Roof waterproofing in Aljumum: before buying or handover

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

Before we start: what we know about Aljumum

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).

Is roof waterproofing worth checking before you buy a home in Aljumum, or after handover? In short, yes, and the sooner the better. The centre of Aljumum sits about 200 m above sea level (SRTM open elevation data), so the area is not low-lying, but roofs still take the full force of sun and rain, and the cost of fixing a leak later can exceed the cost of a good coating now. Liquid roof waterproofing is typically priced at SAR 8–25 per m², bitumen membrane at SAR 15–35 per m², and XPS boards at SAR 12–30 per m². Knowing these ranges helps you judge whether a quote is reasonable before you agree to anything.

The inspection itself should follow a clear order. Start by walking the roof surface and noting any cracks, blisters, ponding areas, or sections where the old coating has lifted. Where cracks are found, record their length in metres, because crack injection is usually quoted at SAR 40–120 per metre. Check the upstands, parapets and drainage outlets, since these are the most common points of failure. Look at the same areas inside the building for staining on ceilings and walls. If the property has a water tank on the roof, examine its interior as well, since tank internal coating is usually quoted at SAR 25–60 per m². Ask the seller or handover team what treatment the roof has had, when it was done, and whether any warranty papers exist. Measure the roof area so you can compare quotes on the same basis.

Before the visit, gather the property documents, any previous maintenance records, and photographs of past leaks if you have them. Clear access to the roof, the stairwell and the water tank, and make sure the person inspecting knows which rooms have shown damp. Note the roof's approximate area so that the surveyor can give you figures per square metre. Ask for a written list of the proposed works, with each item measured and priced in the same units used above. This makes it easy to compare offers and to confirm that nothing has been left out before you sign for the property.

Before buying or taking over a property, an inspection gives you findings in writing before you sign.

Signs that call for roof waterproofing

These are the signs most often linked to roof waterproofing:

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

Causes we see in the field

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

Common questions about roof waterproofing in Aljumum

Common mistakes we see

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

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.