Bitumen membrane in Najran: preventive periodic check
In short: In Najran (Najran), bitumen membrane (preventive periodic check) begins with the roof, falls and drains survey and the flood test; nothing is opened until the position is clear. The centre of Najran sits about 1309 m above sea level (SRTM open elevation data). Published price: Bitumen membrane (per m²), SAR 15–35 per m²; anything else is quoted after the inspection.
Why bitumen membrane differs in Najran
Main roads in or near Najran: Al Jarba Street. The centre of Najran sits about 1309 m above sea level (SRTM open elevation data).
Team note on Najran: 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..
Consider a homeowner in Najran who has a flat concrete roof on a villa and has never thought much about it. Life is busy, the roof looks fine from the street, and the first sign of trouble is often a stain on a ceiling after a heavy shower. By then, water has usually been travelling through the structure for some time. A bitumen membrane is one of the most common ways to keep that water out, and it works best when it is checked on a regular schedule rather than only after a leak appears.
The city sits about 1309 m above sea level, which means the climate here brings strong sun during the day and sharp temperature swings between day and night. Those swings make materials expand and contract, and over time this can open small splits in the membrane, particularly at edges, joints and where pipes or parapets meet the roof. Because the altitude and sun combined put steady stress on the surface, a periodic preventive check is more sensible than waiting for water to show. Small repairs found early tend to be far simpler than rebuilding a damaged section of roof.
A practical routine starts with a visual walk-over of the whole roof once a year, looking for blisters, bare patches, loose laps and cracks around drains and upstands. Next, clear debris, leaves and sand from drains and gutters so water moves freely instead of pooling. Then check the areas most likely to fail, such as corners, the junction with walls and any spot where foot traffic or equipment has scuffed the surface. Mark each defect and note its location. Where the membrane has split, plan a patch or a full section repair. Bitumen membrane repairs are typically priced at SAR 15–35 per m², so get a clear quote for the area involved before work begins. Finally, keep a simple written record of each check and repair, so you can see how the roof is changing over the years.
Preventive checks follow a written schedule instead of waiting for a fault.
When do you need bitumen membrane?
The following signs are worth checking before they grow:
- Old rolls that are cracking
- A flat concrete roof that needs waterproofing
Causes we see in the field
- Seams that were not welded properly.
- No protection layer — we check this before anything else.
Tools and methods, and when we use them
| Tool | What it finds | When we use it in Najran |
|---|---|---|
| Flood test | Whether the waterproofing holds before it is covered | Limits: for roofs with drains and wet areas before tiling |
| Roof, falls and drains survey | Ponding areas and the condition of the old layer | Limits: shows the condition, not the material alone |
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.
Najran in facts and sources
| Item | Value | Source |
|---|---|---|
| District profile | The centre of Najran sits about 1309 m above sea level (SRTM open elevation data) | SRTM (NASA) open data |
| Roads | Main roads in or near Najran: Al Jarba Street | Kashf data (owner) |
| District profile | Team note on Najran: 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 (Najran) |
Questions from Najran
What is the first step of bitumen membrane (preventive periodic check)?
We start with preparation (cleaning, priming and repairs), then torch welding (overlaps are welded and checked).
How much does bitumen membrane cost in Najran?
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
You receive: photos of the welds and the flood-test result, in a technical report with a verification code.
If you live in Najran and are new to the area
- 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.
- 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.
Sources and method
- SRTM (NASA) open data
- Kashf data (owner)
- Kashf team
- Owner price list for Najran
- 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