Bitumen membrane in Riyadh: before summer & rain season

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

What is specific about Riyadh for bitumen membrane

Team note on Riyadh: 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 Riyadh: King Fahd Road, King Abdullah Road, King Abdullah.

The centre of Riyadh sits about 637 m above sea level (SRTM open elevation data).

Bitumen membrane is the usual choice for flat roofs across Riyadh, and the most common problem we see on these roofs is water that stays ponded after rain and slowly works its way into the slab below. Standing water sits in low spots, the membrane ages faster under constant wetting, and small splits around parapets and drains become leaks that show up as stains on the ceiling. On a roof that has been exposed for years, the first sign is often a patch of darker membrane where water has been sitting, not a visible hole.

Local conditions shape how the work is planned. The centre of Riyadh sits about 637 m above sea level, so the city gets intense summer sun and dry heat that drives the surface temperature of a roof very high and makes the bitumen expand and harden over time. Rain season arrives in short, heavy bursts that can overwhelm drains within minutes. That combination means the survey should focus on heat-related cracking at upturns and joints, and on whether the falls toward drains are sufficient to clear water quickly. Bitumen membrane typically falls within a range of SAR 15–35 per m², but the real cost depends on how much of the existing layer must be stripped, how many drains and parapets need detailing, and whether insulation such as XPS boards, typically SAR 15–30 per m², is being added beneath the new membrane. Where the roof is also a leak source for the room below, crack injection at SAR 40–125 per metre may be needed on any cracks in the slab itself.

Before the visit, ask the provider to confirm which parts of the roof they will inspect, including drains, parapets and any ponding areas, and whether they will photograph the existing condition before work starts. Ask how they plan to handle the old membrane, whether they will remove it or lay over it, and what that means for the final price per m². Ask whether they will check for leaks in the rooms below, since the source is not always obvious from the roof surface. Finally, ask for a written quote that separates the membrane, any insulation, and any repair work, so you can compare the scope clearly before the summer heat and the rain season arrive.

Checks before summer and before the rain season catch problems while they are still small.

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

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

How we choose the tool in Riyadh

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 Riyadh

Short answers for Riyadh

Common mistakes we see

• Leaving the membrane exposed without protection

What you get after the work

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