Roof waterproofing in Najran: without breaking

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

Why roof waterproofing differs in Najran

Team note on Najran: 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 Najran sits about 1309 m above sea level (SRTM open elevation data).

Main roads in or near Najran: Al Jarba Street.

Will fixing my roof leak mean tearing up the whole terrace? In Najran, where the centre of the city sits about 1309 m above sea level (SRTM open elevation data), many owners assume that waterproofing is a messy, disruptive job. It does not have to be. Several methods suit existing roofs, and the right one depends on the surface and the cost you are prepared to pay. Liquid roof waterproofing typically runs SAR 8–25 per m², bitumen membrane SAR 15–35 per m², and XPS boards SAR 12–30 per m². Each option has different ground preparation needs, so the figures are a starting point rather than a final quote.

The inspection begins with a walk over the roof to find where water is actually getting in, which is often not where the stain appears inside. The surveyor looks for cracks, blistered sealant, ponding areas and failed joints. Where a crack is the cause, crack injection is usually priced at SAR 40–120 per metre, so the length of each defect matters. The surveyor will also check drainage outlets and upstands, and note whether the roof is accessible for work without disturbing finishes. Photographs and measurements are taken so that the quote reflects the real area, not an estimate from the street. Nothing is removed at this stage; the aim is simply to confirm the cause before any material is chosen.

Before the visit, clear the roof access and move any stored items, plant pots or solar equipment that sit on the surface. Note when the leak appears, whether after rain or during hot afternoons, since that timing helps the surveyor trace the path of water. Bring any previous waterproofing records, warranties or invoices, and mention any earlier repairs. Make sure someone can open the door to the roof at the agreed time and that the surveyor can reach the drainage points. Keeping the roof clear and the information ready means the inspection stays short, and you receive a clear, itemised proposal that matches the work your roof really needs.

The aim is to locate the cause with instruments first, so any opening is limited to one point.

When do you need roof waterproofing?

These are the signs most often linked to roof waterproofing:

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

Causes we see in the field

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

Tools and methods, and when we use them

How the work is done, step by step

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 Najran

Common questions about roof waterproofing in Najran

Mistakes that cost more

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

What you receive

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