Roof waterproofing for apartments in Yanbu

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

Before we start: what we know about Yanbu

Main roads in or near Yanbu: King Abdulaziz Road, Umluj Road, Al Hanan Street. Team note on Yanbu: 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..

Yanbu is about 1.2 km from the sea coast (OpenStreetMap). The centre of Yanbu sits about 6 m above sea level (SRTM open elevation data).

Roof leaks are the most common waterproofing problem in apartment buildings in Yanbu, and they usually show up as damp patches on the top-floor ceiling after rain or as cracks where the roof surface meets parapets and drainage outlets. Over time, water that gets under the surface weakens the concrete and can reach the flat below. For apartment blocks, where several households share one roof, a leak often affects more than one unit, so early repair is important.

Yanbu's location shapes how we approach these roofs. The centre of the city sits about 6 m above sea level, and the coast is about 1.2 km away, so the roof surfaces face a coastal, salt-laden air environment that can slowly break down exposed coatings. Because the land is low and flat, drainage outlets must be kept clear so rainwater does not pool on the surface. For most apartment roofs we look first at the surface and the joints, then choose a system that suits the roof's condition. Liquid roof waterproofing typically falls in the range of SAR 8–25 per m², bitumen membrane in the range of SAR 15–35 per m², and spray foam in the range of SAR 20–45 per m². Where a roof has heavy cracking, crack injection is priced at SAR 40–120 per metre.

Before the visit, it helps to have a few details ready. Tell us how many storeys the building has, whether the roof is used for water tanks or outdoor units, when leaks were first noticed, and whether they appear only after heavy rain or all year. Note any cracks you have seen and where the damp patches are inside the apartment. Also check whether the building's management or owners' committee needs to approve work on a shared roof, since this can affect scheduling. With these details, the site visit can focus on the real cause of the leak rather than only the visible stain.

In apartment buildings, the floor below is often where a leak shows first.

When do you need roof waterproofing?

The following signs are worth checking before they grow:

• The old waterproofing is cracking
• Water pooling on the roof
• Stains on the top-floor ceiling after rain

The most common causes

• Cracks in the roof slab — we check this before anything else.
• A common cause: wrong falls towards the drains.
• Damaged waterproofing around tank and AC bases.

Tools and methods, and when we use them

The steps in order

1. Survey: Falls, drains and the condition of the old layer are recorded.
2. Preparation: Cleaning and repairs before any new layer.
3. Primer: The base coat that the system needs.
4. Waterproofing layers and details: Corners, upstands and bases get their own detail.
5. Flood test: The roof is flooded and checked before it is covered.

Yanbu in facts and sources

Questions from Yanbu

Mistakes that cost more

• Ignoring the tank bases
• Covering the waterproofing before the flood test

The written outputs

The written output: a quality record with photos and the flood-test result. The report is numbered and can be checked with its verification code.