The centre of Aljumum sits about 200 m above sea level (SRTM open elevation data). 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..

Aljumum sits about 200 m above sea level, a fact that shapes how bathroom waterproofing should be planned here. Rain season and hot summer days both put stress on tile joints and wall junctions, and at this height the air can be drier and temperatures can swing more sharply between day and night, so sealants and coatings expand and contract more. For this reason, our work in Aljumum focuses on flexible membranes at wet-area joints and on checking old grout before any new layer goes on.

Because Aljumum sits about 200 m above sea level, the practical effect is that surfaces can move as temperatures change, so we pay close attention to corners, floor-to-wall junctions and around the shower tray. Bathroom waterproofing is quoted at SAR 15–40 per m², and the final figure depends on how much of the old surface must be cut back before the new layer can bond. Where cracks are visible, crack injection is priced at SAR 40–120 per metre, and we recommend treating these before any coating so that water does not travel behind the new finish.

Before summer and the rain season, the main practical step is to choose the right system for each surface. Epoxy coating is priced at SAR 35–90 per m² and suits tiled floors that see heavy use, while spray foam at SAR 20–45 per m² and bitumen membrane at SAR 15–35 per m² are common choices for wall and floor areas. Owners often avoid several common mistakes: skipping the crack check, applying a coating over damp or dusty concrete, rushing the drying time before the first use of the shower, and sealing only the visible tile while ignoring the drain edge. Booking the work early, before the first heavy rain, gives the membrane time to cure properly.

Checks before summer and before the rain season catch problems while they are still small.

Signs that call for bathroom waterproofing

These are the signs most often linked to bathroom waterproofing:

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

The most common causes

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

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.

Facts and costs — Aljumum

Questions from Aljumum

Common mistakes we see

• 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.