Bitumen membrane for duplexes in Jeddah
In short: In Jeddah (Jeddah), bitumen membrane for duplexes begins with the roof, falls and drains survey and the flood test; nothing is opened until the position is clear. The centre of Jeddah sits about 15 m above sea level (SRTM open elevation data). Pricing starts from Bitumen membrane (per m²) (SAR 15–35 per m²), and other items are quoted after the visit.
Before we start: what we know about Jeddah
The centre of Jeddah sits about 15 m above sea level (SRTM open elevation data). Jeddah is about 2 km from the sea coast (OpenStreetMap).
Team note on Jeddah: 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..
Before any bitumen membrane is quoted for a duplex in Jeddah, the first check is the site's location. The centre of Jeddah sits about 15 m above sea level, according to SRTM open elevation data, and the city is about 2 km from the sea coast, according to OpenStreetMap. Those two facts shape how the roof and any below-ground areas are assessed, because the nearness of the coast and the city's relatively low elevation both affect how water and salt-laden air interact with exposed surfaces. The technician will therefore look first at how the roof falls, where water is likely to pond, and whether the parapet and upstands are sound enough to take a membrane turned up properly.
Several points can only be settled on the site visit. The technician needs to see the actual condition of the existing roof deck, the presence of any cracks or old patches, the state of drainage outlets, and whether an earlier coating is still bonded or has started to lift. The layout of the roof, including rooftop tanks, plant, and access stairs, will determine where the membrane must be detailed around penetrations. Whether the walls below the roof line show signs of damp is also judged on site, since this can point to a wider waterproofing problem that a roof membrane alone will not solve. Any crack that needs injection or sealing before the membrane goes down is measured and priced once it is visible.
To help the technician prepare, it is useful to have the roof area, the number of floors in the duplex, and any previous waterproofing records to hand. Photographs of the roof taken after rain, showing where water collects, are very helpful. Note whether a rooftop tank is in use and whether it has been coated internally, as tank work is priced separately from roof work. For a bitumen membrane in the range of SAR 15–35 per m², the final figure depends on the measured area and the preparation the site turns out to need. Clear access to the roof on the day of the visit also saves time and keeps the assessment accurate.
In a duplex, the two floors often share lines, so tests are done floor by floor.
When do you need bitumen membrane?
If you notice one of these signs in Jeddah, it is a good moment to talk to the team:
- A flat concrete roof that needs waterproofing
- Old rolls that are cracking
The most common causes
- No protection layer.
- A common cause: seams that were not welded properly.
Tools we use in Jeddah
| Tool | What it finds | When we use it in Jeddah |
|---|---|---|
| Roof, falls and drains survey | Ponding areas and the condition of the old layer | Limits: shows the condition, not the material alone |
| Flood test | Whether the waterproofing holds before it is covered | Limits: for roofs with drains and wet areas before tiling |
From the first visit to the report
- Preparation: Cleaning, priming and repairs.
- Torch welding: Overlaps are welded and checked.
- Details: Upstands, drains and bases.
- Protection and flood test: Protection is laid after a successful flood test.
Facts and costs — Jeddah
| Item | Value | Source |
|---|---|---|
| District profile | Jeddah is about 2 km from the sea coast (OpenStreetMap) | © OpenStreetMap contributors (ODbL) |
| District profile | The centre of Jeddah sits about 15 m above sea level (SRTM open elevation data) | SRTM (NASA) open data |
| District profile | Team note on Jeddah: 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. | Kashf team |
| Bitumen membrane (per m²) | SAR 15–35 per m² | Owner price list (Jeddah) |
Short answers for Jeddah
Can I use household chemicals instead of calling a technician?
Using unsuitable chemicals may corrode pipes and does not fix the root cause of the blockage, so it is better to rely on a specialist technician.
What is the difference between foam insulation and other types of insulation?
Foam insulation is easy to apply on uneven surfaces and forms one continuous layer with no joints, while other types, such as bitumen rolls, need the joints to be welded. The contractor decides which is most suitable after inspecting the site.
Can thermal insulation be applied to an existing building?
Yes, thermal insulation can be installed on the roofs and walls of existing buildings without the need for major structural modifications. The contractor prepares the surface, then applies the insulating material and the protective layer over it.
What is the first step of bitumen membrane for duplexes?
We start with preparation (cleaning, priming and repairs), then torch welding (overlaps are welded and checked).
How much does bitumen membrane cost in Jeddah?
From our published price list: Bitumen membrane (per m²) SAR 15–35 per m². Quantities are confirmed at the inspection.
What do I get at the end?
Photos of the welds and the flood-test result, in a technical report that carries a verification code.
Common mistakes we see
- Leaving the membrane exposed without protection
What you receive
The written output: photos of the welds and the flood-test result. The report is numbered and can be checked with its verification code.
Practical notes for residents of Jeddah
- Have access ready to the water meter, the tank hatches, the roof and the main valve; in apartment buildings the roof keys are often with the building guard (haris).
- Prices are in Saudi riyals (SAR); the final price is confirmed after the inspection, before any work starts.
- Keep photos of the problem and of any earlier repairs — they help the technician compare before and after.
- If you rent, tell your landlord or building management before the visit and agree in writing who pays; the written report can be shared with them.
Sources and method
- SRTM (NASA) open data
- © OpenStreetMap contributors (ODbL)
- Kashf team
- Customer questions (reviewed)
- Owner price list for Jeddah
- Local pages are published only after a quality gate: real local facts, text similarity of no more than 15% with any other English page, and a claims check.
- النسخة العربية