Floor & balcony waterproofing in Aljumum: without breaking

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

Before we start: what we know about Aljumum

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..

Picture a homeowner in Aljumum who has noticed a faint damp patch spreading across the ceiling of the balcony below, or a hairline crack running along the edge of a floor tile. The property is a few years old, the family uses the balcony every evening, and nobody wants to move furniture out for weeks while crews dig up the surface. What this owner needs is a repair that stops water getting in without turning the home into a building site.

The centre of Aljumum sits about 200 m above sea level, according to SRTM open elevation data. For a homeowner that height matters less as a number than as a reminder that rainwater runs off the surrounding slopes and collects where it can. Water that finds an entry point through a floor joint or a balcony edge will keep working into the structure over time. The practical lesson is to treat small signs early, because a crack that costs a modest amount to inject today can become a much larger job once moisture has spread. Costs also vary by method: crack injection is priced at SAR 40–120 per metre, liquid roof waterproofing at SAR 8–25 per m², and spray foam at SAR 20–45 per m², so matching the method to the actual problem keeps the budget sensible.

Start by walking the balcony and floor after rain and marking every crack, stain, or soft spot with a pencil. Next, decide whether the problem is a single line of movement, which usually suits crack injection, or a wider area that needs a membrane or coating. Ask the contractor to explain which method they recommend and why, and to quote per square metre or per metre so you can compare like with like. Where the work is on an open roof or terrace, a liquid roof waterproofing system or XPS boards for insulation may suit the job. Keep furniture and plants clear of the work zone, arrange for the area to stay dry until the coating has fully cured, and check the finished surface after the next heavy rain before signing off the work.

The aim is to locate the cause with instruments first, so any opening is limited to one point.

When do you need floor & balcony waterproofing?

The following signs are worth checking before they grow:

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

The most common causes

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

Tools and methods, and when we use them

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 — Aljumum

Questions from Aljumum

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.