Roof waterproofing for warehouses in Najran

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.. Main roads in or near Najran: Al Jarba Street.

The centre of Najran sits about 1309 m above sea level (SRTM open elevation data).

Does a warehouse roof in Najran really need waterproofing, and what does it cost? The centre of Najran sits about 1309 m above sea level, and owners here often ask whether a high, dry town still needs roof protection. The answer depends on the roof itself. Liquid roof waterproofing is priced at SAR 8–25 per m², while a bitumen membrane runs SAR 15–35 per m², and spray foam sits at SAR 20–45 per m². Each option suits a different roof condition, so the choice starts with an inspection rather than a fixed package.

The inspection begins with a walk across the full roof area to mark ponding spots, lifted edges, and any surface cracks. Cracks along the roof are often treated by crack injection, which is priced at SAR 40–120 per metre, so the assessor measures every crack in metres and records its position. The team then checks drainage outlets and the junctions where the roof meets walls, since these are common leak points. Where insulation is in question, XPS boards at SAR 12–30 per m² may be considered as part of the overall plan. Each finding is noted against the roof plan so the owner receives a clear picture of the work needed before any quote is finalised.

Before the visit, gather the building's basic details so the assessor can work efficiently. Have the total roof area in square metres ready, along with a list of any past leaks, repairs, or coatings applied to the roof. Note where water has been seen inside the warehouse, and clear access to the roof hatch or ladder so the team can reach every section safely. If there is a water tank on the roof, mention it, because tank internal coating is priced separately at SAR 25–60 per m². Having this information ready helps the visit cover the roof properly and lets you compare options on equal terms.

For warehouses, work is phased around operations and stored goods.

Signs that call for roof waterproofing

The following signs are worth checking before they grow:

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

Causes we see in the field

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

Tools and methods, and when we use them

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.

Facts and costs — Najran

Short answers for Najran

Mistakes that cost more

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

What you receive

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