Roof waterproofing for duplexes in Al Rwda, Riyadh

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

Roof waterproofing in Al Rwda: the local context

The centre of Al Rwda is at 24.7341, 46.7672, about 9.6 km from the centre of Riyadh, with an approximate radius of 2.9 km. The approximate area shown on the map is centred here. Main roads in or near Al Rwda: Eastern Ring Road, Khurais Road, Makkah Road.

The centre of Al Rwda sits about 622 m above sea level (SRTM open elevation data). Al Rwda is mainly apartment buildings.

Al Rwda sits at 24.7341, 46.7672, about 9.6 km from the centre of Riyadh, with an approximate radius of 2.9 km. Its position a short drive from the city centre means that duplex owners here are close to the busy commercial core, yet the district itself is quieter and more residential. Crews can usually reach a property without long delays, which helps keep a roof job on schedule once materials are on site. The area is mainly apartment buildings, so many duplexes share a roof line with neighbouring blocks, and any waterproofing work needs to be planned around the building above and beside it. Access to the roof through shared stairs or a common terrace is often the first thing to confirm before work starts.

The centre of Al Rwda sits about 622 m above sea level (SRTM open elevation data). At this height, roofs experience strong sun, wide temperature swings between day and night, and dry, dusty air that wears down surface coatings over time. For that reason, the choice of membrane matters. Liquid roof waterproofing is priced at SAR 10–25 per m², bitumen membrane at SAR 15–35 per m², and XPS boards at SAR 15–30 per m², and each system copes differently with heat and expansion. A surface that sheds sun and moves with daily temperature change tends to last longer on an exposed duplex roof than one that cracks as the surface warms and cools.

Owners in the district often avoid a few common mistakes. They do not wait until a small leak becomes a damp ceiling, because cracks left unsealed let water track into the structure below. They do not paint over a damp or dusty surface, since coatings need a clean, dry base to bond. They also avoid treating the roof in isolation: where a duplex has a water tank or a basement, the connected areas should be assessed together, with tank internal coating at SAR 25–65 per m² and crack injection at SAR 40–125 per metre handled as part of the same plan. Asking for a clear breakdown of area and method before work begins helps prevent surprises later.

In a duplex, the two floors often share lines, so tests are done floor by floor.

When do you need roof waterproofing?

These are the signs most often linked to roof waterproofing:

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

Where the problem usually comes from

• Cracks in the roof slab.
• A common cause: wrong falls towards the drains.
• Damaged waterproofing around tank and AC bases.

Tools we use in Al Rwda

How the work is done, step by step

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.

Facts and costs — Al Rwda

Short answers for Al Rwda

What we advise against

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

The written outputs

You receive: a quality record with photos and the flood-test result, in a technical report with a verification code.