Bitumen membrane in Jazan: for companies (annual contract)

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

Why bitumen membrane differs in Jazan

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).

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..

Bitumen membrane roofing in Jazan usually starts with a problem that companies see again and again on flat roofs: the membrane lifts or blisters where it meets upstands, drains and roof edges, and water finds its way through small gaps. On commercial buildings the roof is often large, busy with air-conditioning units and foot traffic, and the membrane is expected to last for years without repeated patching. The first step in any proper job is to find where the existing covering has failed, not just to lay a new sheet over the top. For this property type the cost is usually priced per square metre, with bitumen membrane typically falling in the range of SAR 15–35 per m², but the real cost depends on how much preparation and repair the roof needs before the new layer goes down.

Jazan sits about 7 m above sea level in the centre of the city and roughly 1.9 km from the coast. That combination means the roofs are not right on the water, yet they are close enough that salt-laden air can reach the surface, which matters for the adhesives, the laps and the protective finish. Because the city is low and near the sea, drainage around the building and on the roof deserves a careful look. Ponding water is the enemy of any bitumen system, so the approach is to check falls, outlets and gutters before choosing the thickness and the number of layers. Where a roof is already heavily used, the layout of the new membrane should keep pipes, units and walkways in mind so that the finished surface stays protected.

Before the visit, a company manager should be ready to answer a few practical questions. Tell the crew the roof area, the type of existing covering, how old it is, and where leaks have appeared inside the building, since those details shape the scope and the price. Ask whether the price covers removal of the old material, edge and upstand work, drain treatment and a final check of the finished surface. Ask how the annual contract handles inspections, small repairs between major jobs, and what happens if a new leak appears after the work is complete. A clear written scope makes it far easier to compare offers and to keep the roof dry for the long term.

For companies, an annual contract sets the scope, the visit schedule and the reports in writing.

When do you need bitumen membrane?

The following signs are worth checking before they grow:

• 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.

How we choose the tool 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.

Quick comparison: facts and costs in Jazan

Questions from Jazan

Mistakes that cost more

• Leaving the membrane exposed without protection

What you receive

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