Roof waterproofing for apartments in Jubail

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

Roof waterproofing in Jubail: the local context

Team note on Jubail: 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 Jubail sits about 4 m above sea level (SRTM open elevation data).

Jubail is about 0.9 km from the sea coast (OpenStreetMap).

Roof leaks are the most common complaint in apartment buildings in Jubail, and they usually start small: a hairline crack near a parapet, a blistered sealant at a drain outlet, or a patch of ceiling staining on the top floor that appears after rain. In an apartment block, the roof is shared, so a leak that starts over one flat often travels down through several floors before anyone reports it. Early attention is far cheaper than repairing ceilings, walls and fittings after water has spread.

The local setting changes how we approach the job. The centre of Jubail sits about 4 m above sea level, and the town is about 0.9 km from the sea coast. That means roofs here are exposed to salt-laden air and to the same wind and heat as the coast, and drainage has little height to work with, so ponding water is more likely to sit on the surface. Because of this, the work normally starts with a close look at falls and outlets, not just the visible cracks. Liquid roof waterproofing is priced at SAR 8–25 per m², bitumen membrane at SAR 15–35 per m², and XPS boards at SAR 12–30 per m², so the choice depends on the roof's condition, access and how much insulation the flat below needs. Where cracks run through the surface, crack injection is priced at SAR 40–120 per metre and is often used before any full coating goes on.

Before the visit, ask for a clear description of what has been noticed: where the stains appear, whether they worsen after rain, and whether ponding water stays for long periods. Ask whether the roof is used for water tanks, air-conditioning units or access by residents, since these affect the layout of the work. Ask how the quote is measured, per square metre for the roof area and per metre for any crack injection, and whether the figures include the surface preparation needed before coating. Finally, ask who will be responsible for the shared roof, since the repair is usually decided by the building as a whole and not by a single flat owner.

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

Signs that call for roof waterproofing

The following signs are worth checking before they grow:

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

Where the problem usually comes from

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

How we choose the tool in Jubail

How the work is done, step by step

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.

Facts and costs — Jubail

Common questions about roof waterproofing in Jubail

Common mistakes we see

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

What you receive

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.