Bitumen membrane for schools in Jubail

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

Bitumen membrane in Jubail: the local context

Jubail is about 0.9 km from the sea coast (OpenStreetMap). The centre of Jubail sits about 4 m above sea level (SRTM open elevation data).

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..

Does a school roof in Jubail really need a bitumen membrane, and what will it cost? The centre of Jubail sits about 4 m above sea level, and the town is about 0.9 km from the sea coast, so roofs here are exposed to salt-laden air and strong coastal conditions. A bitumen membrane is one of the waterproofing options used on flat roofs, and it is priced in our range at SAR 15–35 per m². The final figure for a school depends on the roof area, its condition and the access arrangements, so the range is a starting point rather than a quote.

Before any work is scoped, the inspection walks the full roof surface and the parapets, checks the drainage outlets for blockage, and looks for ponding, cracks, lifted edges and any old membrane that has aged or split. The inspector also notes where the roof meets walls, rooftop units and pipe penetrations, since these joints are common points of leakage. Where a crack is found, the repair is priced separately as crack injection at SAR 40–120 per metre, and the inspector records its length so it can be included in the estimate. The result is a written description of the roof's condition, the areas that need attention, and the membrane options that suit them.

Staff can make the visit smoother by arranging access to the roof in advance, clearing loose items and equipment from the roof area, and telling the inspector about any past leaks, including the rooms where water appeared and when. A list of previous repairs and any existing roof warranty papers is also useful. If the school plans to use the roof during term time, agree on quiet hours or a safe route to the roof so classes are not disturbed. Having these details ready lets the inspector focus on the roof itself and gives the school a clear, accurate picture of what the bitumen membrane work will involve.

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

When do you need bitumen membrane?

The following signs are worth checking before they grow:

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

Causes we see in the field

• A common cause: seams that were not welded properly.
• No protection layer.

How we choose the tool in Jubail

The steps in order

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.

Facts and costs — Jubail

Questions from Jubail

Common mistakes we see

• Leaving the membrane exposed without protection

The written outputs

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