Roof waterproofing for apartments in Najran

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

Before we start: what we know about 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.

An apartment owner in Najran often notices the first signs of trouble on the roof: a damp patch on the top-floor ceiling after a rain, peeling paint in a corner, or a faint smell of moisture in the stairwell. Many owners in this situation wait, assuming the problem will settle on its own, and by the time the leak reaches the flat below, the repair has grown from a small patch into a larger job. For the owner of a shared building, the roof is not just a private concern, because water that gets in at the top affects every household beneath it.

The local setting matters here. The centre of Najran sits about 1309 m above sea level (SRTM open elevation data), which places the city well above the coastal plain and in a landscape of hills and wide open ground. For a roof, the practical lesson is that exposure to sun, dust and sudden downpours is the main concern, and that the surface must be kept sealed so water runs off rather than soaking in. Pricing for common roof options also varies widely, so it helps to know the range before asking for quotes. Liquid roof waterproofing is listed at SAR 8–25 per m², bitumen membrane at SAR 15–35 per m², and XPS boards at SAR 12–30 per m². Spray foam sits at SAR 20–45 per m², and epoxy coating at SAR 35–90 per m². If a crack is visible, crack injection is priced at SAR 40–120 per metre.

A sensible sequence starts with a walk over the roof and a check of the parapets, drains and any joints where the roof meets walls or the water tank. Mark every crack and blocked outlet, then clear loose sand and debris so the surface can be properly prepared. Next, repair the cracks by injection and clean out the drains so water has a clear route away. Choose the roof system that suits the budget and the surface, then apply it in dry weather and allow the full curing time before anyone walks on it. Finally, record the work, note the date, and schedule a light inspection each year, especially after the wettest months, so small faults are caught before they reach the ceilings below.

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

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

Where the problem usually comes from

• 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

The steps in order

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 — Najran

Short answers for Najran

What we advise against

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

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.