Bathroom waterproofing in Al Mhmdya, Riyadh: emergency

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

Bathroom waterproofing in Al Mhmdya: the local context

The centre of Al Mhmdya is at 24.7326, 46.6503, about 3.3 km from the centre of Riyadh, with an approximate radius of 2 km. The service-area circle on the map below is drawn from this point. The nearest wadi channel is about 1.9 km from the centre of Al Mhmdya (OpenStreetMap).

The centre of Al Mhmdya sits about 625 m above sea level (SRTM open elevation data). Main roads in or near Al Mhmdya: King Fahd Road, King Abdullah Road, Al Takhassusi Road.

Bathroom leaks in Al Mhmdya usually start at the same weak points: the junction between the shower floor and the wall, the pipe penetrations through the tiles, and hairline cracks at the floor-to-wall corner where the screed has moved. In an emergency the water often shows first in the room below or along the skirting, which is why a bathroom job can look like a ceiling or basement problem. The most common fix is a fresh waterproof membrane under new tiling, and bathroom waterproofing in this area is typically priced at SAR 15–40 per m², with crack injection quoted separately at SAR 40–125 per metre.

Al Mhmdya sits at about 625 m above sea level, roughly 3.3 km from the centre of Riyadh, and its centre lies at 24.7326, 46.6503. The nearest wadi channel runs about 1.9 km from the centre, so on heavy rain days groundwater and surface runoff can push against lower floors and the walls of older buildings. Because of this, a technician working here should check whether the leak is coming from inside the bathroom or from water pressing in from outside, since the second case needs a different approach. When the water is coming up from below or through a basement wall, basement waterproofing at SAR 55–160 per m² may be the right scope rather than a bathroom-only repair.

Before the visit, ask the provider to confirm whether they will inspect the source of the leak as well as the bathroom floor, and whether the quote covers the membrane, the crack injection and the making-good of the tiles. Ask how they will handle water already inside the room, and whether they will test the repair with a flood test before any new tiles are laid. Ask too whether the price is per square metre of the treated area and whether any extra scope, such as tank or roof work, would be charged separately. Clear answers to these questions will help you compare quotes and avoid surprises once the emergency work begins.

If water is flowing, close the main valve first, then call or message with photos.

When do you need bathroom waterproofing?

These are the signs most often linked to bathroom waterproofing:

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

Causes we see in the field

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

Tools and methods, and when we use them

The steps in order

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 Mhmdya

Questions from Al Mhmdya

Mistakes that cost more

• Waterproofing the floor while the supply pipe still leaks

What you get after the work

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