Bathroom waterproofing for villas in Al Mrwj, Riyadh

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

Before we start: what we know about 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 service-area circle on the map below is drawn from this point. The nearest wadi channel is about 2.8 km from the centre of Al Mrwj (OpenStreetMap).

Main roads in or near Al Mrwj: King Fahd Road, Northern Ring Road, King Abdulaziz Road. The centre of Al Mrwj sits about 635 m above sea level (SRTM open elevation data).

Al Mrwj has both villas and apartment buildings.

Bathroom waterproofing in villas in Al Mrwj most often fails at the joints where the floor meets the wall and around the shower drain, because hot water and cleaning chemicals slowly break down the seal over time. In a villa, a leak in an upper-floor bathroom can travel down into rooms below, so the problem is usually discovered late. A well-planned job focuses on these weak points first, before any general coating is applied across the whole room.

Al Mrwj sits at about 635 m above sea level, with its centre at 24.7578, 46.6637, roughly 5 km from the centre of Riyadh. The nearest wadi channel lies about 2.8 km from the centre, so rainfall can run off the land quickly when it does arrive. For villas on this side of the city, that means the waterproofing needs to handle both daily moisture from bathroom use and the occasional heavy rain pushing against outer walls. Because the area includes both villas and apartment buildings, the approach for a standalone villa can differ from a unit in a shared block, where access to the floor below and the building's drainage shape the work. Costs for bathroom waterproofing in this area typically sit between SAR 15 and SAR 40 per m², while related options such as epoxy coating (SAR 35–95 per m²) and spray foam (SAR 20–45 per m²) are priced separately depending on the surface chosen.

Before the visit, ask the provider which membrane they plan to use and whether it is suited to the wet-area floor, the shower tray and the wall junctions. Ask how they will check the existing drain and whether any crack injection (SAR 40–125 per metre) is likely to be needed. Confirm whether the quote covers the sealing of pipe penetrations and the upstand height at the walls. It also helps to ask whether the work will be tested with water before tiling resumes, and how long the room should be kept out of use afterwards.

In a villa, tanks, the roof and the yard lines are usually yours to look after, so it helps to know where the main valve and tank hatches are.

Signs worth paying attention to

The following signs are worth checking before they grow:

• Worn grout
• Damp around the shower
• A stain under the bathroom on the floor below

Causes we see in the field

• A common cause: the area around the floor drain.
• A damaged floor layer — we check this before anything else.
• Corners without waterproofing tape.

How we choose the tool in Al Mrwj

How the work is done, step by step

1. Finding the source: A supply-pipe leak is ruled out first.
2. Preparation: The floor is opened and cleaned where needed.
3. Corners and details: Tape and detailing at corners, drains and pipe entries.
4. Flood test: The floor is tested before tiling.

Quick comparison: facts and costs in Al Mrwj

Questions from Al Mrwj

Common mistakes we see

• Waterproofing the floor while the supply pipe still leaks

The written outputs

The written output: the flood-test result and photos of each stage. The report is numbered and can be checked with its verification code.