Bitumen membrane in Khobar: before summer & rain season

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

Before we start: what we know about Khobar

Team note on Khobar: 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.. Khobar is about 1.8 km from the sea coast (OpenStreetMap).

The centre of Khobar sits about 9 m above sea level (SRTM open elevation data).

Khobar sits on fairly low ground, with the centre about 9 m above sea level, and the coast is only about 1.8 km away. That combination matters for a bitumen membrane, because water that reaches a roof or podium at this elevation has little natural fall to carry it off quickly, and salty air drifting in from the coast can work into surfaces over time. So before any work starts, the first thing checked is whether the existing surface still drains toward its outlets and whether ponding is forming in the same places after rain. Those low spots tell a technician more about the state of the membrane than almost anything else, and they set the priorities for the job.

Some points can only be settled at the site visit. The technician needs to see the actual condition of the existing layer: whether it is blistered, split at the laps, or lifting at the parapet and along upstands. The age and number of previous layers, the type of substrate underneath, and whether the slab is sound enough to take a new torch-applied or self-adhesive sheet all depend on what is physically there. Access routes, the position of plant equipment, and any fixtures that must be worked around are also confirmed on the day. Anything that looks like a structural fault rather than a surface failure should be noted and reported before a membrane is chosen, because a new membrane laid over a moving or cracked slab will not last.

To help the technician arrive prepared, it is useful to know where water has been getting into the building, when the leaks appear, and whether they show up mainly after heavy rain or during the hotter months when the surface expands and contracts. Photos of the roof taken after a rain shower, notes on which rooms or ceilings are affected, and any earlier repair records are all valuable. Details of drainage outlets, their condition and whether they have been cleared recently should also be shared. With this information in hand, the visit can focus on confirming the problem areas rather than searching for them, which makes the quotation and the work plan more accurate for the building in question.

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

Signs that call for 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 we use in Khobar

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.

Khobar in facts and sources

Questions from Khobar

Mistakes that cost more

• 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.