Bitumen membrane in Aljumum: for companies (annual contract)

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

What is specific about Aljumum for bitumen membrane

The centre of Aljumum sits about 200 m above sea level (SRTM open elevation data). Team note on Aljumum: 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 waterproofing for company buildings in Aljumum usually comes down to one recurring problem: water finding its way through roof slabs and parapet junctions after the first heavy rains, then pooling against the membrane and slowly lifting its laps. For offices, warehouses and small industrial sites on an annual contract, this shows up as staining on top-floor ceilings and wet insulation, often noticed only once the damage has already spread. Aljumum sits about 200 m above sea level, so the centre is not a low-lying basin where runoff gathers from every direction. That makes drainage outlets and slope to the drains the first thing to check, because water here tends to move quickly across a roof and can concentrate at outlets and corners rather than sitting evenly over the whole surface.

Because of that height and local drainage pattern, the approach for a bitumen membrane job starts with the outlets, upstands and any existing crack lines before any new sheet is laid. Membrane is typically priced at SAR 15–35 per m², and the work is scoped by the area of roof covered plus the detailing around drains, pipes and edges. On a company contract, it makes sense to plan the work in phases so that occupied floors below are protected during the removal of old layers. Where the roof is shared with rooftop plant or storage, the layout should be agreed before the first sheet is fixed, so that access routes and load points are not damaged afterwards.

Before the visit, ask the provider to confirm the total roof area you want quoted and whether the price covers old membrane removal or only the new layer. Ask how the annual contract handles inspections after heavy rain, what the response process is for leaks between scheduled visits, and whether the drainage outlets will be cleaned as part of the same job. Request a written breakdown of the membrane rate per m² and any separate charges for crack repair or edge detailing, so that you can compare the offer against other options such as liquid roof waterproofing at SAR 8–25 per m² where it suits the roof condition. Having this information ready will make the site survey faster and the final quote easier to check.

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

When do you need 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.
• Seams that were not welded properly — we check this before anything else.

How we choose the tool in Aljumum

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.

Facts and costs — Aljumum

Common questions about bitumen membrane in Aljumum

Mistakes that cost more

• 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.