Bitumen membrane for residential buildings in Jazan

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

Why bitumen membrane differs in Jazan

Team note on Jazan: 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 Jazan sits about 7 m above sea level (SRTM open elevation data).

Jazan is about 1.9 km from the sea coast (OpenStreetMap).

Bitumen membrane work in Jazan begins with the site's position. The centre of the city sits about 7 m above sea level, according to SRTM open elevation data, and the coast is about 1.9 km away, as recorded by OpenStreetMap. Because the roof and walls are close to the sea air, the first things a technician looks at are the exposed surfaces and the substrate that the membrane will bond to. A bitumen membrane for a residential roof is priced at SAR 15–35 per m², so the surface must be sound before any material is applied, and every crack or loose patch should be noted early.

Other checks depend on what is actually on site, and these are decided during the visit rather than in advance. The technician will look at the slope of the roof, the state of existing drainage outlets, the upstand heights at walls and parapets, and whether an old membrane is still bonded or needs to be removed. The condition of any cracks will decide whether crack injection, priced at SAR 40–120 per metre, is needed before the membrane goes down. Whether the building also needs a liquid roof layer at SAR 8–25 per m², or insulation boards at SAR 12–30 per m² under the finish, is also a site decision. None of these can be fixed by a general estimate, so they are left to the visit.

For the technician, a few points are worth bringing to the first visit. Record the roof area in square metres, the length of any cracks in metres, and the number of drains and penetrations such as vent pipes, aerials and water-tank connections, since each one needs careful detailing. Note whether the roof is accessible for foot traffic, whether the building has water storage on the roof, and whether the occupants will need to keep using the space during the work. Photographs of the roof surface, the parapets and any staining on the ceiling below will help the technician plan the materials and the sequence of work before arriving, which keeps the job predictable for both the household and the crew.

For a whole building, a survey of the shared systems comes before unit-by-unit work.

Signs worth paying attention to

If you notice one of these signs in Jazan, 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.
• A common cause: seams that were not welded properly.

Tools we use in Jazan

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 — Jazan

Common questions about bitumen membrane in Jazan

Mistakes that cost more

• Leaving the membrane exposed without protection

What you receive

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