Bitumen membrane for offices & commercial complexes in Alkharj

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

Before we start: what we know about Alkharj

Team note on Alkharj: 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.. Main roads in or near Alkharj: King Abdullah Road.

The centre of Alkharj sits about 439 m above sea level (SRTM open elevation data).

The most common problem with bitumen membrane on office and commercial roofs in Alkharj is water ponding and seepage at the edges, upstands and drainage outlets, where a membrane that looks sound on the surface begins to leak once water sits in low spots for long periods. On large commercial complexes, the roof is often wide and flat, so small failures at joints, parapets and penetrations for air conditioning units and pipes can travel unseen into ceilings and floors below before anyone notices a stain. Bitumen membrane is priced at SAR 15–35 per m², and that range reflects how much preparation, primer and lapping work a particular roof needs before the membrane goes down.

The centre of Alkharj sits about 439 m above sea level, which shapes how we approach these roofs. At that elevation, the surrounding terrain and the building's drainage fall must be checked carefully, because rainwater runs off in particular directions and collects where the slope is weakest. Our approach begins with a survey of falls and outlets, then a decision on whether the existing surface can take a new bitumen layer or needs to be cleared first. Where roofs are used alongside other works, such as liquid roof waterproofing at SAR 8–25 per m² for lighter areas or XPS boards at SAR 12–30 per m² for insulation beneath protection layers, we match the system to the zone rather than applying one product across the whole building.

Before the visit, ask the provider to confirm how they will assess ponding and drainage, not just the membrane itself, and whether the quote separates surface preparation, membrane supply and edge detailing so you can see where the cost sits. Ask which areas of the roof will be inspected for existing leaks, how access to occupied floors will be managed during work, and how the membrane will be lapped and sealed at upstands and penetrations. It also helps to ask whether the job covers the basement or tank areas if they are part of the same complex, since those need different materials and are priced separately. Clear answers to these questions will tell you whether the plan fits your building.

For offices and commercial complexes, work is scheduled to avoid disrupting staff and visitors.

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

The most common causes

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

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.

Alkharj in facts and sources

Questions from Alkharj

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.