Roof waterproofing for apartments in Aljumum

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).

Picture a flat owner in a low apartment block who notices a damp patch spreading across the ceiling of the top floor after a few rainy days. The building is not new, the parapet looks worn, and the owner wants the leak stopped before it reaches the rooms below and damages the paint, the wiring and the neighbours' homes. Like many owners, they are not sure whether the problem is the roof surface, a cracked drain, or water rising up through the structure, so they start by asking what the work will cost and how long the building will be disrupted.

The local facts help set expectations. The centre of Aljumum sits about 200 m above sea level, which means the area is not a low-lying flood zone, but roofs here still face sun, heat and rain that can sit on flat surfaces. A roof that is exposed to strong sun for long periods can crack at the joints and at the edges, so it is worth checking the upstand and the drains as carefully as the open field of the roof. Owners should also remember that the price of roof work depends on the method chosen. Liquid roof waterproofing typically falls in the range of SAR 8–25 per m², bitumen membrane in the range of SAR 15–35 per m², and insulation boards such as XPS in the range of SAR 12–30 per m². Choosing between these depends on the condition of the existing surface and the access to the roof.

A practical sequence keeps the work orderly. First, have the roof inspected after rain to find the exact wet areas and any cracks, and measure the roof area in square metres so every quote compares like with like. Second, clear the drains and outlets and repair cracks, using crack injection where a line is open, priced at SAR 40–120 per metre. Third, choose the coating or membrane that suits the roof and get written prices per square metre. Fourth, apply the chosen system in dry weather, following the product's drying times, and check the edges and upstands closely. Finally, inspect the ceiling below after the next heavy rain and keep a record of the work for the building's future maintenance.

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

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

Causes we see in the field

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

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.

Quick comparison: facts and costs in Aljumum

Short answers for Aljumum

Mistakes that cost more

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

What you get after the work

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.