Floor & balcony waterproofing for schools in Aljumum

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

Floor & balcony waterproofing in Aljumum: the local context

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).

The centre of Aljumum sits about 200 m above sea level, according to SRTM open elevation data, and that height shapes where water tends to collect and how it drains from school floors and balconies. Before any quote is written, the technician first checks how rainwater runs off the roof and balcony slabs, whether drains and outlets are clear, and whether any standing water has left staining or lifted finishes at the edges. Because school buildings are used by many people and often have long open balconies, the first question is always where water is entering and where it has nowhere to go.

Several things are left for the site visit, because they cannot be judged from a description alone. The technician will look at the condition of existing cracks and whether crack injection is needed at SAR 40–120 per metre, and will decide between liquid roof waterproofing at SAR 8–25 per m², a bitumen membrane at SAR 15–35 per m², or spray foam at SAR 20–45 per m² based on the actual surface. Epoxy coating at SAR 35–90 per m² and XPS boards at SAR 12–30 per m² are considered only once the substrate and the use of the area are clear. Any basement, bathroom or water tank area is assessed separately, with basement waterproofing at SAR 50–150 per m², bathroom waterproofing at SAR 15–40 per m², and tank internal coating at SAR 25–60 per m² each priced only after inspection.

To help the technician prepare, it is useful to have the school's floor plan or roof layout, the approximate area of each balcony and floor section in square metres, and a note of any leaks, damp patches or past repairs. Access times that suit the school day, and any restrictions on noise, materials or working near pupils, should be shared in advance. Photographs of drains, edges and cracks taken after rain are especially helpful, because they show the water path that the crew needs to understand before work begins.

For schools, the larger jobs are planned for weekends and holidays.

Signs worth paying attention to

These are the signs most often linked to floor & balcony waterproofing:

• A wrong fall towards the door threshold
• Water passing from the balcony to the floor below
• Damp under the light well

Where the problem usually comes from

• Incorrect falls.
• A threshold without waterproofing — we check this before anything else.
• A blocked drain.

Tools and methods, and when we use them

How the work is done, step by step

1. Checking the falls: Where water collects and where it should go.
2. Details: Thresholds, drains and upstands.
3. Waterproofing: The layer is applied and protected.
4. Flood test: Tested before the finish goes on.

Quick comparison: facts and costs in Aljumum

Short answers for Aljumum

Mistakes that cost more

• Tiling a balcony without waterproofing

The written outputs

You receive: the flood result and photos of the details, in a technical report with a verification code.