Bitumen membrane for schools in Yanbu

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

Before we start: what we know about Yanbu

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

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

Before any quote is given for a bitumen membrane on a school roof in Yanbu, the first thing checked is the site's position relative to the coast. The centre of Yanbu sits about 6 m above sea level, according to SRTM open elevation data, and the city is about 1.2 km from the sea coast, based on OpenStreetMap. Those two facts matter because they shape how exposed the roof is to salt-laden air and how water is likely to drain off during heavy rain. A roof close to the shoreline and only a few metres above sea level will be treated with extra attention to membrane laps, edge details and drainage outlets, since standing water and salt exposure are both more likely to affect the surface over time.

Several things are deliberately left to the site visit. The technician needs to see the current condition of the roof, including any blistering, cracking, ponding or previous repairs, and to decide whether the existing layers can be overlaid or need to be stripped back. The number of penetrations such as vents, pipes and access hatches, the state of parapets and upstands, and the slope of the roof all change the scope of work and cannot be judged from a description alone. Where the building joins a higher wall or another roof level, the technician will also check how the membrane should be terminated. Any cost depends on the measured area and these conditions, so no figure is given here without that inspection.

To help the technician prepare, the school should have available the approximate roof area, the age of the building, and any records of earlier waterproofing work or leaks. Note when leaks were last noticed and in which rooms, and whether they appeared during rain or after it had stopped. Access arrangements matter too: confirm when the roof can be reached without disturbing lessons, and whether any rooftop equipment needs to be moved or protected. Clear information at this stage makes the visit quicker and the proposal more accurate for the school.

For schools, the larger jobs are planned for weekends and holidays.

When do you need bitumen membrane?

If you notice one of these signs in Yanbu, it is a good moment to talk to the team:

• A flat concrete roof that needs waterproofing
• Old rolls that are cracking

Where the problem usually comes from

• No protection layer.
• Seams that were not welded properly.

Tools we use in Yanbu

How the work is done, step by step

1. Preparation: Cleaning, priming and repairs.
2. Torch welding: Overlaps are welded and checked.
3. Details: Upstands, drains and bases.
4. Protection and flood test: Protection is laid after a successful flood test.

Yanbu in facts and sources

Short answers for Yanbu

What we advise against

• Leaving the membrane exposed without protection

The written outputs

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