Roof waterproofing in Al Mrwj, Riyadh: without breaking
In short: In Al Mrwj (Riyadh), roof waterproofing (without breaking) begins with the roof, falls and drains survey and the moisture meter for ceilings and walls; nothing is opened until the position is clear. Al Mrwj has both villas and apartment buildings. Pricing starts from Liquid roof waterproofing (per m²) (SAR 10–25 per m²), and other items are quoted after the visit.
Why roof waterproofing differs in Al Mrwj
The centre of Al Mrwj is at 24.7578, 46.6637, about 5 km from the centre of Riyadh, with an approximate radius of 2.1 km. The approximate area shown on the map is centred here. Main roads in or near Al Mrwj: King Fahd Road, Northern Ring Road, King Abdulaziz Road.
The nearest wadi channel is about 2.8 km from the centre of Al Mrwj (OpenStreetMap). Al Mrwj has both villas and apartment buildings.
The centre of Al Mrwj sits about 635 m above sea level (SRTM open elevation data).
Al Mrwj sits around 5 km from central Riyadh, close to the coordinates 24.7578, 46.6637, and its main roads include King Fahd Road, the Northern Ring Road and King Abdulaziz Road. Most buildings here are villas and apartment blocks, which means many roofs are flat, reinforced slabs with multiple penetrations for water tanks, AC units and parapets. Because the area sits at about 635 metres above sea level and roughly 2.8 km from the nearest wadi channel, rainfall runoff is a real concern during heavy storms, so the first check is always the existing drainage outlets and slope before any membrane is laid.
For a roof waterproofing job, the team starts by surveying the surface for cracks, blistered coatings and ponding areas, then traces the water path from the slab to the drains and checks the parapet and roof-edge flashing. This order matters because a membrane applied over a blocked outlet or a failing parapet will fail early, no matter how well it is installed. The work is planned to avoid disturbing the rooms below, using methods chosen for the roof itself rather than demolition.
Before the visit, gather any previous waterproofing records, the building's age, and notes on past leaks, including the rooms where stains appeared and when they occurred. Clear access to the roof, the water tank area and the stairwell, and note any rooftop installations the team should work around. Ask the team to explain the proposed surface preparation, the drainage fixes included, how the membrane will be protected from foot traffic, and what inspection they will do once the work is finished.
The aim is to locate the cause with instruments first, so any opening is limited to one point.
Signs worth paying attention to
If you notice one of these signs in Al Mrwj, it is a good moment to talk to the team:
- The old waterproofing is cracking
- Stains on the top-floor ceiling after rain
- Water pooling on the roof
The most common causes
- Cracks in the roof slab — we check this before anything else.
- A common cause: damaged waterproofing around tank and AC bases.
- Wrong falls towards the drains.
Tools and methods, and when we use them
| Method | What it helps with | Its role in Al Mrwj |
|---|---|---|
| Roof, falls and drains survey | Ponding areas and the condition of the old layer | Limits: shows the condition, not the material alone |
| Moisture meter for ceilings and walls | Where water is entering now, from inside | Limits: measures the effect, not the water path |
| 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
- Survey: Falls, drains and the condition of the old layer are recorded.
- Preparation: Cleaning and repairs before any new layer.
- Primer: The base coat that the system needs.
- Waterproofing layers and details: Corners, upstands and bases get their own detail.
- Flood test: The roof is flooded and checked before it is covered.
Facts and costs — Al Mrwj
| Item | Value | Source |
|---|---|---|
| District profile | The centre of Al Mrwj sits about 635 m above sea level (SRTM open elevation data) | SRTM (NASA) open data |
| District profile | The nearest wadi channel is about 2.8 km from the centre of Al Mrwj (OpenStreetMap) | © OpenStreetMap contributors (ODbL) |
| District profile | Al Mrwj has both villas and apartment buildings | Kashf data (owner) |
| Centre of Al Mrwj | 24.75776, 46.66367 | © OSM |
| Distance from the centre of Riyadh | about 5 km | Calculated from the coordinates |
| Roads | Main roads in or near Al Mrwj: King Fahd Road, Northern Ring Road, King Abdulaziz Road | Kashf data (owner) |
| Liquid roof waterproofing (per m²) | SAR 10–25 per m² | Owner price list (Riyadh) |
| Bitumen membrane (per m²) | SAR 15–35 per m² | Owner price list (Riyadh) |
Common questions about roof waterproofing in Al Mrwj
Is Al Mrwj within our service area in Riyadh?
The centre of Al Mrwj is at 24.7578, 46.6637, about 5 km from the centre of Riyadh. The exact address of your property is set when you book.
What is the first step of roof waterproofing (without breaking)?
We start with survey (falls, drains and the condition of the old layer are recorded), then preparation (cleaning and repairs before any new layer).
How much does roof waterproofing cost in Al Mrwj?
From our published price list: Liquid roof waterproofing (per m²) SAR 10–25 per m²; Bitumen membrane (per m²) SAR 15–35 per m². Quantities are confirmed at the inspection.
What do I get at the end?
A quality record with photos and the flood-test result, in a technical report that carries a verification code.
Mistakes that cost more
- Covering the waterproofing before the flood test
- Ignoring the tank bases
The written outputs
The written output: a quality record with photos and the flood-test result. The report is numbered and can be checked with its verification code.
Planning the visit in Al Mrwj
- You can message us on WhatsApp in English; the booking details are sent back to you in the chat to confirm before the visit.
- The Saudi weekend is Friday and Saturday; mention your preferred day and time when booking.
- Prices are in Saudi riyals (SAR); the final price is confirmed after the inspection, before any work starts.
- 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).
Sources and method
- © OpenStreetMap contributors (ODbL)
- Kashf data (owner)
- SRTM (NASA) open data
- Owner price list for Riyadh
- 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