Roof waterproofing in Al Flah, Riyadh: before buying or handover

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

Before we start: what we know about Al Flah

The centre of Al Flah is at 24.7963, 46.7088, about 9.8 km from the centre of Riyadh, with an approximate radius of 1.9 km. The service-area circle on the map below is drawn from this point. The centre of Al Flah sits about 645 m above sea level (SRTM open elevation data).

Main roads in or near Al Flah: Northern Ring Road, Airport Road, Northern Ring Road.

Roof leaks are the most common problem with flat roofs in Al Flah, and they usually show up as damp patches on top-floor ceilings after the first heavy rain. Cracks in the screed, failed joints around parapets and drains, and surfaces that have lost their protective coating are the usual causes. For a buyer or a new occupant, the time to deal with this is before handover, while the defects are still easy to trace and the warranty questions are still open.

The local facts shape the approach. The centre of Al Flah sits at 24.7963, 46.7088, about 9.8 km from the centre of Riyadh, with an approximate radius of 1.9 km, so the area is compact and well inside the city's built-up footprint. It also sits about 645 m above sea level, which is the altitude reported by SRTM open elevation data. Because the area is sited at that height and roofs carry the full force of the sun, the membrane is exposed to heat and UV, so the right material matters. Liquid roof waterproofing typically costs SAR 10–25 per m², bitumen membrane SAR 15–35 per m², and spray foam SAR 20–45 per m², and the choice should reflect how the roof is used and how much movement the slab is likely to show. A roof with a shallow fall that holds water needs a different plan from one that drains quickly, so the surveyor should look at the falls as well as the surface.

Before the visit, ask the seller or landlord for the history of any roof works, the date of the last recoat, and any written records of leaks. Ask whether the roof has been walked on for storage or plant, since that wears coatings faster. Ask for access to the roof on a dry day and again after rain if possible. Request a site visit with a checklist that covers cracks, ponding, parapet joints, drain outlets and the junction with the stair housing. Where a quotation is needed, ask for the rate per m² and the scope in writing so that you can compare the offer with the ranges above and avoid surprises at handover.

Before buying or taking over a property, an inspection gives you findings in writing before you sign.

When do you need roof waterproofing?

If you notice one of these signs in Al Flah, it is a good moment to talk to the team:

• Stains on the top-floor ceiling after rain
• Water pooling on the roof
• The old waterproofing is cracking

The most common causes

• Damaged waterproofing around tank and AC bases — we check this before anything else.
• A common cause: wrong falls towards the drains.
• Cracks in the roof slab — we check this before anything else.

How we choose the tool in Al Flah

From the first visit to the report

1. Survey: Falls, drains and the condition of the old layer are recorded.
2. Preparation: Cleaning and repairs before any new layer.
3. Primer: The base coat that the system needs.
4. Waterproofing layers and details: Corners, upstands and bases get their own detail.
5. Flood test: The roof is flooded and checked before it is covered.

Al Flah in facts and sources

Questions from Al Flah

What we advise against

• Covering the waterproofing before the flood test
• Ignoring the tank bases

What you receive

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.