Roof waterproofing for apartments in Almajmaah

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

Roof waterproofing in Almajmaah: the local context

The centre of Almajmaah sits about 720 m above sea level (SRTM open elevation data). Main roads in or near Almajmaah: King Abdullah Road, King Fahd Road, King Salman Road.

Team note on Almajmaah: Kashf teams serve this city and its nearby districts with the same documented inspection standard: device-based leak detection without demolition, a written report, and a clear scope before any work begins..

The most common roof problem in apartment buildings in Almajmaah is water entering through the top floor ceiling after rain, usually from cracked screeds, failed joints around parapets and drains, and old membranes that have lost their grip. Because the flat roof is shared by several households, leaks often show up in the flat below before anyone knows who is responsible for the work, so it helps to agree on the repair scope with the building owner or management early.

The local setting changes how the work is approached. The centre of Almajmaah sits about 720 m above sea level (SRTM open elevation data), so the roof is exposed to the open sky and to strong daily sun and temperature swings, which stress older coatings and make cracks grow. For that reason a contractor may compare a liquid roof waterproofing system, which typically costs SAR 8–25 per m², with a bitumen membrane at SAR 15–35 per m², and may suggest crack injection at SAR 40–120 per metre for narrow splits in the screed. Where the roof also has a water tank, tank internal coating at SAR 25–60 per m² may be discussed separately, as it is a different job from the roof surface. Ask which option suits the condition you see rather than assuming one product fits every roof.

Before the visit, ask the provider to confirm exactly which area is covered, whether the price is quoted per m² and how many square metres they have measured, and whether the work includes preparing and cleaning the surface, repairing cracks and sealing parapets and drains. Ask what they will do about the flat below, how the building will be accessed during the work and whether they will photograph the roof before and after. Request a written quotation that lists each item separately so you can compare it with other offers, and check that the crack injection and membrane figures match the scope you agreed.

In apartment buildings, the floor below is often where a leak shows first.

Signs worth paying attention to

These are the signs most often linked to roof waterproofing:

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

Where the problem usually comes from

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

How we choose the tool in Almajmaah

The steps in order

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.

Almajmaah in facts and sources

Common questions about roof waterproofing in Almajmaah

Mistakes that cost more

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

What you get after the work

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