Roof waterproofing in Jubail: before summer & rain season

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

Why roof waterproofing differs in Jubail

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 waterproofing in Jubail starts with the location itself. The centre of Jubail sits about 4 m above sea level (SRTM open elevation data), and the town is about 0.9 km from the sea coast (OpenStreetMap). That closeness to the coast means salt-laden air and humidity reach rooftops, so the first checks focus on surface condition, salt staining, and any sign that the existing membrane has lifted or lost adhesion. Before any price is considered, the technician looks at whether the roof drains properly, since standing water in a low-lying area is the fastest way for a failing membrane to leak.

Some points can only be settled on site. The exact slope of the roof, the number and state of drain outlets, the depth of cracks, and whether the substrate is sound enough to take a new layer are all judged by eye and by touch once the surface is cleared. Options such as liquid roof waterproofing, bitumen membrane, or XPS boards are chosen only after these conditions are known. Typical ranges quoted for liquid roof waterproofing are SAR 8–25 per m², bitumen membrane SAR 15–35 per m², and XPS boards SAR 12–30 per m², but the final method and area are confirmed during the visit. Where a crack runs through the roof, crack injection is priced at SAR 40–120 per metre, and that figure is only applied once the crack has been measured.

To help the technician arrive prepared, note the roof's access route, any water tanks or rooftop equipment that must be lifted or protected, and the date of the last waterproofing work if you know it. Mention any ceiling stains or damp patches below, as these show where water has already travelled. Clear loose items from the roof surface and let the technician know if the roof is in regular use, such as for drying laundry or storing materials. Good information at this stage shortens the visit and makes the recommended work more accurate before the rain season or the summer heat arrives.

Checks before summer and before the rain season catch problems while they are still small.

When do you need roof waterproofing?

These are the signs most often linked to roof waterproofing:

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

The most common causes

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

Tools we use in Jubail

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.

Facts and costs — Jubail

Questions from Jubail

What we advise against

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

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.