Roof waterproofing in Aljumum: preventive periodic check

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

Roof waterproofing in Aljumum: the local context

Team note on Aljumum: 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 centre of Aljumum sits about 200 m above sea level (SRTM open elevation data).

The first thing checked on a roof in Aljumum is the drainage and the roof surface itself, because the centre of Aljumum sits about 200 m above sea level (SRTM open elevation data), and that elevation shapes how water moves across a flat roof. A technician looks for ponding, blocked outlets, and any slope that holds water after rain. Standing water is the usual starting point for leaks, so clearing outlets and checking falls comes before any decision about coatings or membranes.

Some things cannot be judged from a checklist and are left to the site visit. The technician walks the roof to find cracks, blistering, lifted edges at parapets, and wear around pipes and fixtures, and decides whether the existing layer can be repaired or needs stripping. Price depends on the method chosen after that inspection. For reference only, liquid roof waterproofing is quoted at SAR 8–25 per m², bitumen membrane at SAR 15–35 per m², spray foam at SAR 20–45 per m², and XPS boards at SAR 12–30 per m², but the right system is confirmed on the roof, not from the desk. Crack injection, where a crack is the problem, is quoted at SAR 40–120 per metre, and that figure too is only fixed once the crack has been measured.

For the technician, the useful information is the context. Record the roof's access route, the number and condition of drains and outlets, any previous coating and its age, and whether the roof is exposed or shaded by neighbouring structures. Note whether there is a rooftop water tank, since tank internal coating is quoted at SAR 25–60 per m², and whether the stairwell or bathroom below shows signs of moisture that may be linked to the roof. Photographs of ponding and cracks taken during a dry day and again after rain help the next visit compare conditions. Keeping these notes with the property record makes each periodic check faster and more accurate.

Preventive checks follow a written schedule instead of waiting for a fault.

Signs that call for roof waterproofing

The following signs are worth checking before they grow:

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

Where the problem usually comes from

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

Tools we use in Aljumum

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 — Aljumum

Questions from Aljumum

What we advise against

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

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.