Floor & balcony waterproofing for schools in Alrass

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

Floor & balcony waterproofing in Alrass: the local context

Team note on Alrass: 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.. Main roads in or near Alrass: King Abdulaziz Road, King Fahd Road, King Salman Road.

The centre of Alrass sits about 695 m above sea level (SRTM open elevation data).

Floor and balcony waterproofing in schools most often fails at the junctions: where the floor slab meets the wall, around drain outlets, and at the edges of balconies and corridor canopies. Water collects there during rain and seeps down, and in a school the damage tends to appear in classrooms and corridors below, which then has to be closed off for repairs during term. Hairline cracks in the slab are the usual starting point, and a small crack that goes unnoticed for a season can lead to staining, lifting finishes, and damp patches that spread along the wall.

In Alrass, the centre sits about 695 m above sea level, so the site is on a plateau rather than a low basin, and rainfall runs off and collects in the same predictable places around the building. A good approach here starts with mapping where water actually travels across the roof, balcony and walkways, then targeting the drainage points and joints first. Where cracks are active, crack injection is priced per metre at SAR 40–120 per m, and the work is scoped to the length actually found rather than estimated from the outside. For balcony and flat roof areas, liquid roof waterproofing at SAR 8–25 per m² or a bitumen membrane at SAR 15–35 per m² are common options, and the choice depends on the surface condition, foot traffic and how many days the area can be out of use. Epoxy coating, at SAR 35–90 per m², suits floors that need a hard-wearing finish, while spray foam at SAR 20–45 per m² suits surfaces with awkward shapes.

Before the visit, ask the provider to confirm which areas will be inspected and whether the survey covers drainage outlets, wall junctions and balcony edges, not only the flat surfaces. Ask how the work will be phased so classrooms and walkways stay usable, and what the school should clear or cover in advance. Ask for the quantity basis for each option, whether it is per m² or per metre, so you can compare quotes on the same terms. Finally, ask how the surface will be checked after curing and who the school should contact if a crack reappears during the first rainy season.

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

When do you need floor & balcony waterproofing?

If you notice one of these signs in Alrass, it is a good moment to talk to the team:

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

The most common causes

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

Tools we use in Alrass

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.

Alrass in facts and sources

Questions from Alrass

What we advise against

• Tiling a balcony without waterproofing

What you get after the work

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