Roof waterproofing in Najran: cost & published offers

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.

Consider a homeowner in Najran whose villa has a flat concrete roof that has started to show damp patches on the ceiling after rain. Like many owners of this type of property, they want to know what roof waterproofing will cost before committing to any work, and they want to avoid paying for a job that does not address the real problem. Their roof is open to the weather, the sun and the seasonal storms that sweep the region, so the surface gradually loses its protection over time.

The centre of Najran sits about 1309 m above sea level, which means the city is far higher than the coastal plains, and its climate and exposure differ from those of lower-lying cities. For a roof owner, this altitude matters because the surface takes strong sun by day and can cool noticeably at night, and that repeated expansion and contraction stresses the joints and cracks where water finds its way in. The published offers for roof work reflect this reality. Liquid roof waterproofing is listed at SAR 8–25 per m², a common choice for flat roofs, while bitumen membrane sits at SAR 15–35 per m² and XPS boards at SAR 12–30 per m². Spray foam, at SAR 20–45 per m², is another option to weigh against the roof's condition and access.

A sensible approach begins with measuring the roof area in square metres so that the published ranges can be turned into a realistic budget. Next, inspect the surface for cracks and mark them, because crack injection is priced separately at SAR 40–120 per metre and may be needed before any coating goes on. Then compare at least two methods against the range you have measured, check that each quote states the square-metre rate clearly, and ask how drainage outlets and parapet edges will be treated. Finally, confirm the work schedule and the warranty terms in writing before work starts, so the chosen method is applied to the roof you actually have.

Prices shown on this page come from our own published price list for the city; the final price is set after inspection.

Signs that call for 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.

How we choose the tool in Najran

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 Najran

Questions from 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.