Floor & balcony waterproofing for schools in Khafji

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

Floor & balcony waterproofing in Khafji: the local context

Main roads in or near Khafji: King Abdullah Road. Team note on Khafji: 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..

Khafji is about 2 km from the sea coast (OpenStreetMap). The centre of Khafji sits about 9 m above sea level (SRTM open elevation data).

The head teacher of a small primary school in Khafji is responsible for a building that is used every day by children, staff and visitors. Over time, the floors of the washrooms, the corridors and the open balconies on the upper levels start to show signs of wear: a hairline crack near a drain, a patch of damp on a ceiling below, or a surface that no longer sheds water as it should. Such problems rarely appear all at once, so the owner tends to notice them only after water has already moved into the structure.

The local facts matter here. The centre of Khafji sits about 9 m above sea level, and the town is about 2 km from the sea coast. A site this close to the coast is exposed to salt-laden air and to the moisture that comes with it, so surfaces and joints can deteriorate faster than they would inland. Because the ground is only a few metres above sea level, water that cannot drain away quickly tends to stay around the building's base and edges. For a school, where floors are cleaned often and balconies collect rainwater, these conditions make a sound waterproofing system especially worthwhile.

Start by walking the floors and balconies after a rain and marking every damp patch, ponding area and crack, noting where water enters and where it runs. Next, decide which areas need which treatment: bitumen membrane or liquid roof waterproofing for open roofs and balconies, epoxy coating or bathroom waterproofing for wet rooms, and crack injection for any structural lines that leak. Then confirm the surface is clean, dry and free of loose material before any product goes on, since adhesion depends on preparation. Apply the chosen system in the order the work requires, letting each layer cure fully before the next. Finally, schedule a repeat inspection after the first heavy rainfall, and keep a simple log of any new marks so that small problems are caught before they spread.

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:

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

Causes we see in the field

• A blocked drain — we check this before anything else.
• A common cause: incorrect falls.
• A common cause: a threshold without waterproofing.

Tools we use in Khafji

The steps in order

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.

Facts and costs — Khafji

Short answers for Khafji

Mistakes that cost more

• Tiling a balcony without waterproofing

What you receive

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