Roof waterproofing in Jubail: for companies (annual contract)

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

What is specific about Jubail for roof waterproofing

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 problem we see on company buildings in Jubail, usually because the membrane has aged, flashings around vents and drains have lifted, or ponding water has been sitting on the surface for long periods. On commercial roofs the damage often stays hidden above suspended ceilings until stains appear in offices or storage areas, by which time the insulation below may already be wet. An annual contract lets a facilities team catch these faults early rather than reacting to a ceiling collapse or a stock write-off.

Local conditions shape how we approach the work. The centre of Jubail sits about 4 m above sea level, so drainage outlets and low roof sections need checking for standing water after heavy rain, because there is little natural fall to carry it away. Jubail is also about 0.9 km from the sea coast, so salt-laden air accelerates corrosion of metal flashings, fixings and access hatches. For most flat roofs we consider liquid roof waterproofing, typically SAR 8–25 per m², which suits irregular shapes and areas with many penetrations. Bitumen membrane, at SAR 15–35 per m², is an option where a heavier, traditional layer is preferred. Where a roof is sealed but the building also has water tanks, tank internal coating at SAR 25–60 per m² can be scheduled under the same agreement.

Before the visit, ask for the roof plan showing drains, plant curbs and previous repair locations, and ask when the roof last had a full inspection. Confirm whether the contract covers routine checks, minor crack repairs and emergency call-outs, and whether crack injection at SAR 40–120 per m is priced separately. Ask which areas are occupied during work so that noisy or fume-producing tasks can be planned around staff. Finally, request a written schedule of inspections so you know exactly what will be checked, and when, each year.

For companies, an annual contract sets the scope, the visit schedule and the reports in writing.

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

Causes we see in the field

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

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.

Jubail in facts and sources

Questions from Jubail

Common mistakes we see

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

The written outputs

You receive: a quality record with photos and the flood-test result, in a technical report with a verification code.