Bathroom waterproofing for rest houses & farms in Al Mrwj, Riyadh

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

Bathroom waterproofing in Al Mrwj: the local context

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. Al Mrwj has both villas and apartment buildings.

The centre of Al Mrwj sits about 635 m above sea level (SRTM open elevation data). 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).

Bathroom waterproofing in rest houses and farms in Al Mrwj most often fails at the floor-to-wall junction and around the shower area, where water sits longest and seeps behind tiles into the block. Rest houses and farms tend to have heavy seasonal use, with bathrooms opened after long closures and then used by many guests in a short time, so small gaps that a single household would notice late can turn into damp patches within weeks. The work usually starts by stripping loose tiles at the affected edges, checking the screed for hollow sounds, and sealing the junctions before any new finish goes down. Bathroom waterproofing in this area is usually priced between SAR 15 and SAR 40 per m², and spray foam or liquid membranes at the lower end of the scale are common where the surface is small and access is simple.

Al Mrwj sits at about 635 m above sea level, roughly 5 km from the centre of Riyadh, and its centre lies at 24.7578, 46.6637 within an approximate radius of 2.1 km. The nearest wadi channel is about 2.8 km from the centre, so properties in the lower, flatter parts of the area can see water collect after heavy rain and rising damp from the ground. Because the area has both villas and apartment buildings, the same fault can present differently: a villa often needs work on a ground-floor bathroom and its outdoor wet areas, while an apartment may need coordination with neighbours below if leakage travels through the slab. Where a farm or rest house has a water tank on site, tank internal coating in the range of SAR 25 to SAR 65 per m² may also be relevant, and any basement or lower-level room may call for basement waterproofing at SAR 55 to SAR 160 per m².

Before the visit, ask the provider to confirm the exact bathroom area in m², the number of wet zones, and whether the leak source has been traced or only the visible stain is being treated. Ask whether the price covers tile removal, surface preparation, the membrane or coating itself, and reinstatement of finishes, and whether crack injection at SAR 40 to SAR 125 per metre is needed for any wall cracks. Ask also how long the area must stay out of use after the work, and whether the site is near the wadi channel or in a low point that may need drainage checks. Clear answers to these questions make the quote easier to compare and the scope of work easier to hold the contractor to.

Rest houses and farms often have long buried lines, tanks and irrigation that need separate tests.

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:

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

Causes we see in the field

• A common cause: corners without waterproofing tape.
• A damaged floor layer.
• The area around the floor drain.

Tools and methods, and when we use them

From the first visit to the report

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.

Facts and costs — Al Mrwj

Common questions about bathroom waterproofing in Al Mrwj

Common mistakes we see

• Waterproofing the floor while the supply pipe still leaks

What you get after the work

You receive: the flood-test result and photos of each stage, in a technical report with a verification code.