Bitumen membrane in Jazan: without breaking

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

Bitumen membrane in Jazan: the local context

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).

Jazan sits low and close to the coast. The centre of the city is about 7 m above sea level, and it lies roughly 1.9 km from the sea. Because of this, a bitumen membrane job here starts with a check of the ground and the slab rather than the price list. Before any material is laid, the technician looks at whether the surface is sound, whether there are cracks or old patches, and whether water already moves through the structure. Low ground and salty air mean that moisture tends to reach a roof or a basement wall from more than one direction, so the first questions are about where water can enter and where it is likely to sit.

Several parts of the job depend on what is found on the day. The exact condition of the substrate, the slope needed for drainage, the position of pipes, outlets and upstands, and the state of any old membrane are judged only at the site visit. The same applies to the width and depth of cracks and whether they need injection before the membrane goes down. The rate for the work is not fixed by these notes alone: a bitumen membrane is quoted per square metre in a range of SAR 15–35 per m², and where the work sits within that range depends on what the inspection reveals. Other options such as liquid roof waterproofing at SAR 8–25 per m² or XPS boards at SAR 12–30 per m² are also weighed against the site, not chosen from a table.

For the technician, the most useful information is a clear record of the roof or area, its access, and any past leaks, with photographs where possible. Note whether the building is near the coast, whether there is standing water after rain, and which surfaces are used daily. If the job includes a tank or basement, say so early, because those are priced separately, with tank internal coating at SAR 25–60 per m² and basement waterproofing at SAR 50–150 per m². Shared facts about the site help the visit go faster and make the final scope match what the building really needs.

The aim is to locate the cause with instruments first, so any opening is limited to one point.

Signs that call for bitumen membrane

These are the signs most often linked to bitumen membrane:

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

The most common causes

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

Tools and methods, and when we use them

From the first visit to the report

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.

Jazan in facts and sources

Common questions about bitumen membrane in Jazan

What we advise against

• Leaving the membrane exposed without protection

What you get after the work

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