Bitumen membrane for apartments in Aljumum

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

Why bitumen membrane differs in Aljumum

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.. The centre of Aljumum sits about 200 m above sea level (SRTM open elevation data).

Is a bitumen membrane the right choice for an apartment building in Aljumum? For many owners the first question is cost, and the honest answer depends on the work involved. Bitumen membrane for roofs and podiums is priced at SAR 15–35 per m², which places it in the middle of the range among the waterproofing systems we cover. Liquid roof waterproofing is lower at SAR 8–25 per m², while basement waterproofing runs SAR 50–150 per m². Aljumum sits at a fair height, with the centre about 200 m above sea level, so exposed rooftops and terraces here are worth checking carefully before you choose a system.

Before any material is recommended, a technician walks the property and looks at the surfaces that will take the membrane. The inspection starts with the roof or podium, checking for ponding, cracks, old patches and any lifting at the edges. Where cracks are found, crack injection is quoted separately at SAR 40–120 per metre, so the length of each defect is measured and recorded. The area of the bitumen membrane is then calculated in square metres so the estimate follows the real surface rather than a rough guess. Drains, outlets and upstands are noted, since these are the usual places where water finds a way through. The technician also records whether the building has a water tank on the roof, because tank internal coating is a separate item priced at SAR 25–60 per m².

To help the visit go smoothly, gather the building's basic details before the technician arrives. Have the roof access arrangements ready, including who holds the key and whether the building management needs notice. Bring any earlier waterproofing records, invoices or photographs showing previous repairs, since these reveal where past leaks occurred. Note any signs of damp in the apartments below the roof, such as stains on ceilings or peeling paint, and mention when they first appeared. Clear loose items from the roof and the area around the access point so the surface can be walked and measured properly. Finally, decide in advance whether you want the work limited to the roof or extended to other areas such as bathrooms or a basement, so the inspection covers what you need.

In apartment buildings, the floor below is often where a leak shows first.

When do you need bitumen membrane?

If you notice one of these signs in Aljumum, it is a good moment to talk to the team:

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

Causes we see in the field

• A common cause: seams that were not welded properly.
• No protection layer — 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.

Aljumum in facts and sources

Common questions about bitumen membrane in Aljumum

What we advise against

• 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.