Roof waterproofing for apartments in Ahad Almasarihah

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

Before we start: what we know about Ahad Almasarihah

The centre of Ahad Almasarihah sits about 667 m above sea level (SRTM open elevation data). Team note on Ahad Almasarihah: 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..

Ahad Almasarihah sits about 667 m above sea level, which places it in the upland part of the Jazan region rather than on the coast. For roof work, this height matters because the sun and open sky exposure on rooftops can be strong, and temperature swings between day and night can stress coatings over time. Owners in this area should expect roof surfaces to be exposed to heat and sudden rain, and that is why the choice of membrane and its maintenance schedule deserve careful planning before any work begins.

The practical effect on our service is that roof waterproofing for apartment buildings here is usually planned around the common options on the price list. Liquid roof waterproofing is priced at SAR 8–25 per m², while bitumen membrane is SAR 15–35 per m², and XPS boards are SAR 12–30 per m². Each option suits a different roof condition, so the survey step comes first. Where cracks are visible, crack injection at SAR 40–120 per metre is often added so that the repair is sealed before the new surface goes on. Because the elevation means rooftops are fully exposed, a surface that is cleaned, dried and free of loose material will bond better and last longer than one applied over dust or old debris.

Owners in apartment blocks commonly make a few avoidable mistakes. The first is choosing the lowest per-square-metre quote without checking which product is being used, since the range across the roof options is wide. The second is ignoring small cracks and ponding water, which allow moisture to reach the upper floors and can later spread to bathrooms and tanks that may need separate work such as bathroom waterproofing at SAR 15–40 per m² or tank internal coating at SAR 25–60 per m². The third is skipping a roof inspection after heavy rain, which can reveal problems early. Planning a single, well-prepared job for the roof, and linking it to any nearby waterproofing needs, helps residents avoid repeat expenses.

In an apartment, a problem may start in your unit or in a shared line; we separate the two before any work.

Signs worth paying attention to

The following signs are worth checking before they grow:

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

Causes we see in the field

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

Tools and methods, and when we use them

From the first visit to the report

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 — Ahad Almasarihah

Questions from Ahad Almasarihah

What we advise against

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

What you receive

The written output: a quality record with photos and the flood-test result. The report is numbered and can be checked with its verification code.