Bitumen membrane in Jubail: with a verifiable technical report

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

What is specific about Jubail for bitumen membrane

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..

Roof leaks are the most common complaint with bitumen membrane systems, and they usually start at laps, upturns against parapets, and around drains and roof penetrations rather than in the middle of the membrane. Where the sheet has not been bonded fully, or where the upstand is too short, water finds a path underneath and appears months later as a stain on the ceiling below. Surface ponding that lingers after rain is another early warning sign, because standing water speeds up ageing of the bitumen and hides the start of splits.

Jubail's location changes how this work should be approached. The centre of the town sits about 4 m above sea level, and the coast is only about 0.9 km away, so roofs here are exposed to salt-laden air and to wind-driven spray that can reach surfaces and edges. A membrane specified for a dry inland site may age faster in this setting, so the installer should check the condition of metal flashings, fixings and drain outlets as closely as the membrane itself. Low-lying sites also mean drainage outlets must stay clear, since slow runoff near the sea-side edges can back up quickly during heavy rain. Bitumen membrane typically falls within SAR 15–35 per m² for the work, and for a roof that is already slightly under-drained, that cost is better spent on correct falls and outlets than on a thicker sheet laid over the same problem.

Before the visit, ask the provider to state the exact scope in writing, including the area in m², the number of drains and upstands, and how the existing surface will be prepared. Ask for a written technical report that records the moisture check, the condition of each junction, and the drainage findings, and confirm that the report will be delivered before any work starts. Ask which other systems they would consider for this roof, such as liquid roof waterproofing at SAR 8–25 per m², and why they recommend one over the other. A clear answer on these points tells you whether the proposal is based on the actual roof or simply a standard quote.

Each job ends with a written report that carries a verification code you can check on our site.

When do you need bitumen membrane?

These are the signs most often linked to bitumen membrane:

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

Where the problem usually comes from

• Seams that were not welded properly — we check this before anything else.
• No protection layer — we check this before anything else.

Tools we use in Jubail

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.

Facts and costs — Jubail

Questions from Jubail

Common mistakes we see

• 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.