Roof waterproofing in Najran: for companies (annual contract)

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.

Roof leaks are the most common complaint on company buildings in Najran, and they usually start small: a hairline crack in an old screed, a blocked outlet that lets water pond, or a membrane that has lost its grip after years of heat. On a commercial roof, even a minor leak can spoil stock, damage ceilings and stop work on the floors below, so the first job is to find where water is actually getting through rather than simply covering the surface.

Najran's setting changes how we approach the work. The centre of the city sits about 1309 m above sea level, which means strong daytime sun on the roof surface followed by cooler nights, a combination that makes coatings expand and contract. For that reason, we look closely at how the existing layers are bonded before choosing a system. Liquid roof waterproofing, priced at SAR 8–25 per m², suits roofs that need a seamless finish and can be applied over prepared surfaces. Bitumen membrane, at SAR 15–35 per m², is a common option where a physical sheet gives extra protection. Where insulation is needed as well, XPS boards at SAR 12–30 per m² can be included in the same plan, and cracks are sealed first with crack injection at SAR 40–120 per metre.

Before the visit, ask for a written scope that lists the roof area in square metres, the number of drains and outlets, and any sections that have already leaked. Confirm whether the annual contract covers inspections after rain or only scheduled maintenance, and ask how repairs outside the agreed scope are priced. It also helps to share photographs of the ceiling damage and any drainage problems, so the inspection can focus on the cause rather than the symptoms. A clear plan agreed in advance keeps the building in service and the costs easy to follow across the year.

For companies, an annual contract sets the scope, the visit schedule and the reports in writing.

When do you need roof waterproofing?

If you notice one of these signs in Najran, it is a good moment to talk to the team:

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

Where the problem usually comes from

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

Tools we use in Najran

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.

Najran in facts and sources

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

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.